Patent Publication Number: US-6667287-B2

Title: Light duty cleaning composition comprising an amine oxide and polyacrylic acid homopolymer

Description:
RELATED APPLICATION 
     This application is a continuation in part application of U.S. Ser. No. 09/854,745 filed May 14, 2001, now abandoned which in turn is a continuation in part of U.S. Ser. No. 09/553,186 filed Apr. 20, 2000, now abandoned. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a toilet bowl cleaner which contains a nonionic surfactant, a disinfecting agent, a polymeric viscosity modifier and water as well as a light duty liquid cleaning composition containing a polymeric viscosity modifier. 
     BACKGROUND OF THE INVENTION 
     Numerous compositions and apparatus have been previously disclosed for cleaning toilet bowls. These compositions are designed to impede irritable smells and bacteria build up. 
     U.S. Pat. No. 4,852,201 teaches a cleaning composition containing a surfactant, alkali metal carbonate and acid. 
     U.S. Pat. No. 5,977,050 teaches a sprayable toilet bowl cleaning composition which is in a gel form which comprises a surfactant, crosslinked polyacrylic acid, a glycol ether solvent and water. 
     U.S. Pat. No. 5,534,265 relates to a personal cleaning composition which can contain a Polyquaternium 37 type polymer and water insoluble particles. 
     SUMMARY OF THE INVENTION 
     The instant invention relates to a toilet bowl cleaning composition which contains an ethoxylated nonionic surfactant, a disinfecting agent, a polymeric thickening agent and water as well as a light duty liquid cleaning composition containing a polymeric viscosity modifier. 
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention relates to a liquid toilet bowl cleaning composition which comprises approximately by weight: 
     (a) 0.1% to 8%, more preferably 1% to 6% of a nonionic surfactant; 
     (b) 0.05% to 2.5%, more preferably 0.1% to 1.5% of a disinfecting agent; 
     (c) 0.05% to 2%, more preferably 0.1% to 1% of a perfume; 
     (d) 0.1% to 2.5%, more preferably 0.2% to 1.5% of a polymeric viscosity modifier; and 
     (e) the balance being water, wherein the toilet bowl composition does not contain an anionic surfactant, a cationic surfactant, an ethylene glycol ether, a propylene glycol ether, a fluorosurfactant, a thickener such as silica, methyl cellulose, clay, xanthan gum, polysaccharide or magnesium aluminum silicate, a polyglucoside or glucoside surfactant, sodium hydroxide, a halogen donating compound such as halohydantions such as 1,3-dichloro-5,5-dimethyl hydantoin, 1,3-dichloro-5-ethyl-5methyl hydatoin and 1-bromo-3-3-chloro-5,5-dimethyl hydatoin and calcium hypochlorite, an abrasive, a suspending agent such as a hydrophilic silica, calcium carbonate, sodium bicarbonate, aluminum oxide, alignates, guar gum, cellulosis, or a propellant such as a hydrocarbon having 1 to 10 carbon atoms such as propane or isobutane. 
     The present invention also relates to a light duty liquid cleaning composition which comprises approximately by weight: 
     (a) 0.5% to 14% of an amine oxide surfactant; 
     (b) 0 to 12%, more preferably 0.5% to 9% of a disinfecting agent; 
     (c) 0 to 2%, more preferably 0.1% to 1% of a perfume; 
     (d) 0.1% to 2.5%, more preferably 0.2% to 1.5% of a polymeric viscosity modifier; 
     (e) 10% to 20% of a nonionic surfactant; and 
     (f) the balance being water, wherein the light duty liquid cleaning composition does not contain an anionic surfactant, a cationic surfactant, an ethylene glycol ether, a propylene glycol ether, a fluorosurfactant, a thickener such as silica, methyl cellulose, clay, xanthan gum, polysaccharide or magnesium aluminum silicate, a polyglucoside or glucoside surfactant, a halogen donating compound such as halohydantions such as 1,3-dichloro-5,5-dimethyl hydantoin, 1,3-dichloro-5-ethyl-5methyl hydatoin and 1-bromo-3-3-chloro-5,5-dimethyl hydatoin and calcium hypochlorite, an abrasive, a suspending agent such as a hydrophilic silica, calcium carbonate, sodium bicarbonate, aluminum oxide, alignates, guar gum, cellulosis, or a propellant such as a hydrocarbon having 1 to 10 carbon atoms such as propane or isobutane. Also excluded from the instant light duty liquid cleaning composition insoluble particles selected from the group consisting of polybutylene, polyethene, polyisobutylene, polymethylstyrene, polypropylene, polystyrene, polyurethane, nylon, teflon, and mixtures thereof having a mean particle size diameter from about 20 microns to about 50 microns. 
     The water soluble nonionic surfactants utilized in the toilet bowl cleaning composition or the light duty liquid cleaning composition of this invention are commercially well known and include the primary aliphatic alcohol ethoxylates, secondary aliphatic alcohol ethoxylates, alkylphenol ethoxylates and ethylene-oxide-propylene oxide condensates on primary alkanols, such a Plurafacs (BASF) and condensates of ethylene oxide with sorbitan fatty acid esters such as the Tweens (ICI). The nonionic synthetic organic detergents generally are the condensation products of an organic aliphatic or alkyl aromatic hydrophobic compound and hydrophilic ethylene oxide groups. Practically any hydrophobic compound having a carboxy, hydroxy, amido, or amino group with a free hydrogen attached to the nitrogen can be condensed with ethylene oxide or with the polyhydration product thereof, polyethylene glycol, to form a water soluble nonionic detergent. 
     The nonionic detergent class includes the condensation products of a higher alcohol (e.g., an alkanol containing about 8 to 18 carbon atoms in a straight or branched chain configuration) condensed with about 5 to 30 moles of ethylene oxide, for example, lauryl or myristyl alcohol condensed with about 16 moles of ethylene oxide (EO), tridecanol condensed with about 6 to moles of EO, myristyl alcohol condensed with about 10 moles of EO per mole of myristyl alcohol, the condensation product of EO with a cut of coconut fatty alcohol containing a mixture of fatty alcohols with alkyl chains varying from 10 to about 14 carbon atoms in length and wherein the condensate contains either about 6 moles of EO per mole of total alcohol or about 9 moles of EO per mole of alcohol and tallow alcohol ethoxylates containing 6 EO to 11 EO per mole of alcohol. 
     A preferred group of the foregoing nonionic surfactants are the Neodol ethoxylates (Shell Co.), which are higher aliphatic, primary alcohol containing about 9-15 carbon atoms, such as C 9 -C 11  alkanol condensed with 8 moles of ethylene oxide (Neodol 91-8), C 12-13  alkanol condensed with 6.5 moles ethylene oxide (Neodol 23-6.5), C 12-15  alkanol condensed with 12 moles ethylene oxide (Neodol 25-12), C 14-15  alkanol condensed with 13 moles ethylene oxide (Neodol 45-13), and the like. Such ethoxamers have an HLB (hydrophobic lipophilic balance) value of about 8 to 15 and give good O/W emulsification, whereas ethoxamers with HLB values below 8 contain less than 5 ethyleneoxide groups and tend to be poor emulsifiers and poor detergents. 
     Additional satisfactory water soluble alcohol ethylene oxide condensates are the condensation products of a secondary aliphatic alcohol containing 8 to 18 carbon atoms in a straight or branched chain configuration condensed with 5 to 30 moles of ethylene oxide. Examples of commercially available nonionic detergents of the foregoing type are C 11 -C 15  secondary alkanol condensed with either 9 EO (Tergitol 15-S-9) or 12 EO (Tergitol 15-S-12) marketed by Union Carbide. 
     Other suitable nonionic detergents include the polyethylene oxide condensates of one mole of alkyl phenol containing from about 8 to 18 carbon atoms in a straight- or branched chain alkyl group with about 5 to 30 moles of ethylene oxide. Specific examples of alkyl phenol ethoxylates include nonyl phenol condensed with about 9.5 moles of EO per mole of nonyl phenol, dinonyl phenol condensed with about 12 moles of EO per mole of dinonyl phenol, dinonyl phenol condensed with about 15 moles of EO per mole of phenol and di-isoctylphenol condensed with about 15 moles of EO per mole of phenol. Commercially available nonionic surfactants of this type include Igepal CO-630 (nonyl phenol ethoxylate) marketed by GAF Corporation. 
     Condensates of 2 to 30 moles of ethylene oxide with sorbitan mono- and tri-C 10 -C 20  alkanoic acid esters having a HLB of 8 to 15 also may be employed as the nonionic detergent ingredient in the described shampoo. These surfactants are well known and are available from Imperial Chemical Industries under the Tween trade name. Suitable surfactants include polyoxyethylene (4) sorbitan monolaurate, polyoxyethylene (4) sorbitan monostearate, polyoxyethylene (20) sorbitan trioleate and polyoxyethylene (20) sorbitan tristearate. 
     The instant light duty liquid cleaning or toilet bowl cleaning compositions contain a disinfectant agent selected from the group consisting of C 8 -C 16  alkyl amines, C 8 -C 16  alkyl benzyl dimethyl ammonium chlorides, benzalkonium chloride, C 8 -C 16  dialkyl dimethyl ammonium chlorides, C 8 -C 16  alkyl, C 8 -C 14  alkyl dimethyl ammonium chloride and chlorohexidine and mixtures thereof. Some typical disinfectant agent useful in the instant compositions are manufactured by Lonza, S. A. They are: Bardac 2180 (or 2170) which is N-decyl-N-isonoxyl-N, N-dimethyl ammonium chloride; Bardac 22 which is didecyl dimethyl ammonium chloride; Bardac LF which is N,Ndioctyl-N, N-dimethyl ammonium chloride; Bardac 114 which is a mixture in a ratio of 1:1:1 of N-alkyl-N, N-didecyl-N, N-dimethyl ammonium chloride/N-alkyl-N, N-dimethyl-N-ethyl ammonium chloride; and Barquat MB-50 which is N-alkyl-N, N-dimethyl-N-benzyl ammonium chloride. The preferred disinfecting agent is a C 8 -C 16  alkyl benzyl dimethyl ammonium chloride. 
     Amine oxide semi-polar nonionic surfactants optionally, used in the instant light duty liquid cleaning compositions comprise compounds and mixtures of compounds having the formula:                    
     wherein R 1  is an alkyl, 2-hydroxyalkyl, 3-hydroxyalkyl, or 3-alkoxy-2-hydroxypropyl radical in which the alkyl and alkoxy, respectively, contain from 8 to 18 carbon atoms, R 2  and R 3  are each methyl, ethyl, propyl, isopropyl, 2-hydroxyethyl, 2-hydroxypropyl, or 3-hydroxypropyl, and n is from 0 to 10. Particularly preferred are amine oxides of the formula:                    
     wherein R 1  is a C 12-16  alkyl, or cocoamidopropyl group and R 2  and R 3  are methyl or ethyl. The above ethylene oxide condensates, amides, and amine oxides are more fully described in U.S. Pat. No. 4,316,824 which is hereby incorporated herein by reference. Preferred amine oxides are lauryl amine oxide and cocoamido propyl amine oxide. 
     The instant light duty liquid cleaning or toilet bowl cleaning composition contains about 0.1 to 2.5 wt. %, more preferably 0.2 to 1.5% of a polymeric viscosity modifier which permits the toilet bowl cleaning composition to have a Brookfield viscosity RVDV, 25° C., cps about 150 to 400 cps, more preferably 175 to 250 cps and the light duty liquid cleaning composition to have a Brookfield viscosity RVDV, 25° C. cps about 50 to 200 cps, more preferably 75 to 100 cps. The polymeric viscosity modifier agent is a noncrosslinked quaternary acrylic acid homopolymer having a molecular weight of about 30,000 to about 2,000,000 such as Polygel K200 manufactured by 3V Inc. of Georgetown, S.C. Polygel-K-200 is N,N,N-Trimethyl-2[Methyl-1-oxo-Propenyl]oxy-chloride homopolymer. 
     As used herein the term “perfume” is used in its ordinary sense to refer to and include any non-water soluble fragrant substance or mixture of substances including natural (i.e., obtained by extraction of flower, herb, blossom or plant), artificial (i.e., mixture of natural oils or oil constituents) and synthetically produced substance odoriferous substances. Typically, perfumes are complex mixtures of blends of various organic compounds such as alcohols, aldehydes, ethers, aromatic compounds and varying amounts of essential oils (e.g., terpenes) such as from 0 to 80%, usually from 10% to 70% by weight, the essential oils themselves being volatile odoriferous compounds and also serving to dissolve the other components of the perfume. 
     In the present invention the precise composition of the perfume is of no particular consequence to cleaning performance so long as it meets the criteria of water immiscibility and having a pleasing odor. Naturally, of course, especially for cleaning compositions intended for use in the home, the perfume, as well as all other ingredients, should be cosmetically acceptable, i.e., non-toxic, hypoallergenic, etc. The instant compositions show a marked improvement in ecotoxocity as compared to existing commercial products. 
     The final essential ingredient in the inventive toilet bowl cleaning composition and light duty liquid cleaning compositions is water. The proportion of water in the toilet bowl cleaning composition compositions generally is in the range of 20% to 97%, preferably 70% to 97% by weight. The proportion of water in the light duty liquid cleaning composition is in the range of 30% to 80%, preferably 50% to 70%. 
     The liquid toilet bowl or light duty liquid cleaning compositions of this invention may, if desired, also contain other components either to provide additional effect or to make the product more attractive to the consumer. The following are mentioned by way of example: Colors or dyes in amounts up to 0.5% by weight; bactericides in amounts up to 1% by weight; preservatives or antioxidizing agents, such as EDTA, formalin, 5-bromo-5-nitro-dioxan-1,3; 5-chloro-2-methyl-4-isothaliazolin-3-one, 2,6-di-tert.butyl-p-cresol, etc., in amounts up to 2% by weight; and pH adjusting agents, such as sulfuric acid or sodium hydroxide, as needed. 
     The toilet bowl or light duty liquid cleaning composition can optionally include at a concentration of 0 to 2.5 wt. %, more preferably 0.1 to 1.5 wt. % a proton donating agent selected from the group consisting of nonhydroxy containing organic acids such as succinic acid, glutaric acid, adipic acid, hydroxy containing organic acids such as ortho hydroxy benzoic acid, citric acid and lactic acid and inorganic acids such as sulfuric acid, hydrochloric acid and phosphoric acid and mixtures thereof. 
     In final form, the compositions exhibit stability at reduced and increased temperatures. More specifically, such compositions remain clear and stable in the range of 4° C. to 50° C., especially 2° C. to 43° C. Such compositions exhibit a pH in the acid to neutral range. 
     The compositions are directly ready for use or can be diluted as desired and in either case no or only minimal rinsing is required and substantially no residue or streaks are left behind. Furthermore, because the compositions are free of detergent builders such as alkali metal polyphosphates they are environmentally acceptable. 
     Addition of Polygel K200 requires special procedures to assure complete and timely hydration. As soon as Polygel K200 contacts an aqueous medium, it begins to hydrate. Large particles of Polygel K200 results in large lumps once in contact with aqueous medium and swell. The Polygel K200 should be added to non-aqueous medium to assure good dispersion, smallest particles size, before adding to aqueous medium to minimize lumps and have timely batch times. An acceptable practice is to add Polygel K200 to the fragrance and or nonionic surfactant with minimal mixing before adding to the aqueous medium. It is not necessary to use elevated temperatures in the formation step and room temperature is sufficient. 
     The instant compositions formulas explicitly exclude alkali metal sulfates, alkali metal silicates and alkali metal builders such as alkali metal polyphosphates, alkali metal carbonates, alkali metal phosphonates and alkali metal citrates because these materials, if used in the instant composition, would cause the composition to have a high pH as well as leaving residue on the surface being cleaned. 
     The following examples illustrate liquid light duty or toilet bowl cleaning compositions of the described invention. Unless otherwise specified, all percentages are by weight. The exemplified compositions are illustrative only and do not limit the scope of the invention. 
    
    
     EXAMPLE 1 
     The following toilet bowl cleaning formula in wt. % was made by simple mixing at 25° C. 
     
       
         
           
               
               
             
               
                   
                   
               
               
                   
                 A 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 C 12 —C 15  ethoxylated nonionic EO9:1 
                 3.5 
               
               
                   
                 Polygel K200 
                 0.9 
               
               
                   
                 Alkyl dimethyl benzyl ammonium chloride 
                 0.5 
               
               
                   
                 Perfume 
                 0.4 
               
               
                   
                 EDTA - tetrasodium salt 
                 0.12 
               
               
                   
                 Formaldehyde 
                 0.075 
               
               
                   
                 Water 
                 Bal. 
               
               
                   
                 Brookfield viscosity 
                 200 cps 
               
               
                   
                 pH 
                 7.0 
               
               
                   
                   
               
            
           
         
       
     
     EXAMPLE 2 
     The following formulas in wt. % were made by simple mixing at 25° C. 
     
       
         
           
               
               
               
               
             
               
                   
                   
               
               
                   
                 A 
                 B 
                 C 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 Cocoamidopropyl dimethyl amine oxide 
                 5.62 
                 5.62 
                 5.62 
               
               
                 Neodol 91-6 
                 15.17 
                 15.17 
                 15.17 
               
               
                 Benzalkonium chloride 
                 6.25 
                 — 
                 — 
               
               
                 Polygel K-200 
                 0.5 
                 0.5 
               
               
                 EDTA 
                 0.15 
                 0.15 
                 0.15 
               
               
                 Water 
                 57.82 
                 65.48 
                 65.98 
               
               
                 Brookfield viscosity at 25C at rpm, #21 
                 75 
                 50 
                 35 
               
               
                 spindle, 10 rpm 
               
               
                 pH 
                 7 
                 7 
                 7