Fabric softening compositions

Abstract: This invention is concerned with a method of enhancing the anti-static properties of fabrics by treating them, during the laundering process, with compositions containing water- soluble polymer. More specifically, this invention is concerned with the addition of these polymers to fabric softener compositions used during the rinse cycle of the laundering process.

Description: The present invention is concerned with a method of enhancing the anti-static properties of all types of fabrics by treating them, during the laundering process, with compositions containing water-soluble polymers. More specifically, the present invention is concerned with the addition of water-soluble polymers to fabric softener compositions used during the rinse cycle of the laundering process. Furthermore, when added in effective amounts, the water-soluble polymers are compatible with rinse-added fabric softener compositions. Fabric softener compositions have been in commercial use for many years as treatments for laundered fabrics. Fabric softeners are generally employed as dryer-added sheets or as rinse-added fabric softeners. Fabric softeners impart favourable properties to the fabric such as enhanced softness, increased fluffiness, reduced levels of static electricity and easier ironing. A modern laundering process utilizing an automatic washing machine typically washes laundry in four stages. During the first stage, a wash cycle, the laundry is agitated in water containing a detergent. Next, during a first spin cycle, wash liquor is removed and the laundry is spun to remove excess water. This cycle is followed by a rinse cycle where the washing machine tub is filled with clean water, a rinse-added fabric softener is optionally added, and the laundry is again agitated. A final spin cycle removes the rinse liquor and the laundry is again spun to remove excess water. Following the laundering process, the laundry is either hung until dry or placed in an automatic dryer, optionally adding a dryer-added fabric softener sheet to the dryer. Rinse-added fabric softeners are generally dilute aqueous suspensions or dispersions of cationic softening agents such as quaternary ammonium compounds. Typically, the quaternary ammonium compounds are salts of the formula: where R 1 ,R 2 ,R 3 , and R 4 are lipophilic organic substituents and X is a halogen. The positively charged cation is readily adsorbed onto surfaces of fabric being laundered. This deposition of the cation onto the fabric imparts enhanced softness to the fabric and diminishes the static electricity built up on the fabric surface. Dryer-added sheets also employ quaternary ammonium salts to enhance softness and reduce the level of static electricity. In manufacturing the sheets, the quaternary ammonium salts are sprayed or coated onto a non-woven fabric, or they are added directly to the formulation used to make the non-woven fabric. Several attempts have been made to enhance the softness and anti-static properties of rinse-added fabric softeners through the addition of polymeric compounds. GB-A-1,549,180 to Dumbrell et al. teaches a composition useful for treating fabric in the final rinse of the laundering process. This composition contains a cationic quaternary ammonium compound with one or more long chain alkyl groups, and a silicone compound, such as a linear fluorinated polysiloxane. Through the use of this linear silicone compound, it is purported that, in addition to fabric softening benefits, this compound also imparts the benefits of easier ironing, anti-static properties, and soil resistant properties. US-A-4,908,140 to Bausch et al. reports a similar composition as that reported in Dumbrell et al. However, Bausch et al. found that through the use of an aqueous emulsion of a highly branched or crosslinked silicone polymer, as compared to the linear compounds of Dumbrell et al., the rewettability of fabrics was enhanced in addition to the softness. US-A-4,326,965 discloses a liquid fabric softening composition containing a cationic fabric softening agent and a polymeric additive such as polyethylene glycol with a molecular weight of 6,000. By the inclusion of polyethylene glycol, fabric softening compositions are prepared that are water-dispersable and pourable and can be more easily dispensed by an automatic dosing device into the rinse cycle on an automatic washing machine. No change in softening properties was reported. Japanese Patent Application J 89-023585-B addresses the problem of inferior softening and anti-static performance of fabric softeners on synthetic fibres as compared to cotton fibres. By using a softening composition containing cationic surfactant, such as a quaternary ammonium salt, and a carboxylic acid type anionic compound, the deposition of the quaternary ammonium salt onto synthetic fibres is increased. This softening composition containing the carboxylic acid type anionic compound is reported to lead to equivalent softening and antistatic properties on synthetic fibres as prior known compositions led to with cotton fibres. No improvement was reported for cotton fabrics. In addition, unlike the polymers used in the compositions of the present invention, many of the polymers used in Japanese Patent Application J 89-023585-B are not compatible with rinse-added fabric softener compositions. According to the present invention there is provided a fabric softening composition, which comprises from 25 to 95 percent by weight water, from 2 to 60 percent by weight of a cationic softening agent, and from 0.5 to 18 percent by weight of a water-soluble polymer, wherein said polymer is formed from: (a) at least one monomer selected from ethylenically unsaturated monocarboxylic acids and their salts, ethylenically unsaturated dicarboxylic acids, their salts and anhydrides, and, optionally, carboxylate-free monomer; and (b) one or more group selected from a surfactant radical and a polyalkylenoxy group, wherein the surfactant radical consists of a hydrophobic group linked to a polyalkylenoxy group and is prepared in a nonaqueous solvent or without any solvent. The present invention is concerned with an improved rinse-added fabric softener composition. The rinse-added fabric softener composition of the present invention contains a water-soluble polymer found to be useful in improving the anti-static properties. Accordingly, the present invention also provides a process for decreasing anti-static properties of textiles, which comprises rinsing a textile fabric in a fabric softening composition of the invention. The polymers found to be useful in the composition of the present invention include, for example, the polymers disclosed in our US-A-4,797,223 ('223). In addition, it has also been discovered that the polymers of the '223 patent can be further modified and be effective in the compositions of the present invention. Another group of polymers effective in the composition of the present invention include certain graft copolymers. The first group of water-soluble polymers useful in the composition of the present invention include two broad structural classes. The polymers in these two classes share several important characteristics. First, polymers in both classes are prepared from at least one monomer selected from ethylenically unsaturated C 3 -C 6 monocarboxylic acids and their salts, and ethylenically unsaturated dicarboxylic acids, their salts, and their anhydrides. Examples of the monocarboxylic acids include acrylic acid and sodium acrylate, and examples of the ethylenically unsaturated dicarboxylic acids include maleic acid, maleic anhydride, itaconic acid, mesaconic acid, fumaric acid and citraconic acid. Second, the polymers of this first group include either; a "surfactant" radical containing a hydrophobic group, for example a (C 1 -C 18 ) hydrocarbyl group, linked to a polyalkylenoxy group; or a polyalkylenoxy group. Depending on the preparative process employed, the surfactant radical can optionally contain a portion of a polymerizable ethylenically unsaturated "surfactant monomer" which is copolymerized with the acid, the anhydride and/or acid salt comonomer, or the radical can comprise a portion of an alcohol used to esterify or transesterify a polymer including carboxylic acid and/or carboxylic acid ester radicals. As a third alternative, the radical can comprise a portion of a mercaptan-functional chain transfer agent used in polymerizing monomer including ethylenically unsaturated carboxylic acid, anhydride and/or salts of such monomer. In addition to residues of polymerizable ethylenically unsaturated monocarboxylic acids, dicarboxylic acids, surfactant radicals and polyalkylenoxy groups, the water-soluble polymers of this first group can optionally include residues of "carboxylate-free" monomers. By "carboxylate-free" monomer it is meant an ethylenically unsaturated copolymerizable monomer not having pendant carboxylic acid and/or carboxylate salt functionality. An example of a carboxylate-free monomer is ethyl acrylate. Typically, the carboxylate-free monomer is copolymerized with the monocarboxylic acid and/or the dicarboxylic acid monomer. A "carboxylate-free" monomer can include a surfactant radical, such as in the case of an allyl ether-functional surfactant monomer. The water-soluble polymers in the first structural class of this first group of polymers share a common structural feature. The surfactant radical, the polyalkylenoxy group, or a combination thereof, can be positioned at any site along the "backbone" of the polymer chain, the "backbone" being viewed as made up of a sequence of alkylene groups which can have pendant carbonyl radicals. The surfactant radicals or the polyalkylenoxy groups are thus covalently linked to one or more sites along the polymer chain. The water-soluble polymers of the second structural class of the polymers in the first group have the surfactant radical, or the polyalkylenoxy group, or a combination thereof, at one terminus of the polymer chain. For example, when the surfactant radical is used, polymers in this structural class are typically prepared by including a chain transfer agent bearing the surfactant radical in the polymerization reaction mixture. The polymerization of individual polymer molecules is terminated by the chain transfer agent. The chain transfer process results in the surfactant radical being covalently linked to the terminus of the polymer chain. The polymers in this first group that are useful in the composition of the present invention may be prepared according to the methods described in our US-A-4,797,223 and in our US-A-5,130,369. In one embodiment of the present invention, the water-soluble polymers of this first structural group are selected from (a) polymers having the formula A(B) m (C) n (D) o E, (1) A being a group selected from R b -C(O)-R a -, R c -C(O)NH-R d - and R b -C(O)-R a -C(O)-R b -; R a being selected from (C 1 -C 5 )alkylidene and (C 1 -C 5 )alkylidene derivatives including a chain initiator or chain transfer radical, e.g. R a being selected from (C 2 -C 5 ) alkylidene and (C 2 -C 5 ) alkylidene derivatives including a chain initiator or chain transfer radical; R b being selected from -OQ and R c ; R c having the formula R 1 Z(X 1 ) a (X 2 ) b -; R 1 being selected from hydrogen, (C 1 -C 18 )alkyl, alkaryl in which the alkyl portion contains 1 to 18 carbon atoms, and aralkyl in which the alkyl portion contains 1 to 18 carbon atoms; Z being selected from -O-, -S-, -CO 2 -, -CONR 2 , and -NR 2 ; X 1 being -CH 2 CH 2 O-; X 2 being -C(CH 3 )HCH 2 O-; a being a positive integer and b being a non-negative integer, the sum of a and b being from 3 to 200, it being understood that the X 1 and X 2 units can be arranged in any sequence; R 2 being selected from H, (C 1 -C 4 )alkyl, and H(X 1 ) d (X 2 ) e -; d and e being non-negative integers, the sum of d and e being from 1 to 100; Q being selected from H and the positive ions forming soluble salts with carboxylate anions; R d being a group which includes a carbon-carbon single bond formed during polymerization of the polymer from a polymerizable carbon-carbon double bond; (2) B being a group selected from R e being a saturated trivalent aliphatic group having from two to five carbon atoms (3) C being selected from and R f being a group which includes a carbon-carbon single bond formed during polymerization of the polymer from a polymerizable carbon-carbon double bond; (4) D having the formula wherein G is an organic group excluding R c and -CO 2 Q; (5) E being a group selected from R c -R g -, R b -C(O)-R g -, R c -C(O)NH-R d -, and R b -C(O)-R a -C(O)-R g -, R g being selected from (C 1 -C 5 )alkylene and (C 1 -C 5 ) alkylene derivatives including a chain initiator or chain transfer radical, e.g. R g being selected from (C 2 -C 5 ) alkylene and (C 2 -C 5 ) alkylene derivatives including a chain initiator or chain transfer radical; m being a positive integer and n and o being non-negative integers, m being selected such that (B) m comprises from 20 to 95 percent by weight of the polymer, n being selected such that R c comprises from 80 to 5 percent by weight of the polymer, o being selected such that (D) o comprises from zero up to 30 percent by weight of the polymer, the sum of the weight percentages of A, (B) m , (C) n , (D) o and E being 100 percent, it being further understood that the B, C, and D groups can be arranged in any sequence; and the polymer having a number-average molecular weight from 500 to 50,000; and (b) polymers having the formula L-J, L- having the formula R c -C(O)(CHR 3 ) c -S-, -J having the formula -(B) m (D) o E, the subscript c being selected from 1, 2, and 3, R 3 being selected from H-, CH 3 -, and C 2 H 5 -, the weight ratio of L to J being from 1:340 to 7:1, o being selected such that (D) o comprises up to 40 percent by weight of the polymer, and the sum of m and n being from 10 to 500, and R c , B, D, E and m being as defined above . Such polymers may have a number average molecular weight of 1,000 to 15,000. In the above embodiment, A may be selected from B may be a group having the formula C may be a group having the formula and E may be selected from -CH 2 -CH 2 -C(O)-OQ and -CH 2 -CHCH 3 -C(O)-R c . Such polymers may include R c groups having the formula R 1 O(X 1 ) a - where R 1 is selected from hydrogen and (C 1 -C 18 ) alkyl (e.g. (C 10 -C 18 )alkyl), and a is from 5 to 45. Further, such polymers preferably have a number average molecular weight of from 1,000 to 5,000. The water soluble polymers may have the formula L-J, defined above, wherein the sum of m and o is from 20 to 150. Further, in the water soluble polymers of formula L-J, the weight ratio of L to J may be from 1:100 to 2:1. In the above embodiment G may be selected from -NH 2 , -NHR 3 , -OR 3 , -OR 4 -OH, -OR 4 NH, -OR 4 4-SO 3 Q, OR 4 -PO 3 Q, R 3 being (C 1 -C 8 )alkyl, and R 4 being (C 1 -C 8 )alkylene. Also in the above embodiment, R d may be alpha, alpha-dimethyl-meta-isopropenylbenzyl. In the above embodiment, it is to be understood that the term "non-negative integer" means "O or a positive integer". Another group of polymers useful in the composition of the present invention are graft copolymers formed from polymerized units of i) alkylene oxides, alkoxylates and combinations thereof, ii) ethylenically unsaturated carboxylic acid monomers and, optionally, iii) carboxylate-free monomers wherein said copolymers are prepared in a nonaqueous solvent or without any solvent. Examples of (i), the alkylene oxides and alkoxylates, include polymers based on ethylene oxide, propylene oxide, butylene oxide and combinations thereof. Preferably, the alkylene oxide is polyethylene oxide. Examples of (ii), the ethylenically unsaturated carboxylic acid monomers, include acrylic acid, methacrylic acid, maleic acid, itaconic acid, crotonic acid, vinylacetic acid, acryloxypropionic acid and combinations thereof. Preferably, the ethylenically unsaturated carboxylic acid monomer is acrylic acid. The optional carboxylate-free monomer includes any monomer copolymerizable with (i) and (ii). These graft polymers differ from the polymers of the first group described above in that these polymers are formed by the grafting of carboxylic acid monomers, or polymers formed from carboxylic acid monomers and carboxylate-free monomers, onto a polyalkylene oxide substrate by way of abstracting a hydrogen from the polyalkylene oxide substrate. These graft polymers can be formed by way of a non-aqueous graft polymerization process. The polymers useful in the compositions of the present invention must be compatible with rinse-added fabric softener compositions when added in effective amounts. The polymers used in the composition of the present invention are polymerized in a nonaqueous solvent or even preferably without any solvent present at all. It is in fact believed that the aqueous systems lead to a higher amount of residual homopolymer. It is further believed that it is these homopolymers that lead to poor compatibility with rinse-added fabric softening compositions. The polymer is added to the rinse-added fabric softener such that it is present in the fabric softening composition at a concentration of from 0.5 to 18 percent by weight, preferably from 0.5 to 3.5 percent by weight, and more preferably from 0.5 to 2 percent by weight, based on the total weight of the composition. The fabric softening composition of the present invention may also be in concentrate form, whereby it is preferable for the polymer level to be from 2 to 18 percent by weight, based on the total weight of the composition. It is also preferable to neutralize the polymer, for example with sodium hydroxide, before mixing the polymer with the fabric softening composition. In addition, the composition contains from 25 to 95 percent water by weight, based on the total weight of the composition, and from 2 to 60 percent by weight of a cationic softening agent, e.g. a known cationic softening agent as defined above. The fabric softening compositions of the present invention can be used in either the home laundering process or the industrial laundering process and therefore the composition may depend on the specific use. Besides the polymer, water and cationic softening agents, the composition may further contain other normal adjuvants well known to those skilled in the art. Examples of such adjuvants include viscosity modifiers, germicides, fluorescers, perfumes including deodorizing perfumes, organic or inorganic acids, soil resistant agents, colorants, anti-oxidants, anti-yellowing agents and ironing aids. These additives can be incorporated into the composition either alone or in suitable carriers. Besides water, the composition may also include other solvents such as a lower alkanol, a glycol or a glycolether. The fabric softening compositions of the present invention can be prepared as either a ready-to-use composition or as a concentrate. If it is in the concentrate form, it can be diluted with an appropriate solvent, for example water, before use. The following Examples are presented to illustrate preferred embodiments of the present invention. In the following Examples, percentage composition is by weight. Examples 1 and 2 - Polymer Preparation Example 1 To a two litre, 4 neck flask equipped with a mechanical stirrer, reflux condenser, and inlets for the gradual addition of monomer, was added 225 grams of polyethylene glycol 1000 (PEG, molecular weight 1000). The PEG was heated to 150°C and then 75 grams of glacial acrylic acid and 3.75 grams di-t-butyl peroxide were added over a period of one hour. Once the addition was completed, the contents of the reaction flask were held at 150°C for an additional 30 minutes and then allowed to cool to ambient temperature. Example 2 The same procedure as Example 1 was followed except 260 grams of polyethylene glycol 8000 (PEG, molecular weight 8,000), 140 grams glacial acrylic acid, and 14 grams di-t-butylperoxide were used in the preparation of the sample. Test Procedures Compatibility Several different types of polymers were added at a 2% active polymer concentration to Snuggle ("Snuggle" is a trademark of Lever Brothers) fabric softener, Downy ("Downy" is a trademark of the Procter & Gamble Co.) fabric softener, and a fabric softener formulation made in our laboratory. The composition was stirred for one hour. If a precipitate was observed in any of the compositions, the polymer was classified as incompatible. Test results are shown in Table I. Compatibility Data Incompatible Polymers Compatible Polymers polyacrylic acid AA/(12 EO/12-15 C) 70 AA/30 maleic anhydride AA/(10 EO/16 C) 77 AA/23 AMPS AA/(40 EO/16 C) 70 AA/30 MA AA/PEG-Example 1 (non-aqueous) AA/PEG grafts (aqueous) , 29% PEG 8000 29% PEG 1000 29% PEG 3400 44% PEG 3400 AA/(12 EO/12-15 C) (aqueous) Anti-Static Test Procedure-Domestic Test cloths were purchased from Testfabrics, Inc. Middlesex, N.J. The size of each test cloth was 77.42 cm 2 (twelve square inches) and the cloths were composed of the following types of fabrics; 100 percent nylon; 100 percent cotton; 100 percent acrylic; 100 percent polyester; and 65 percent polyester/35 percent cotton (poly/cotton). In addition, 100 percent cotton bed-sheets were used during the laundering process to provide ballast to the machine's load. Kenmore ("Kenmore" is a trademark of Sears Corporation) heavy duty automatic washers, 80 series, were used for cloth washing and treating. Water fill levels were set on high, corresponding to approximately 84 litres of water, and the water temperature settings were warm for the wash cycle and cold for the rinse cycle. These temperature settings corresponded to about 37.78°C (100°F) wash cycle and 21.11°C (70°F) rinse temperatures. After the wash cycle, the cloths were dried in an electric dryer. A Keithly model 610C Electrometer equipped with a model 2501 static probe was used to measure static charge on the fabric. Initially, the experimental cloths and the cotton bed-sheets were machine-washed with Tide ("Tide" is a trademark of Procter & Gamble Co.) laundry detergent granules and rinsed until the cloths were free from any foam. This step was used to remove any non-permanent coatings present on the fabric as a result of the manufacturing process. Then, in the actual testing of the various rinse-added fabric softeners of the present invention, the experimental cloths were added to the machine, along with the cotton sheets, and the machine was run through a regular wash cycle. In the wash cycle, when the water level was reached, 1/2 dose of heavy duty laundry detergent was added, either Tide liquid laundry detergent or Wisk ("Wisk" is a trademark of Lever Brothers) laundry detergent. At the start of the rinse cycle, when the desired water level was reached and agitation started, the rinse-added fabric softener was added. Unless otherwise indicated in the Tables, the dose of fabric softener added was one capful, equal to 90 ml. Once the cleaning, rinse and spin cycles were completed, the fabrics were placed in the dryer for one to two hours, removed from the dryer and then passed under the static probe to measure the values recorded in volts. The polymers useful in this invention were added to various commercially available rinse-added fabric softeners. They were added at the percentages shown in the Tables. Specifically used were Snuggle fabric softener and Downy fabric softener. Tables II-VI show the results of testing with no additives, with commercially available rinse-added fabric softener and with commercially available rinse-added fabric softeners and polymer. The polymers shown in Tables II and III (polymer A and B) are compositionally the same. The difference is that polymer B was added as a 70 percent by weight solution of polymer in propylene glycol. Table III contains comparative data showing the absence of any anti-static effect due to the propylene glycol. With all of the types of fabrics tested, including cotton (see Table IV), the added polymer improves the anti-static properties of the fabric. Tables VII and VIII show the anti-static properties with no additives, with added cationic softening agents and with cationic softening agent and added copolymer of Example 1. Again, the anti-static properties of the fabrics tested were improved when the polymer was added to the rinse treatment. These results can be compared to the results in Table IX where only polyethylene glycol was added and only limited effectiveness on certain fabrics was achieved. Anti-Static Test Procedure-Industrial Nylon, polyester/cotton, polyester test fabrics, and cotton ballast [1.36 kg (3 pounds)] were washed in an Eumenia model EU-340 European Style mini-washer. The laundering cycle and wash/rinse formula was adjusted to simulate industrial and institutional conditions. This consisted of a 15 minute wash (soft water, 90°C, 400 ppm Triton ('Triton" is a trademark of the Union Carbide Company) N-101 surfactant, 2500 ppm NaOH, and 0.5 grams used cooking oil as background soil) followed by three sequential 2 minute rinses. The final rinse pH was adjusted to 5-7 with 25% H 2 SO 4 , followed by the addition of the softener/anti-static agent to bring the concentration of actives in the wash bath to the levels indicated in Table X. The final rinse lasted 10 minutes. Measurement of static charge is the same as described for domestic laundry testing. The anti-static test results for the industrial testing can be seen in Table X. The standard deviation of all the voltage measurements given in the following Tables varies, but is approximately 20% of the measured value. Anti-Static Properties of Rinse Added Fabric Softener and Polymer B Rinse Treatment VOLTS ACRYLIC NYLON POLY/COTTON None 18,000 13,000 4,500 Snuggle 6,000 9,000 2,000 Snuggle + 0.5% Polymer B 3,000 6,300 3,000 Snuggle + 1.5% Polymer B 100 100 500 Snuggle + 2.5% Polymer B 10 100 500 Anti-Static Properties of Rinse Added Fabric Softener and Polymer Rinse Treatment VOLTS Acrylic Nylon Poly/Cotton None 22,300 16,700 3,700 Snuggle 5,300 3,700 2,300 Snuggle + 2% Polymer A 500 600 1,200 Snuggle + 2% Polymer B 800 1,200 600 Snuggle + 1% propylene glycol 8,000 6,000 900 Anti-Static Properties of Rinse Added Fabric Softener and Polymer Rinse Treatment VOLTS Acrylic Nylon Poly/Cotton Cotton None 20,300 17,800 11,800 3,000 Snuggle 10,500 3,100 2,000 3,400 Snuggle + Polymer E 300 200 400 200 Snuggle + Polymer F 4,100 1,900 2,400 800 Snuggle + Polymer G 1,300 1,200 1,100 1,600 Anti-Static Properties of Polymer in Rinse Added Fabric Softeners Rinse Treatment VOLTS Acrylic Nylon Poly/Cotton None 19000 13000 6000 Snuggle 7500 9000 4300 Snuggle + Polymer D 2900 5000 6000 Snuggle + Polymer C 1200 2400 1600 Anti-Static Properties of Rinse Added Fabric Softener and Polymer RINSE TREATMENT VOLTS ACRYLIC NYLON POLYESTER None 21,000 12,000 28,000 Downy 6,300 4,800 7,000 Downy + 1% Polymer A 2,700 4,000 5,200 Downy + 1.5% Polymer A 500 1,000 1,300 Downy + 2.5% Polymer A 300 300 1,000 Downy @1.5X Dose 500 5,000 4,000 Bounce (1 sheet) in full size dryer <10 <10 <10 Anti-Static Properties of Quaternary Salt and Polymer RINSE TREATMENT VOLTS ACRYLIC NYLON POLY/COTTON None 17,000 13,000 2,800 5% Quat 8,300 7,500 2,000 4% Quat, 1% Polymer H 5,500 6,900 2,800 3.5% Quat, 1.5% Polymer H 2,500 1,600 2,100 2.5% Quat, 2.5% Polymer H 1,900 1,700 2,000 1% Quat, 4% Polymer H 4,600 5,100 1,000 5% Polymer H 22,000 15,000 5,500 Anti-Static Properties of Quaternary Salt and Polymer RINSE TREATMENT VOLTS NYLON POLYESTER POLY/COTTON None 15,300 28,700 12,700 5% Quat 5,700 5,000 3,700 4% Quat and 1% Polymer H 4,700 5,700 4,300 3.5% Quat and 1.5% Polymer H 1,300 1,700 500 2.5% Quat and 2.5% Polymer H 1,000 2,400 1,300 1% Quat and 4% Polymer H 12,700 21,000 8,700 5% Polymer H 16,000 25,000 12,000 Anti-Static Properties of Polyethylene Glycol (Comparative) Rinse Treatment VOLTS Acrylic Nylon Poly/Cotton Cotton None 10,500 9,800 4,700 2,300 Snuggle 13,000 3,300 2,300 10,000 Snuggle + PEG 550 13,200 4,200 1,700 3,200 Snuggle + PEG 1000 14,700 7,800 3,000 2,800 Snuggle + PEG 20,000 9,200 2,100 2,900 4,100 Anti-Static Properties of Polymers Under Industrial and Institutional Laundering Conditions Rinse Treatment VOLTS Nylon Poly/Cotton Polyester 15 ppm Quat 16,000 13,000 15,000 15 ppm Quat and 15 ppm Polymer I 4,000 2,700 7,000

Claims: A fabric softening composition, which comprises from 25 to 95 percent by weight water, from 2 to 60 percent by weight of a cationic softening agent, and from 0.5 to 18 percent by weight of a water-soluble polymer, wherein said polymer is formed from: (a) at least one monomer selected from ethylenically unsaturated monocarboxylic acids and their salts, ethylenically unsaturated dicarboxylic acids, their salts and anhydrides, and, optionally, carboxylate-free monomer; and (b) one or more group selected from a surfactant radical and a polyalkylenoxy group, wherein the surfactant radical consists of a hydrophobic group linked to a polyalkylenoxy group and is prepared in a nonaqueous solvent or without any solvent. A fabric softening composition as claimed in claim 1, wherein the water-soluble polymer is selected from: (a) polymers having the formula A(B) m (C) n (D) o E, (1) A being a group selected from R b -C(O)-R a -, R c -C(O)NH-R d - and R b -C(O)-R a -C(O)R b -; R a being selected from (C 1 -C 5 )alkylidene and (C 1 -C 5 )alkylidene derivatives including a chain initiator or chain transfer radical; R b being selected from -OQ and R c ; R c having the formula R 1 Z(X 1 ) a (X 2 ) b -; R 1 being selected from hydrogen, (C 1 -C 18 )alkyl, alkaryl in which the alkyl portion contains 1 to 18 carbon atoms, and aralkyl in which the alkyl portion contains 1 to 18 carbon atoms; Z being selected from -O-, -S-, -CO 2 -, -CONR 2 , and -NR 2 ; X 1 being -CH 2 CH 2 O-; X 2 being -C(CH 3 )HCH 2 O-; a being a positive integer and b being a non-negative integer, the sum of a and b being from 3 to 200, it being understood that the X 1 and X 2 units can be arranged in any sequence; R 2 being selected from H, (C 1 -C 4 )alkyl, and H(X 1 ) d (X 2 ) e -; d and e being non-negative integers, the sum of d and e being from 1 to 100; Q being selected from H and the positive ions forming soluble salts with carboxylate anions; R d being a group which indudes a carbon-carbon single bond formed during polymerization of the polymer from a polymerizable carbon-carbon double bond; (2) B being a group selected from R e being a saturated trivalent aliphatic group having from two to five carbon atoms (3) C being selected from and R f being a group which includes a carbon-carbon single bond formed during polymerization of the polymer from a polymerizable carbon-carbon double bond; (4) D having the formula wherein G is an organic group excluding R c and CO 2 Q; (5) E being a group selected from R c -R g -, R b -C(O)-R g -, R c -C(O)NH-R d -, and R b -C(O)-R a -C(O)-R g -, R g being selected from (C 1 -C 5 )alkylene and (C 1 -C 5 ) alkylene derivatives induding a chain initiator or chain transfer radical; m being a positive integer and n and o being non-negative integers, m being selected such that (B) m comprises from 20 to 95 percent by weight of the polymer, n being selected such that R c comprises from 80 to 5 percent by weight of the polymer, o being selected such that (D) o comprises from zero up to 30 percent by weight of the polymer, the sum of the weight percentages of A, (B) m , (C) n , (D) o and E being 100 percent, it being further understood that the B, C, and D groups can be arranged in any sequence; and the polymer having a number-average molecular weight from 500 to 50,000; and (b) polymers having the formula L-J, L- having the formula R c -C(O)(CHR 3 ) c -S-, -J having the formula -(B) m (D) o E, the subscript c being selected from 1, 2, and 3, R 3 being selected from H-, CH 3 -, and C 2 H 5 -, the weight ratio of L to J being from 1:340 to 7:1, o being selected such that (D) o comprises up to 40 percent by weight of the polymer, and the sum of m and n being from 10 to 500, and R c , B, D, E and m being as defined above . A fabric softening composition, as daimed in claim 2, wherein: (a) R a , when present, is selected from (C 2 -C 5 ) alkylidene and (C 2 -C 5 ) alkylidene derivatives including a chain initiator or chain transfer radical; and/or (b) R g , when present, is selected from (C 2 -C 5 ) alkylene and (C 2 -C 5 ) alkylene derivatives including a chain initiator or chain transfer radical. A fabric softening composition as claimed in claim 2 or claim 3, wherein (1) A is selected from (2) B is a group having the formula (3) C is a group having the formula and (4) E is selected from -CH 2 -CH 2 -C(O)-OQ and -CH 2 -CHCH 3 -C(O)-R c . A fabric softening composition as claimed in claim 4, wherein the polymer includes R C groups having the formula R 1 O(X 1 ) a - wherein R 1 is selected from hydrogen and (C 1 -C 18 )alkyl, and a is from 5 to 45. A fabric softening composition as claimed in claim 5, wherein R 1 is (C 10 -C 18 )alkyl. A fabric softening composition as claimed in claim 6, wherein the number average molecular weight of the polymer is from 1000 to 5000. A fabric softening composition as claimed in daim 2 or claim 3, wherein the water-soluble polymer has the formula L-J, the sum of m and o being from 20 to 150. A fabric softening composition as claimed in claim 2 or claim 3, wherein the water-soluble polymer has the formula L-J, and the weight ratio of L to J is from 1:100 to 2:1. A fabric softening composition as claimed in claim 2 or claim 3, wherein G is selected from -NH 2 , -NHR 3 , -OR 3 , -OR 4 -OH, -OR 4 NH, -OR 4 -SO 3 Q, OR 4 -PO 3 Q, R 3 being (C 1 -C 8 )alkyl, and R 4 being (C i -C 8 )alkylene. A fabric softening composition as claimed in claim 2 or claim 3, wherein R d is alpha,alpha-dimethyl-meta-isopropenylbenzyl. A fabric softening composition as claimed in claim 2 or claim 3, wherein the number average molecular weight of the polymer is from 1,000 to 15,000. A fabric softening composition, which comprises from 25 to 95 percent by weight water, from 2 to 60 percent by weight of a cationic softening agent and from 0.5 to 18 percent by weight of a water-soluble copolymer, wherein said copolymer is formed from a grafting reaction between i) polyalkylene oxides, polyalkoxylates and combinations thereof, ii) ethylenically unsaturated carboxylic acid monomers, polymers formed from polymerized units of ethylenically unsaturated carboxylic acid monomers, and optionally, iii) carboxylate-free monomers; and wherein said copolymer is prepared in a nonaqueous solvent or without any solvent. A fabric softening composition as claimed in claim 13, wherein the ethylenically unsaturated carboxylic acid monomers are selected from acrylic acid, methacrylic acid, maleic acid, itaconic acid, crotonic acid, vinyl acetic acid, acryloxy propionic acid, and combinations thereof. A fabric softening composition as claimed in claim 13, wherein the ethylenically unsaturated carboxylic acid monomer used to form the copolymer is acrylic acid. A fabric softening composition as claimed in claim 13, wherein the polyalkylene oxides used to form the copolymer are selected from polymers based on ethylene oxide, propylene oxide, butylene oxide, and combinations thereof. A fabric softening composition as claimed in claim 13, wherein the polyalkylene oxide is polyethylene oxide. A process for decreasing anti-static properties of textiles, which comprises rinsing a textile fabric in a fabric softening composition as claimed in any of claims 1 to 17. Use of a composition as claimed in any of the claims 1 to 17 as a fabric softening composition.

Inventors: SCHWARTZ CURTIS, SCHWARTZ, CURTIS
Applicants: ROHM & HAAS, ROHM AND HAAS COMPANY
Application year: 1992
Main classification: C11D3
IPC codes: C11D3