# Patent

## Title
Bleaching in conjunction with a lipophilic fluid cleaning regimen

## Abstract

The present invention relates to methods to treat fabrics with lipophilic fluid, a polar phase and bleach system. The present invention is also directed to compositions containing lipophilic fluid, a polar phase and a bleach system.

## Background
RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 10/308,493, filed on Dec. 3, 2002, now abandoned, which claims priority to U.S. Provisional Application Ser. No. 60/338,009 filed Dec. 6, 2001; and is a continuation-in-part of U.S. patent application Ser. No. 09/849,553, filed on May 4, 2001, now U.S. Pat. No. 6,706,677, which claims priority under Title 35, United States Code 119(e) from Provisional Application Ser. Nos. 60/209,250; 60/209,468; 60/209,443; and 60/209,444 all filed on Jun. 5, 2000; and 60/248,023, filed on Nov. 13, 2000.


FIELD OF THE INVENTION
The present invention relates to compositions and methods to treat fabrics with a lipophilic fluid and bleaching systems. The present invention is also directed to compositions containing a lipophilic fluid and bleaching systems.
BACKGROUND OF THE INVENTION
Conventional laundering techniques for the cleaning and treatment of fabric articles such as garments have long involved both traditional aqueous based washing and a technique commonly referred to as “dry cleaning”. Traditional aqueous based washing techniques have involved immersion of the fabric articles in a solution of water and detergent or soap products followed by rinsing and drying. However, such conventional immersion cleaning techniques have proven unsatisfactory on a wide range fabric articles that require special handling and/or cleaning methods due to fabric content, construction, etceteras, that is unsuitable for immersion in water.
Accordingly, the use of the laundering method of “dry cleaning” has been developed. Dry cleaning typically involves the use of non-aqueous, lipophilic fluids as the solvent or solution for cleaning. While the absence of water permits the cleaning of fabrics without the potential disastrous side effects water may present, these lipophilic fluids do not perform well on hydrophilic and/or combination soils.
Because these lipophilic fluids are typically used in “neat” form (i.e. they contain no additional additives), dry cleaners must often perform pre-treating and/or pre-spotting to remove tough soils from fabrics prior to the dry cleaning cycle. Further, nothing is typically added to boost “whiteness” or “brightness” in fabrics that are dry-cleaned as can be observed from “dingy” or “dull” fabrics returned from a dry cleaner. It would be desirable to add bleaching to the lipophilic fluid treatment regimen in order to increase the lipophilic fluids' brightening, whitening, and/or soil removal capability thereby reducing or eliminating the need for pre-treating and/or pre-spotting.
Many fabrics and textiles highly valued by the consumer (e.g., silk) are prone to undue damage when exposed to water in large quantities. For this reason garments made from such fabric and textiles must be dry cleaned. One limitation of dry cleaning is the difficulty with which many commonly encountered soils (stains) are removed. Solvent systems that contain oxidation technology (i.e., bleaching systems) for effectively decolorizing the soil are thus an improvement over current dry cleaning methods for removing such soil.
Accordingly, the need remains for bleach-containing care and treatment regimens for use with lipophilic fluid compositions. These regimens should be capable of delivering enhanced brightening, whitening, and/or soil removal.
SUMMARY OF THE INVENTION
This need is met by the present invention wherein bleach-containing care and treatment regimens and compositions for use with lipophilic fluid compositions are provided. These regimens and/or compositions are capable of delivering enhanced brightening, whitening, and/or soil removal.
The present invention is directed to a method for attaining improved fabric cleaning in a lipophilic fluid treatment regimen, wherein the method includes the steps of exposing the fabric to a lipophilic fluid and exposing the fabric to a bleach system.
The present invention is also directed to a composition for attaining improved fabric cleaning in a lipophilic fluid treatment regimen, wherein the composition includes a lipophilic fluid and a bleach system.
These and other aspects, features and advantages will become apparent to those of ordinary skill in the art from a reading of the following detailed description and the appended claims. All percentages, ratios and proportions herein are by weight, unless otherwise specified. All temperatures are in degrees Celsius (° C.) unless otherwise specified. All measurements are in SI units unless otherwise specified. All documents cited are in relevant part, incorporated herein by reference.


DETAILED DESCRIPTION OF THE INVENTION
Definitions
The term “fabrics” and “fabric” used herein is intended to mean any article that is customarily cleaned in a conventional laundry process or in a dry cleaning process. As such the term encompasses articles of clothing, linen, drapery, and clothing accessories. The term also encompasses other items made in whole or in part of fabric, such as tote bags, furniture covers, tarpaulins and the like.
The term “soil” means any undesirable substance on a fabric article that is desired to be removed. By the terms “water-based” or “hydrophilic” soils, it is meant that the soil comprised water at the time it first came in contact with the fabric article, or the soil retains a significant portion of water on the fabric article. Examples of water-based soils include, but are not limited to beverages, many food soils, water soluble dyes, bodily fluids such as sweat, urine or blood, outdoor soils such as grass stains and mud.
The term “bleach system” used herein is intended to mean any formulation that contains one or more bleaching agents. Nonlimiting examples of bleaching agents include bleaches, both oxygen and chlorine bleaches, preferably oxygen bleaches, bleach activators, organic peroxides, bleach catalysts, especially metal-containing bleach catalysts, bleach boosting compounds, bleach pre-cursors, such as sources of hydrogen peroxide, photobleaches, and bleaching enzymes.
The term “AvO” used herein is intended to mean “available oxygen” as determined by the standard iodometric method (as described for instance in Methoden der Organischen Chemie, Houben Weyl, 1953, Vol. 2, page 562, herein incorporated by reference), a suitable method to determine the available oxygen (AvO) content of a composition.
Furthermore, all adjunct ingredients such as surfactants, bleaches, and the like may be added either prior to fabric application (directly into the lipophilic fluid and/or polar phase and/or bleach system) or at some point during fabric application. These optional adjunct ingredients are described in more detail below.
The term “bleach system-containing composition” used herein are intended to mean any lipophilic fluid-containing/bleach system-containing composition that comes into direct contact with fabric articles to be cleaned.
The term “consumable bleach system-containing detergent composition” means any composition, that when combined with a lipophilic fluid, results in a bleach system-containing composition useful according to the present invention processes.
The term “mixing” as used herein means combining two or more materials (i.e., fluids, more specifically a lipophilic fluid and a consumable bleach system-containing detergent composition) in such a way that a homogeneous mixture is formed. Suitable mixing processes are known in the art. Nonlimiting examples of suitable mixing processes include vortex mixing processes and static mixing processes.
Water/Lipophilic Fluid System
As has been recognized herein, one aspect of the present invention is an embodiment wherein some level of water is present in conjunction with the lipophilic fluid for the bleaching system-containing compositions of the present invention, such that effective bleaching occurs. The level of water is typically ranges from about 0% to less than about 5%, in another embodiment less than about 2%, still in another embodiment less than about 1% by weight of the composition. The bleaching system, water and lipophilic fluid may come from different sources, but are present simultaneously when bleaching of a soil is desired.
When water, lipophilic fluid and a bleaching system are present, simultaneously, in the bleaching system-containing composition of the present invention, a partition between the lipophilic fluid and the water exists. It has surprisingly been found that there are three (3) embodiments that exist based upon this partition.
One embodiment is that the bleaching system is more soluble in water than in the lipophilic fluid. In this case, the bleaching system has a ClogP (partition coeffecient of lipophilic fluid/water) of less than 0. In other words, the bleaching system is more soluble in water than in the lipophilic fluid. To enhance the bleaching effect of such bleaching systems, the pH of the water should be alkaline, typically at least about 8, more typically at least about 9, even more typically at least about 10.
A second embodiment is that the bleaching system is substantially equally soluble in water as in the lipophilic fluid. In other words, the bleaching system has a ClogP of greater than or equal to −1 to about less than or equal to 1. To enhance the bleaching effect of such bleaching systems, the pH of the water should be alkaline, typically at least about 8, more typically at least about 9, even more typically at least about 10.
A third embodiment is where the bleaching system is more soluble in the lipophilic fluid than in the water. Such a bleaching system is not very effective since the bleaching system is not in equilibrium with its charged species.
Lipophilic Fluid
The lipophilic fluid herein is one having a liquid phase present under operating conditions of a fabric article treating appliance, in other words, during treatment of a fabric article in accordance with the present invention. In general such a lipophilic fluid can be fully liquid at ambient temperature and pressure, can be an easily melted solid, e.g., one which becomes liquid at temperatures in the range from about 0 deg. C. to about 60 deg. C., or can comprise a mixture of liquid and vapor phases at ambient temperatures and pressures, e.g., at 25 deg. C. and 1 atm. pressure. Thus, the lipophilic fluid is not a compressible gas such as carbon dioxide.
It is preferred that the lipophilic fluids herein be nonflammable or have relatively high flash points and/or low VOC (volatile organic compound) characteristics, these terms having their conventional meanings as used in the dry cleaning industry, to equal or, preferably, exceed the characteristics of known conventional dry cleaning fluids.
Moreover, suitable lipophilic fluids herein are readily flowable and nonviscous.
In general, lipophilic fluids herein are required to be fluids capable of at least partially dissolving sebum or body soil as defined in the test hereinafter. Mixtures of lipophilic fluid are also suitable, and provided that the requirements of the Lipophilic Fluid Test, as described below, are met, the lipophilic fluid can include any fraction of dry-cleaning solvents, especially newer types including fluorinated solvents, or perfluorinated amines. Some perfluorinated amines such as perfluorotributylamines while unsuitable for use as lipophilic fluid may be present as one of many possible adjuncts present in the lipophilic fluid-containing composition.
Other suitable lipophilic fluids include, but are not limited to, diol solvent systems e.g., higher diols such as C6- or C8- or higher diols, organosilicone solvents including both cyclic and acyclic types, and the like, and mixtures thereof.
A preferred group of nonaqueous lipophilic fluids suitable for incorporation as a major component of the compositions of the present invention include low-volatility nonfluorinated organics, silicones, especially those other than amino functional silicones, and mixtures thereof. Low volatility nonfluorinated organics include for example OLEAN® and other polyol esters, or certain relatively nonvolatile biodegradable mid-chain branched petroleum fractions.
Another preferred group of nonaqueous lipophilic fluids suitable for incorporation as a major component of the compositions of the present invention include, but are not limited to, glycol ethers, for example propylene glycol methyl ether, propylene glycol n-propyl ether, propylene glycol t-butyl ether, propylene glycol n-butyl ether, dipropylene glycol methyl ether, dipropylene glycol n-propyl ether, dipropylene glycol t-butyl ether, dipropylene glycol n-butyl ether, tripropylene glycol methyl ether, tripropylene glycol n-propyl ether, tripropylene glycol t-butyl ether, tripropylene glycol n-butyl ether. Suitable silicones for use as a major component, e.g., more than 50%, of the composition include cyclopentasiloxanes, sometimes termed “D5”, and/or linear analogs having approximately similar volatility, optionally complemented by other compatible silicones. Suitable silicones are well known in the literature, see, for example, Kirk Othmer's Encyclopedia of Chemical Technology, and are available from a number of commercial sources, including General Electric, Toshiba Silicone, Bayer, and Dow Corning. Other suitable lipophilic fluids are commercially available from Procter & Gamble or from Dow Chemical and other suppliers.
Qualification of Lipophilic Fluid and Lipophilic Fluid Test (LF Test)
Any nonaqueous fluid that is both capable of meeting known requirements for a dry-cleaning fluid (e.g, flash point etc.) and is capable of at least partially dissolving sebum, as indicated by the test method described below, is suitable as a lipophilic fluid herein. As a general guideline, perfluorobutylamine (Fluorinert FC-43®) on its own (with or without adjuncts) is a reference material which by definition is unsuitable as a lipophilic fluid for use herein (it is essentially a nonsolvent) while cyclopentasiloxanes have suitable sebum-dissolving properties and dissolves sebum.
The following is the method for investigating and qualifying other materials, e.g., other low-viscosity, free-flowing silicones, for use as the lipophilic fluid. The method uses commercially available Crisco® canola oil, oleic acid (95% pure, available from Sigma Aldrich Co.) and squalene (99% pure, available from J. T. Baker) as model soils for sebum. The test materials should be substantially anhydrous and free from any added adjuncts, or other materials during evaluation.
Prepare three vials, each vial will contain one type of lipophilic soil. Place 1.0 g of canola oil in the first; in a second vial place 1.0 g of the oleic acid (95%), and in a third and final vial place 1.0 g of the squalene (99.9%). To each vial add 1 g of the fluid to be tested for lipophilicity. Separately mix at room temperature and pressure each vial containing the lipophilic soil and the fluid to be tested for 20 seconds on a standard vortex mixer at maximum setting. Place vials on the bench and allow to settle for 15 minutes at room temperature and pressure. If, upon standing, a clear single phase is formed in any of the vials containing lipophilic soils, then the nonaqueous fluid qualifies as suitable for use as a “lipophilic fluid” in accordance with the present invention. However, if two or more separate layers are formed in all three vials, then the amount of nonaqueous fluid dissolved in the oil phase will need to be further determined before rejecting or accepting the nonaqueous fluid as qualified.
In such a case, with a syringe, carefully extract a 200-microliter sample from each layer in each vial. The syringe-extracted layer samples are placed in GC auto sampler vials and subjected to conventional GC analysis after determining the retention time of calibration samples of each of the three models soils and the fluid being tested. If more than 1% of the test fluid by GC, preferably greater, is found to be present in any one of the layers which consists of the oleic acid, canola oil or squalene layer, then the test fluid is also qualified for use as a lipophilic fluid. If needed, the method can be further calibrated using heptacosafluorotributylamine, i.e., Fluorinert FC-43 (fail) and cyclopentasiloxane (pass). A suitable GC is a Hewlett Packard Gas Chromatograph HP5890 Series II equipped with a split/splitless injector and FID. A suitable column used in determining the amount of lipophilic fluid present is a J&W Scientific capillary column DB-1HT, 30 meter, 0.25 mm id, 0.1 um film thickness cat# 1221131. The GC is suitably operated under the following conditions:
Carrier Gas: Hydrogen
Column Head Pressure: 9 psi
Flows: Column Flow @ ̃1.5 ml/min.

    
    
        Split Vent @ ̃250-500 ml/min.
        Septum Purge @1 ml/min.
    
    


Injection: HP 7673 Autosampler, 10 ul syringe, 1 ul injection
Injector Temperature: 350° C.
Detector Temperature: 380° C.
Oven Temperature Program: initial 60° C. hold 1 min.

    
    
        rate 25° C./min.
        final 380° C. hold 30 min.
    
    


Preferred lipophilic fluids suitable for use herein can further be qualified for use on the basis of having an excellent garment care profile. Garment care profile testing is well known in the art and involves testing a fluid to be qualified using a wide range of garment or fabric article components, including fabrics, threads and elastics used in seams, etc., and a range of buttons. Preferred lipophilic fluids for use herein have an excellent garment care profile, for example they have a good shrinkage and/or fabric puckering profile and do not appreciably damage plastic buttons. Certain materials which in sebum removal qualify for use as lipophilic fluids, for example ethyl lactate, can be quite objectionable in their tendency to dissolve buttons, and if such a material is to be used in the compositions of the present invention, it will be formulated with water and/or other solvents such that the overall mix is not substantially damaging to buttons. Other lipophilic fluids, D5, for example, meet the garment care requirements quite admirably. Some suitable lipophilic fluids may be found in granted U.S. Pat. Nos. 5,865,852; 5,942,007; 6,042,617; 6,042,618; 6,056,789; 6,059,845; and 6,063,135, which are incorporated herein by reference.
Lipophilic fluids can include linear and cyclic polysiloxanes, hydrocarbons and chlorinated hydrocarbons, with the exception of PERC and DF2000 which are explicitly not covered by the lipophilic fluid definition as used herein. More preferred are the linear and cyclic polysiloxanes and hydrocarbons of the glycol ether, acetate ester, lactate ester families. Preferred lipophilic fluids include cyclic siloxanes having a boiling point at 760 mm Hg. of below about 250° C. Specifically preferred cyclic siloxanes for use in this invention are octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. Preferably, the cyclic siloxane comprises decamethylcyclopentasiloxane (D5, pentamer) and is substantially free of octamethylcyclotetrasiloxane (tetramer) and dodecamethylcyclohexasiloxane (hexamer).
However, it should be understood that useful cyclic siloxane mixtures might contain, in addition to the preferred cyclic siloxanes, minor amounts of other cyclic siloxanes including octamethylcyclotetrasiloxane and hexamethylcyclotrisiloxane or higher cyclics such as tetradecamethylcycloheptasiloxane. Generally the amount of these other cyclic siloxanes in useful cyclic siloxane mixtures will be less than about 10 percent based on the total weight of the mixture. The industry standard for cyclic siloxane mixtures is that such mixtures comprise less than about 1% by weight of the mixture of octamethylcyclotetrasiloxane.
Accordingly, the lipophilic fluid of the present invention preferably comprises more than about 50%, more preferably more than about 75%, even more preferably at least about 90%, most preferably at least about 95% by weight of the lipophilic fluid of decamethylcyclopentasiloxane. Alternatively, the lipophilic fluid may comprise siloxanes which are a mixture of cyclic siloxanes having more than about 50%, preferably more than about 75%, more preferably at least about 90%, most preferably at least about 95% up to about 100% by weight of the mixture of decamethylcyclopentasiloxane and less than about 10%, preferably less than about 5%, more preferably less than about 2%, even more preferably less than about 1%, most preferably less than about 0.5% to about 0% by weight of the mixture of octamethylcyclotetrasiloxane and/or dodecamethylcyclohexasiloxane.
The level of lipophilic fluid present in the bleach system-containing compositions according to the present invention may be from about 70% to about 99.99% and/or from about 90% to about 99.9% and/or from about 95% to about 99.8% by weight of the cleaning composition. The level of lipophilic fluid, when present in a consumable bleach system-containing detergent composition useful for the present invention, may be from about 0% to about 90% and/or from about 0.1% to about 75% and/or from about 1% to about 50% by weight of the consumable bleach system-containing detergent composition.
Bleaching System
The compositions of the present invention comprise a bleaching system. Bleaching systems typically comprise a “bleaching agent” (source of hydrogen peroxide) in conjunction with an “activator” or “catalyst” if needed.
When present, bleaching agents will typically be at levels of from about 0.005%, preferably from about 0.05% to about 3.0%, preferably to about 2.0% by weight, of the composition comprising a lipophilic fluid and a bleach system. If present, the amount of bleach activator will typically be from about 0.1%, preferably from about 0.5% to about 60%, preferably to about 40% by weight, of the bleaching composition comprising the bleaching agent-plus-bleach activator.
Bleaching Agents—Hydrogen peroxide sources are described in detail in the herein incorporated Kirk Othmer's Encyclopedia of Chemical Technology, 4th Ed (1992, John Wiley & Sons), Vol. 4, pp. 271-300 “Bleaching Agents (Survey)”, and include the various forms of sodium perborate and sodium percarbonate, including various coated and modified forms.
The preferred source of hydrogen peroxide used herein can be any convenient source, including hydrogen peroxide itself. For example, perborate, e.g., sodium perborate (any hydrate but preferably the mono- or tetra-hydrate), sodium carbonate peroxyhydrate or equivalent percarbonate salts, sodium pyrophosphate peroxyhydrate, urea peroxyhydrate, or sodium peroxide can be used herein. Also useful are sources of available oxygen such as persulfate bleach (e.g., OXONE, manufactured by DuPont). Sodium perborate monohydrate and sodium percarbonate are particularly preferred. Mixtures of any convenient hydrogen peroxide sources can also be used.
A preferred percarbonate bleach comprises dry particles having an average particle size in the range from about 500 micrometers to about 1,000 micrometers, not more than about 10% by weight of said particles being smaller than about 200 micrometers and not more than about 10% by weight of said particles being larger than about 1,250 micrometers. Optionally, the percarbonate can be coated with a silicate, borate or water-soluble surfactants. Percarbonate is available from various commercial sources such as FMC, Solvay and Tokai Denka.
Compositions of the present invention may also comprise as the bleaching agent a chlorine-type bleaching material. Such agents are well known in the art, and include for example sodium dichloroisocyanurate (“NaDCC”). However, chlorine-type bleaches are less preferred for compositions which comprise enzymes.
(a) Bleach Activators—Preferably, the peroxygen bleach component in the composition is formulated with an activator (peracid precursor). The activator is present at levels of from about 0.01%, preferably from about 0.5%, more preferably from about 1% to about 15%, preferably to about 10%, more preferably to about 8%, by weight of the composition. A bleach activator as used herein is any compound which when used in conjunction with a hydrogen peroxide source leads to the in situ production of the peracid corresponding to the bleach activator. Various non limiting examples of activators are fully disclosed in U.S. Pat. No. 5,576,282, U.S. Pat. No. 4,915,854 and U.S. Pat. No. 4,412,934. See also U.S. Pat. No. 4,634,551 for other typical bleaches and activators useful herein.
Preferred activators are selected from the group consisting of tetraacetyl ethylene diamine (TAED), benzoylcaprolactam (BzCL), 4-nitrobenzoylcaprolactam, 3-chlorobenzoylcaprolactam, benzoyloxybenzenesulphonate (BOBS), nonanoyloxybenzene-sulphonate (NOBS), phenyl benzoate (PhBz), decanoyloxybenzenesulphonate (C10-OBS), benzoylvalerolactam (BZVL), octanoyloxybenzenesulphonate (C8-OBS), perhydrolyzable esters and mixtures thereof, most preferably benzoylcaprolactam and benzoylvalerolactam. Particularly preferred bleach activators in the pH range from about 8 to about 11 are those selected having an OBS or VL leaving group.
Preferred hydrophobic bleach activators include, but are not limited to, nonanoyloxybenzenesulphonate (NOBS), 4-[N-(nonaoyl) amino hexanoyloxy]-benzene sulfonate sodium salt (NACA-OBS) an example of which is described in U.S. Pat. No. 5,523,434, dodecanoyloxybenzenesulphonate (LOBS or C12-OBS), 10-undecenoyloxybenzenesulfonate (UDOBS or C11-OBS with unsaturation in the 10 position), and decanoyloxybenzoic acid (DOBA).
Preferred bleach activators are those described in U.S. Pat. No. 5,698,504 Christie et al., issued Dec. 16, 1997; U.S. Pat. No. 5,695,679 Christie et al. issued Dec. 9, 1997; U.S. Pat. No. 5,686,401 Willey et al., issued Nov. 11, 1997; U.S. Pat. No. 5,686,014 Hartshorn et al., issued Nov. 11, 1997; U.S. Pat. No. 5,405,412 Willey et al., issued Apr. 11, 1995; U.S. Pat. No. 5,405,413 Willey et al., issued Apr. 11, 1995; U.S. Pat. No. 5,130,045 Mitchel et al., issued Jul. 14, 1992; and U.S. Pat. No. 4,412,934 Chung et al., issued Nov. 1, 1983, and copending patent applications U.S. Ser. Nos. 08/709,072, 08/064,564, all of which are incorporated herein by reference.
The mole ratio of peroxygen source (as AvO) to bleach activator in the present invention generally ranges from at least 1:1, preferably from about 20:1, more preferably from about 10:1 to about 1:1, preferably to about 3:1.
Quaternary substituted bleach activators may also be included. The present laundry compositions preferably comprise a quaternary substituted bleach activator (QSBA) or a quaternary substituted peracid (QSP, preferably a quaternary substituted percarboxylic acid or a quaternary substituted peroxyimidic acid); more preferably, the former. Preferred QSBA structures are further described in U.S. Pat. No. 5,686,015 Willey et al., issued Nov. 11, 1997; U.S. Pat. No. 5,654,421 Taylor et al., issued Aug. 5, 1997; U.S. Pat. No. 5,460,747 Gosselink et al., issued Oct. 24, 1995; U.S. Pat. No. 5,584,888 Miracle et al., issued Dec. 17, 1996; U.S. Pat. No. 5,578,136 Taylor et al., issued Nov. 26, 1996; Usxxx; all of which are incorporated herein by reference.

    Highly preferred bleach activators useful herein are amide-substituted as described in U.S. Pat. No. 5,698,504, U.S. Pat. No. 5,695,679, and U.S. Pat. No. 5,686,014 each of which are cited herein above. Preferred examples of such bleach activators include: (6-octanamidocaproyl)oxybenzenesulfonate, (6-nonanamidocaproyl) oxybenzenesulfonate, (6-decanamidocaproyl)oxybenzenesulfonate and mixtures thereof.


Other useful activators, disclosed in U.S. Pat. No. 5,698,504, U.S. Pat. No. 5,695,679, U.S. Pat. No. 5,686,014 each of which is cited herein above and U.S. Pat. No. 4,966,723 Hodge et al., issued Oct. 30, 1990, include benzoxazin-type activators, such as a C6H4 ring to which is fused in the 1,2-positions a moiety—C(O)OC(R1)═N—.
Nitriles, such as acetonitriles and/or ammonium nitrites and other quaternary nitrogen containing nitriles, are another class of activators that are useful herein. Nonlimiting examples of such nitrile bleach activators are described in U.S. Pat. Nos. 6,133,216, 3,986,972, 6,063,750, 6,017,464, 5,958,289, 5,877,315, 5,741,437, 5,739,327, 5,004,558; EP Nos. 790 244, 775 127, 1 017 773, 1 017 776; and WO 99/14302, WO 99/14296, WO96/40661, all of which are incorporated herein by reference.
Depending on the activator and precise application, good bleaching results can be obtained from bleaching systems having an in-use pH of from about 6 to about 13, preferably from about 9.0 to about 10.5. Typically, for example, activators with electron-withdrawing moieties are used for near-neutral or sub-neutral pH ranges. Alkalis and buffering agents can be used to secure such pH.
Acyl lactam activators, as described in U.S. Pat. No. 5,698,504, U.S. Pat. No. 5,695,679 and U.S. Pat. No. 5,686,014, each of which is cited herein above, are very useful herein, especially the acyl caprolactams (see for example WO 94-28102 A) and acyl valerolactams (see U.S. Pat. No. 5,503,639 Willey et al., issued Apr. 2, 1996 incorporated herein by reference).
(b) Organic Peroxides, especially Diacyl Peroxides—These are extensively illustrated in Kirk Othmer, Encyclopedia of Chemical Technology, Vol. 17, John Wiley and Sons, 1982 at pages 27-90 and especially at pages 63-72, all incorporated herein by reference. If a diacyl peroxide is used, it will preferably be one which exerts minimal adverse impact on fabric care, including color care.
(c) Metal-containing Bleach Catalysts—The compositions and methods of the present invention can also optionally include metal-containing bleach catalysts, preferably manganese and cobalt-containing bleach catalysts.
One type of metal-containing bleach catalyst is a catalyst system comprising a transition metal cation of defined bleach catalytic activity, such as copper, iron, titanium, ruthenium tungsten, molybdenum, or manganese cations, an auxiliary metal cation having little or no bleach catalytic activity, such as zinc or aluminum cations, and a sequestrate having defined stability constants for the catalytic and auxiliary metal cations, particularly ethylenediaminetetraacetic acid, ethylenediaminetetra (methylenephosphonic acid) and water-soluble salts thereof. Such catalysts are disclosed in U.S. Pat. No. 4,430,243 Bragg, issued Feb. 2, 1982.
Manganese Metal Complexes—If desired, the compositions herein can be catalyzed by means of a manganese compound. Such compounds and levels of use are well known in the art and include, for example, the manganese-based catalysts disclosed in U.S. Pat. Nos. 5,576,282; 5,246,621; 5,244,594; 5,194,416; and 5,114,606; and European Pat. App. Pub. Nos. 549,271 A1, 549,272 A1, 544,440 A2, and 544,490 A1; Preferred examples of these catalysts include MnIV2(u-O)3(1,4,7-trimethyl-1,4,7-triazacyclononane)2(PF6)2, MnIII2(u-O)1(u-OAc)2(1,4,7-trimethyl-1,4,7-triazacyclononane)2(ClO4)2, MnIV4(u-O)6(1,4,7-triazacyclononane)4(ClO4)4, MnIII-MnIV4(u-O)1(u-OAc)2-(1,4,7-trimethyl-1,4,7-triazacyclononane)2(ClO4)3, MnIV(1,4,7-trimethyl-1,4,7-triazacyclononane)-(OCH3)3(PF6), and mixtures thereof. Other metal-based bleach catalysts include those disclosed in U.S. Pat. Nos. 4,430,243 and U.S. Pat. No. 5,114,611. The use of manganese with various complex ligands to enhance bleaching is also reported in the following: U.S. Pat. Nos. 4,728,455; 5,284,944; 5,246,612; 5,256,779; 5,280,117; 5,274,147; 5,153,161; and 5,227,084.
Cobalt Metal Complexes—Cobalt bleach catalysts useful herein are known, and are described, for example, in U.S. Pat. Nos. 5,597,936; 5,595,967; and 5,703,030; and M. L. Tobe, “Base Hydrolysis of Transition-Metal Complexes”, Adv. Inorg. Bioinorg. Mech., (1983), 2, pages 1-94. The most preferred cobalt catalyst useful herein are cobalt pentaamine acetate salts having the formula [Co(NH3)5OAc] Ty, wherein “OAc” represents an acetate moiety and “Ty” is an anion, and especially cobalt pentaamine acetate chloride, [Co(NH3)5OAc]Cl2; as well as [Co(NH3)5OAc](OAc)2; [Co(NH3)5OAc](PF6)2; [Co(NH3)5OAc](SO4); [Co(NH3)5OAc](BF4)2; and [Co(NH3)5OAc](NO3)2 (herein “PAC”).
Iron Metal Complexes—Iron bleach catalysts useful herein are known, and include, but are not limited to, those described, for example, in
These cobalt catalysts are readily prepared by known procedures, such as taught for example in U.S. Pat. Nos. 6,302,921, 6,287,580, 6,140,294, 5,597,936; 5,595,967; and 5,703,030; in the Tobe article and the references cited therein; and in U.S. Pat. No. 4,810,410; J. Chem. Ed. (1989), 66 (12), 1043-45; The Synthesis and Characterization of Inorganic Compounds, W. L. Jolly (Prentice-Hall; 1970), pp. 461-3; Inorg. Chem., 18, 1497-1502 (1979); Inorg. Chem., 21, 2881-2885 (1982); Inorg. Chem., 18, 2023-2025 (1979); Inorg. Synthesis, 173-176 (1960); and Journal of Physical Chemistry, 56, 22-25 (1952).
Transition Metal Complexes of Macropolycyclic Rigid Ligands—Compositions herein may also suitably include as bleach catalyst a transition metal complex of a macropolycyclic rigid ligand. The amount used is a catalytically effective amount, suitably about 1 ppb or more, for example up to about 99.9%, more typically about 0.001 ppm or more, preferably from about 0.05 ppm to about 500 ppm (wherein “ppb” denotes parts per billion by weight and “ppm” denotes parts per million by weight).
Transition-metal bleach catalysts of Macrocyclic Rigid Ligands which are suitable for use in the invention compositions can in general include known compounds where they conform with the definition herein, as well as, more preferably, any of a large number of novel compounds expressly designed for the present laundry or laundry uses, and non-limitingly illustrated by any of the following:
Dichloro-5,12-dimethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecane Manganese(II)
Dichloro-5,12-diethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecane Manganese(II)
Diaquo-5,12-dimethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecaneManganese(II) Hexafluorophosphate
Diaquo-5,12-diethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecaneManganese(II) Hexafluorophosphate
Aquo-hydroxy-5,12-dimethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecane Manganese(III) Hexafluorophosphate
Diaquo-5,12-dimethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecaneManganese(III) Tetrafluoroborate
Dichloro-5,12-dimethyl-1,5,8,12 tetraazabicyclo[6.6.2]hexadecane Manganese(III) Hexafluorophosphate
Dichloro-5,12-diethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecaneManganese(III) Hexafluorophosphate
Dichloro-5,12-di-n-butyl-1,5,8,12-tetraaza bicyclo[6.6.2]hexadecane Manganese(II)
Dichloro-5,12-dibenzyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecaneManganese(II)
Dichloro-5-n-butyl-12-methyl-1,5,8,12-tetraaza-bicyclo[6.6.2]hexadecane Manganese(II)
Dichloro-5-n-octyl-12-methyl-1,5,8,12-tetraaza-bicyclo[6.6.2]hexadecane Manganese(II)
Dichloro-5-n-butyl-12-methyl-1,5,8,12-tetraaza-bicyclo[6.6.2]hexadecane Manganese(II).
As a practical matter, and not by way of limitation, the compositions and methods herein can be adjusted to provide on the order of at least one part per hundred million of the active bleach catalyst species in the composition comprising a lipophilic fluid and a bleach system, and will preferably provide from about 0.01 ppm to about 25 ppm, more preferably from about 0.05 ppm to about 10 ppm, and most preferably from about 0.1 ppm to about 5 ppm, of the bleach catalyst species in the composition comprising a lipophilic fluid and a bleach system.
(d) Bleach Boosting Compounds—The compositions herein may comprise one or more bleach boosting compounds. Bleach boosting compounds provide increased bleaching effectiveness in lower temperature applications. The bleach boosters act in conjunction with conventional peroxygen bleaching sources to provide increased bleaching effectiveness. This is normally accomplished through in situ formation of an active oxygen transfer agent such as a dioxirane, an oxaziridine, or an oxaziridinium. Alternatively, preformed dioxiranes, oxaziridines and oxaziridiniums may be used.
Among suitable bleach boosting compounds for use in accordance with the present invention are cationic imines, zwitterionic imines, anionic imines and/or polyionic imines having a net charge of from about +3 to about −3, and mixtures thereof. These imine bleach boosting compounds of the present invention include those of the general structure:




where R1-R4 may be a hydrogen or an unsubstituted or substituted radical selected from the group consisting of phenyl, aryl, heterocyclic ring, alkyl and cycloalkyl radicals.
Among preferred bleach boosting compounds are zwitterionic bleach boosters, which are described in U.S. Pat. Nos. 5,576,282 and 5,718,614. Other bleach boosting compounds include cationic bleach boosters described in U.S. Pat. Nos. 5,360,569, 5,442,066, 5,478,357, 5,370,826, 5,482,515, 5,550,256, and WO 95/13351, WO 95/13352, and WO 95/13353.
Peroxygen sources are well-known in the art and the peroxygen source employed in the present invention may comprise any of these well known sources, including peroxygen compounds as well as compounds which under consumer use conditions provide an effective amount of peroxygen in situ. The peroxygen source may include a hydrogen peroxide source, the in situ formation of a peracid anion through the reaction of a hydrogen peroxide source and a bleach activator, preformed peracid compounds or mixtures of suitable peroxygen sources. Of course, one of ordinary skill in the art will recognize that other sources of peroxygen may be employed without departing from the scope of the invention.
The bleach boosting compounds, when present, are preferably employed in conjunction with a peroxygen source in the bleaching systems of the present invention.
(e) Preformed Peracids—Also suitable as bleaching agents are preformed peracids. The preformed peracid compound as used herein is any convenient compound which is stable and which under consumer use conditions provides an effective amount of peracid or peracid anion. The preformed peracid compound may be selected from the group consisting of percarboxylic acids and salts, percarbonic acids and salts, perimidic acids and salts, peroxymonosulfuric acids and salts, and mixtures thereof, examples of which are described in U.S. Pat. No. 5,576,282 to Miracle et al.
One class of suitable organic peroxycarboxylic acids have the general formula:




wherein R is an alkylene or substituted alkylene group containing from 1 to about 22 carbon atoms or a phenylene or substituted phenylene group, and Y is hydrogen, halogen, alkyl, aryl, —C(O)OH or —C(O)OOH.

Organic peroxyacids suitable for use in the present invention can contain either one or two peroxy groups and can be either aliphatic or aromatic. When the organic peroxycarboxylic acid is aliphatic, the unsubstituted peracid has the general formula:




where Y can be, for example, H, CH3, CH2Cl, C(O)OH, or C(O)OOH; and n is an integer from 0 to 20. When the organic peroxycarboxylic acid is aromatic, the unsubstituted peracid has the general formula:





wherein Y can be, for example, hydrogen, alkyl, alkylhalogen, halogen, C(O)OH or C(O)OOH.

Typical monoperoxy acids useful herein include alkyl and aryl peroxyacids such as:

    
    
        (i) peroxybenzoic acid and ring-substituted peroxybenzoic acid, e.g. peroxy-a-naphthoic acid, monoperoxyphthalic acid (magnesium salt hexahydrate), and o-carboxybenzamidoperoxyhexanoic acid (sodium salt);
        (ii) aliphatic, substituted aliphatic and arylalkyl monoperoxy acids, e.g. peroxylauric acid, peroxystearic acid, N-nonanoylaminoperoxycaproic acid (NAPCA), N,N-(3-octylsuccinoyl)aminoperoxycaproic acid (SAPA) and N,N-phthaloylaminoperoxycaproic acid (PAP);
        (iii) amidoperoxyacids, e.g. monononylamide of either peroxysuccinic acid (NAPSA) or of peroxyadipic acid (NAPAA).
    
    


Typical diperoxyacids useful herein include alkyl diperoxyacids and aryldiperoxyacids, such as:

    
    
        (iv) 1,12-diperoxydodecanedioic acid;
        (v) 1,9-diperoxyazelaic acid;
        (vi) diperoxybrassylic acid; diperoxysebacic acid and diperoxyisophthalic acid;
        (vii) 2-decyldiperoxybutane-1,4-dioic acid;
        (viii) 4,4′-sulfonylbisperoxybenzoic acid.
    
    


Such bleaching agents are disclosed in U.S. Pat. No. 4,483,781, Hartman, issued Nov. 20, 1984, U.S. Pat. No. 4,634,551 to Burns et al., European Patent Application 0,133,354, Banks et al. published Feb. 20, 1985, and U.S. Pat. No. 4,412,934, Chung et al. issued Nov. 1, 1983. Sources also include 6-nonylamino-6-oxoperoxycaproic acid as fully described in U.S. Pat. No. 4,634,551, issued Jan. 6, 1987 to Burns et al. Persulfate compounds such as for example OXONE, manufactured commercially by E.I. DuPont de Nemours of Wilmington, Del. can also be employed as a suitable source of peroxymonosulfuric acid. PAP is disclosed in, for example, U.S. Pat. Nos. 5,487,818, 5,310,934, 5,246,620, 5,279,757 and 5,132,431.
(f) Photobleaches—Suitable photobleaches for use in the treating compositions of the present invention include, but are not limited to, the photobleaches described in U.S. Pat. Nos. 4,217,105 and 5,916,481.
(g) Enzyme Bleaching—Enzymatic systems may be used as bleaching agents. The hydrogen peroxide may also be present by adding an enzymatic system (i.e. an enzyme and a substrate therefore) which is capable of generating hydrogen peroxide at the beginning or during the washing and/or rinsing process. Such enzymatic systems are disclosed in EP Patent Application 91202655.6 filed Oct. 9, 1991.
The present invention compositions and methods may utilize alternative bleach systems such as ozone, chlorine dioxide and the like. Bleaching with ozone may be accomplished by introducing ozone-containing gas having ozone content from about 20 to about 300 g/m3 into the solution that is to contact the fabrics. The gas:liquid ratio in the solution should be maintained from about 1:2.5 to about 1:6. U.S. Pat. No. 5,346,588 describes a process for the utilization of ozone as an alternative to conventional bleach systems and is herein incorporated by reference.
Adjunct Ingredients
Adjunct materials can vary widely and can be used at widely ranging levels. For example, detersive enzymes such as proteases, amylases, cellulases, lipases and the like as well as bleach catalysts including the macrocyclic types having manganese or similar transition metals all useful in laundry and cleaning products can be used herein at very low, or less commonly, higher levels. Adjunct materials that are catalytic, for example enzymes, can be used in “forward” or “reverse” modes, a discovery independently useful from the specific appliances of the present invention. For example, a lipolase or other hydrolase may be used, optionally in the presence of alcohols as adjuncts, to convert fatty acids to esters, thereby increasing their solubility in the lipophilic fluid. This is a “reverse” operation, in contrast with the normal use of this hydrolase in water to convert a less water-soluble fatty ester to a more water-soluble material. In any event, any adjunct ingredient must be suitable for use in combination with the lipophilic fluid.
The compositions may comprise emulsifiers. Emulsifiers are well known in the chemical art. Essentially, an emulsifier acts to bring two or more insoluble or semi-soluble phases together to create a stable or semi-stable emulsion. It is preferred in the claimed invention that the emulsifier serves a dual purpose wherein it is capable of acting not only as an emulsifier but also as a treatment performance booster. For example, the emulsifier may also act as a surfactant thereby boosting cleaning performance. Both ordinary emulsifiers and emulsifier/surfactants are commercially available.
Some suitable cleaning additives include, but are not limited to, builders, surfactants, enzymes, bleach activators, bleach catalysts, bleach boosters, bleaches, alkalinity sources, antibacterial agents, colorants, perfumes, pro-perfumes, finishing aids, lime soap dispersants, composition malodor control agents, odor neutralizers, polymeric dye transfer inhibiting agents, crystal growth inhibitors, photobleaches, heavy metal ion sequestrants, anti-tarnishing agents, anti-microbial agents, anti-oxidants, anti-redeposition agents, soil release polymers, electrolytes, pH modifiers, thickeners, abrasives, divalent or trivalent ions, metal ion salts, enzyme stabilizers, corrosion inhibitors, diamines or polyamines and/or their alkoxylates, suds stabilizing polymers, solvents, process aids, fabric softening agents, optical brighteners, hydrotropes, suds or foam suppressors, suds or foam boosters, fabric softeners, antistatic agents, dye fixatives, dye abrasion inhibitors, anti-crocking agents, wrinkle reduction agents, wrinkle resistance agents, soil release polymers, soil repellency agents, sunscreen agents, anti-fade agents, and mixtures thereof.
The term “surfactant” conventionally refers to materials that are surface-active either in the water, the lipophilic fluid, or the mixture of the two. Some illustrative surfactants include nonionic, cationic and silicone surfactants as used in conventional aqueous detergent systems. Suitable nonionic surfactants include, but are not limited to:

    
    
        a) Polyethylene oxide condensates of nonyl phenol and myristyl alcohol, such as in U.S. Pat. No. 4,685,930 Kasprzak; and
        b) fatty alcohol ethoxylates, R—(OCH2CH2)aOH a=1 to 100, typically 12-40, R=hydrocarbon residue 8 to 20 C atoms, typically linear alkyl. Examples polyoxyethylene lauryl ether, with 4 or 23 oxyethylene groups; polyoxyethylene cetyl ether with 2, 10 or 20 oxyethylene groups; polyoxyethylene stearyl ether, with 2, 10, 20, 21 or 100 oxyethylene groups; polyoxyethylene (2), (10) oleyl ether, with 2 or 10 oxyethylene groups. Commercially available examples include, but are not limited to: ALFONIC, BRIJ, GENAPOL, NEODOL, SURFONIC, TRYCOL. See also U.S. Pat. No. 6,013,683 Hill et al.,

Suitable cationic surfactants include, but are not limited to dialkyldimethylammonium salts having the formula:

R′R′′N+(CH3)2X−

Where each R′R′′ is independently selected from the group consisting of 12-30 C atoms or derived from tallow, coconut oil or soy, X=Cl or Br, Examples include: didodecyldimethylammonium bromide (DDAB), dihexadecyldimethyl ammonium chloride, dihexadecyldimethyl ammonium bromide, dioctadecyldimethyl ammonium chloride, dieicosyldimethyl ammonium chloride, didocosyldimethyl ammonium chloride, dicoconutdimethyl ammonium chloride, ditallowdimethyl ammonium bromide (DTAB). Commercially available examples include, but are not limited to: ADOGEN, ARQUAD, TOMAH, VARIQUAT. See also U.S. Pat. No. 6,013,683 Hill et al.,

    
    


Suitable silicone surfactants include, but are not limited to the polyalkyleneoxide polysiloxanes having a dimethyl polysiloxane hydrophobic moiety and one or more hydrophilic polyalkylene side chains and have the general formula:

R1—(CH3)2SiO—[(CH3)2SiO]a—[(CH3)(R1)SiO]b—Si(CH3)2—R1

wherein a+b are from about 1 to about 50, preferably from about 3 to about 30, more preferably from about 10 to about 25, and each R1 is the same or different and is selected from the group consisting of methyl and a poly(ethyleneoxide/propyleneoxide) copolymer group having the general formula:

—(CH2)nO(C2H4O)c(C3H6O)dR2

with at least one R1 being a poly(ethyleneoxide/propyleneoxide) copolymer group, and wherein n is 3 or 4, preferably 3; total c (for all polyalkyleneoxy side groups) has a value of from 1 to about 100, preferably from about 6 to about 100; total d is from 0 to about 14, preferably from 0 to about 3; and more preferably d is 0; total c+d has a value of from about 5 to about 150, preferably from about 9 to about 100 and each R2 is the same or different and is selected from the group consisting of hydrogen, an alkyl having 1 to 4 carbon atoms, and an acetyl group, preferably hydrogen and methyl group. Examples of these surfactants may be found in U.S. Pat. No. 5,705,562 Hill and U.S. Pat. No. 5,707,613 Hill, both of which are incorporated herein by reference.

Examples of this type of surfactants are the Silwet® surfactants which are available CK Witco, OSi Division, Danbury, Conn. Representative Silwet surfactants are as follows.
















Name
Average MW
Average a + b
Average total c





















L-7608
600
1
9



L-7607
1,000
2
17



L-77
600
1
9



L-7605
6,000
20
99



L-7604
4,000
21
53



L-7600
4,000
11
68



L-7657
5,000
20
76



L-7602
3,000
20
29










The molecular weight of the polyalkyleneoxy group (R1) is less than or equal to about 10,000. Preferably, the molecular weight of the polyalkyleneoxy group is less than or equal to about 8,000, and most preferably ranges from about 300 to about 5,000. Thus, the values of c and d can be those numbers which provide molecular weights within these ranges. However, the number of ethyleneoxy units (—C2H4O) in the polyether chain (R1) must be sufficient to render the polyalkyleneoxide polysiloxane water dispersible or water soluble. If propyleneoxy groups are present in the polyalkylenoxy chain, they can be distributed randomly in the chain or exist as blocks. Preferred Silwet surfactants are L-7600, L-7602, L-7604, L-7605, L-7657, and mixtures thereof. Besides surface activity, polyalkyleneoxide polysiloxane surfactants can also provide other benefits, such as antistatic benefits, and softness to fabrics.
The preparation of polyalkyleneoxide polysiloxanes is well known in the art. Polyalkyleneoxide polysiloxanes of the present invention can be prepared according to the procedure set forth in U.S. Pat. No. 3,299,112, incorporated herein by reference.
Another suitable silicone surfactant is SF-1488, which is available from GE silicone fluids.
These and other surfactants suitable for use in combination with the lipophilic fluid as adjuncts are well known in the art, being described in more detail in Kirk Othmer's Encyclopedia of Chemical Technology, 3rd Ed., Vol. 22, pp. 360-379, “Surfactants and Detersive Systems”, incorporated by reference herein. Further suitable nonionic detergent surfactants are generally disclosed in U.S. Pat. No. 3,929,678, Laughlin et al., issued Dec. 30, 1975, at column 13, line 14 through column 16, line 6, incorporated herein by reference.
The adjunct may also be an antistatic agent. Any suitable well-known antistatic agents used in laundering and dry cleaning art are suitable for use in the methods and compositions of the present invention. Especially suitable as antistatic agents are the subset of fabric softeners which are known to provide antistatic benefits. For example those fabric softeners which have a fatty acyl group which has an iodine value of above 20, such as N,N-di(tallowoyl-oxy-ethyl)-N,N-dimethyl ammonium methylsulfate. However, it is to be understood that the term antistatic agent is not to be limited to just this subset of fabric softeners and includes all antistatic agents.
Although the methods and/or compositions utilized in present invention will be described in detail, it should be understood, and one skilled in the art will recognize, that any compositions, processes, and/or apparati capable of carrying out the invention could be used.
Method
The method of the present invention is directed to attaining improved fabric cleaning in a lipophilic fluid treatment regimen, and includes the steps of exposing the fabric to a lipophilic fluid and exposing the fabric to a bleach system. Optionally but preferably, it may include the step of exposing the fabric to a polar phase.
The polar phase may include water, alcohol, or mixtures thereof. If the polar phase does include water, it preferably comprises at least about 0.1%, preferably at least about 0.5% water and/or at least about 1% by weight of fabric and at most about 10% water, preferably at most about 5% by weight of fabric.
The bleach system may include oxygen-based bleach, bleach activator and a peroxide source, pre-formed peracid, oxidative bleach enzyme, photo bleach, bleach boosting compounds, metal bleach catalysts, ozone, chlorine dioxide or mixtures of multiple bleach systems. If the bleach system comprises pre-formed peracid, the polar phase preferably includes at least about 1% water by weight of fabric. Preferably, the bleach system has at least about 2 ppm AvO, more preferably at least about 25 ppm AvO, even more preferably at least about 50 ppm AvO, even more preferably at least about 100 ppm AvO. Preferably, the bleach system has at most about 10000 ppm AvO. Most preferably, the bleach system has at least about 100 ppm AvO and at most about 5000 ppm AvO. The bleach system may be within the polar phase and/or within the lipophilic fluid as opposed to being a stand-alone system.
The lipophilic fluid may comprise a linear siloxane, a cyclic siloxane, or mixtures thereof. Preferably, the lipophilic fluid is selected from the group consisting essentially of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and mixtures thereof. Even more preferably, the lipophilic fluid comprises decamethylcyclopentasiloxane. Most preferably, the lipophilic fluid comprises decamethylcyclopentasiloxane and is substantially free of octamethylcyclotetrasiloxane. Due to the flash points of the aforementioned siloxanes, the method preferably occurs at less than about 80° C.
While carrying out the method of the present invention, the fabrics may also be exposed to an emulsifier and/or a surfactant either separately or as a result of being contained within the polar phase, the lipophilic fluid, and/or the bleach system. The fabrics may also be exposed to adjunct ingredients selected from the group consisting essentially of enzymes, bleaches, surfactants, fabric softeners, perfumes, antibacterial agents, antistatic agents, brighteners, dye fixatives, dye abrasion inhibitors, anti-crocking agents, wrinkle reduction agents, wrinkle resistance agents, soil release polymers, sunscreen agents, anti-fade agents, builders, chelants, sudsing agents, composition malodor control agents, composition coloring agents, pH buffers, waterproofing agents, soil repellency agents, and mixtures thereof. These adjuncts can also be applied either separately or as a result of being contained within the polar phase, the lipophilic fluid, and/or the bleach system.
Composition
The composition of the present invention is directed to attaining improved fabric cleaning in a lipophilic fluid treatment regimen, wherein the composition comprises a lipophilic fluid and a bleach system. Optionally, the composition can further comprise a polar phase.
If included, the polar phase may include water, alcohol, and mixtures thereof. Also, the polar phase preferably comprises at least about 0.1% water by weight of composition and at most about 5% water by weight of composition.
Further, the polar phase comprises a buffer to maintain pH. The pH region is between 3-14. For compositions comprising bleach systems intended to form peracid in situ, the pH region is preferably 8-12, most preferably 9-11.
The composition delivering the bleach as well as the bulk wash fluid may contain a chelant to stabilize the product during storage prior to delivery in the lipophilic system. Such chelating agents may comprise, but are not limited to, ethylenediaminedisuccunate (EDDS), ethylene diamine tetra acetic acid (EDTA), quaternary ammonia compounds, or 1-Hydroxyethane-1,1-diphosphonic acid (HEDP).
The lipophilic fluid may comprise a linear siloxane, a cyclic siloxane, or mixtures thereof. Preferably, the lipophilic fluid comprises a lipophilic fluid selected from the group consisting essentially of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and mixtures thereof. More preferably, the lipophilic fluid comprises decamethylcyclopentasiloxane. Most preferably, the lipophilic fluid comprises decamethylcyclopentasiloxane and is substantially free of octamethylcyclotetrasiloxane.
The bleach system may include oxygen-based bleach, bleach activator and a peroxide source, pre-formed peracid, oxidative bleach enzyme, photo bleach, bleach boosting compounds, metal bleach catalysts, ozone, chlorine dioxide or mixtures of multiple bleach systems. If the bleach system comprises pre-formed peracid the polar phase preferably comprises at least about 1% water by weight of fabric. Preferably, the bleach system has at least about 2 ppm AvO, more preferably at least about 25 ppm AvO, even more preferably at least about 50 ppm AvO, even more preferably at least about 100 ppm AvO. Preferably, the bleach system has at most about 10000 ppm AvO. Most preferably, the bleach system has at least about 100 ppm AvO and at most about 5000 ppm AvO. The bleach system may be within the polar phase and/or within the lipophilic fluid as opposed to being a stand-alone component.
While carrying out the present invention, the fabrics may also be exposed to an emulsifier an/or a surfactant either separately or as a result of being contained within the polar phase, the lipophilic fluid, and/or the bleach system. The fabrics may also be exposed to adjunct ingredients selected from the group consisting essentially of enzymes, bleaches, emulsifiers, surfactants, fabric softeners, perfumes, antibacterial agents, antistatic agents, brighteners, dye fixatives, dye abrasion inhibitors, anti-crocking agents, wrinkle reduction agents, wrinkle resistance agents, soil release polymers, sunscreen agents, anti-fade agents, builders, chelants, sudsing agents, composition malodor control agents, composition coloring agents, pH buffers, waterproofing agents, soil repellency agents, and mixtures thereof. These adjuncts can also be applied either separately or as a result of being contained within the polar phase, the lipophilic fluid, and/or the bleach system.
It will be understood that the methods and/or compositions of the present invention may be combined with other fabric treatments. For example, prior to the application of the lipophilic fluid the fabric articles may be subjected to the particulate removal method described in co-pending application Ser. No. 60/191,965, to Noyes et al., filed Mar. 24, 2000, the relevant parts of which are incorporated herein by reference.
The present invention may be used in a service, such as a dry cleaning service, diaper service, uniform cleaning service, or commercial business, such as a Laundromat, dry cleaner, linen service which is part of a hotel, restaurant, convention center, airport, cruise ship, port facility, casino, or may be used in the home.
The methods and/or compositions of the present invention may be performed in an apparatus that is a modified existing apparatus and is retrofitted in such a manner as to conduct the process of the present invention in addition to related processes.
The methods and/or compositions of the present invention may also be performed in an apparatus, which is not a modified existing apparatus but is one specifically built in such a manner so as to conduct the process of the present invention or may be added to another apparatus as part of a lipophilic fluid processing system. This would include all the associated plumbing, such as connection to a chemical and water supply, and sewerage for waste wash fluids.
Finally, the methods of the present invention may be performed in an apparatus, which is not a modified existing apparatus but is one specifically built in such a manner so as to conduct the process of the present invention and related processes.
An apparatus used to carry out the present invention will typically contain some type of control system. These include electrical systems, such as, the so-called smart control systems, as well as more traditional electromechanical systems. The control systems would enable the user to select the size of the fabric load to be cleaned, the type of soiling, the extent of the soiling, the time for the cleaning cycle. Alternatively, the user could use pre-set cleaning and/or refreshing cycles, or the apparatus could control the length of the cycle, based on any number of ascertainable parameters. This would be especially true for electrical control systems. For example, when the collection rate of lipophilic fluid reaches a steady rate the apparatus could turn its self off after a fixed period of time, or initiate another process for the lipophilic fluid.
In the case of electrical control systems, one option is to make the control device a so-called “smart device”. This could mean including, but not limited to, self diagnostic system, load type and cycle selection, linking the machine to the Internet and allowing for the consumer to start the apparatus remotely, be informed when the apparatus has cleaned a fabric article, or for the supplier to remotely diagnose problems if the apparatus should break down. Furthermore, if the apparatus of the present invention is only a part of a cleaning system, the so called “smart system” could be communicating with the other cleaning devices which would be used to complete the remainder of the cleaning process, such as a washing machine, and a dryer.

## Claims

1. A composition for attaining improved fabric cleaning in a lipophilic fluid treatment regimen, said composition comprising from about 70% to about 99.9% by weight of decamethylcyclopentasiloxane, a polar phase comprising from about 0.1% to about 5% water, by weight of composition and a bleach system having a CIogP of from 1 to −1 said bleach system comprising a bleach hooster selected from the group consisting of dioxirane bleach booster compounds.