MXPA03003711A - Detergent compositions for dental cleaning. - Google Patents

Abstract

The present invention refers to aqueous compositions of liquid detergent for hand teeth washing, which comprises an anionic surfactant and optionally one or more non-ionic surfactants, where at least 10% of the anionic surfactant includes a secondary alkane sulfonate. Said compositions optionally comprise a skin softening polymer, which preferably is a cationic polymer of the polyquaternium-type or a cationic guar derivative.

Description

COMPOSITIONS OF DETERGENT FOR MANUAL WASHING FIELD OF THE INVENTION The invention relates to liquid detergent compositions for manual washing. More specifically, the invention relates to such compositions that are gentle to human skin.

BACKGROUND OF THE INVENTION Liquid detergent compositions for manual washing, such as for washing dishes, are well known in the art. Many such commercially available formulations are based on anionic sulfate or sulfonate surfactants, such as, primary alkyl sulfates and alkyl benzene sulphonates frequently in conjunction with alkyl polyethoxy sulfate (alkyl ether sulfate). These surfactants are hard on human skin, which is a serious disadvantage, because the compositions are intended to come into frequent contact with the consumer's hands. In this way, softness in human skin is a desirable quality of the detergent compositions intended for manual washing. Therefore, in many products anionic surfactants are frequently replaced in part by non-ionic and / or zwitterionic surfactants that are less hard. Thus, long chain alkanol ethoxylates, betaines, amine oxides, ethanol amides and alkyl polyglycosides have been used in manual wash compositions, to increase softness while maintaining sufficient generation of foam.

Thus, EP 216301 and EP 341071 disclose dishwashing liquids by hand comprising ammonium surfactants, such as primary alcohol sulfates (PAS) and alkyl ether sulfates with nonionic and zwitterionic surfactants, such as APG, ethanolamide, betaine and / or amine oxide. Similar compositions are also described in W098 / 28392, in which case it also includes alkanolamine and a chelating agent, and in WO99 / 27062, in which case it also includes a thickening polymer. WO00 / 71658 and WO00 / 71652 describe compositions for manual washing which comprise, in addition to the surfactant, a "polymeric soap stabilizer", which may be a proteinaceous polymer or other polymer capable of having a cathode charge with a charge density of at least 1 unit per 100 Daltons of molecular weight at pH 4-12. WO95 / 00117 and WO98 / 47990 disclose liquid dishwashing detergent compositions, which contain branched primary alcohol and / or ethoxylated primary alcohol sulfates. It is said that they give good detergency, but no mention is made of their influence on human skin. US 6,362,147 discloses liquid dish washing compositions comprising low molecular weight organic diamines, such as 1,3 propane diamine, 1,6 hexane diamine, 1,3 pentane diamine and the like. These compounds are described to increase the removal of fat and give a feeling of softness to the skin. However, the need continues for compositions that give good detergency in manual washing operations and at the same time be gentle on the skin.

BRIEF DESCRIPTION OF THE INVENTION It has now been found that aqueous liquid detergent compositions for hand washing, in which part or all of the anionic detergent has been replaced by secondary alkane sulphonate surfactant, give improved smoothness to the skin while maintaining good foam and removal of greasy dirt. The softness can be further improved by adding a skin softness polymer. In this manner, the invention provides aqueous liquid detergent compositions for manual washing, comprising anionic surfactant and optionally nonionic and / or zwitterionic and / or amphoteric surfactant, in which at least 10% of the total anionic surfactant fraction consists of sulfonate of secondary alkane. Additionally, the invention provides liquid detergent compositions as noted above, which also comprise a skin softness polymer. In addition, the invention provides a process for washing dishes and cooking utensils which comprises treating dishes with liquid detergent compositions or an aqueous solution thereof.

Detailed description of the invention All percentages mentioned herein are by weight of the total composition unless otherwise specified. The aqueous liquid detergent compositions of the invention comprise a surfactant or surfactant mixture comprising at least one anionic surfactant. Of the total anionic surfactant at least 10% consists of secondary alkane sulphonate surfactant, preferably at least 20%, more preferably at least 25% or even 30%. Preferably, the compositions according to the invention comprise a mixture of surfactants, which in addition to anionic surfactant also comprises one or more non-ionic surfactants, zwitterionic surfactants and amphoteric surfactants (hereinafter collectively referred to as "non-ammonium surfactants") . The anionic surfactant fraction is preferably at least 10% of the surfactant mixture, more preferably at least 20% and even more preferably at least 25%. In this way, the corresponding amount of non-anionic surfactant is at most 90% of the surfactant mixture, more preferably when much 80% and even more preferably when much 75%. On the other hand, the maximum amount of anionic surfactant in the mixture is preferably 95%, more preferably 90%, even more preferably 85%. Additionally, the compositions according to the invention preferably comprise a skin softness polymer.

Anionic Surfactants As noted above, at least 10% of the anionic surfactant present in the surfactant mixture consists of water-soluble secondary alkane sulphonate salts. Suitable secondary alkane suifonates have 8-22 carbon atoms in the alkyl chain, preferably 10-20 carbon atoms. Suitable cations are those of alkaline or alkaline earth metals, ammonia and alkanol amines. The remainder of the anionic surfactant fraction will comprise anionic surfactants known in the art, in particular those which are water soluble salts of organic sulfuric acid monoesters and sulfonic acids having in the molecular structure a straight or branched chain alkyl group containing 8-22 carbon atoms or an alkylaryl group containing 6-20 carbon atoms in the alkyl part. Examples of such anionic surfactants are water-soluble salts of: long-chain alcohol sulfates (ie, 8-22 carbon atoms) (hereinafter referred to as PAS), especially those obtained by sulfating the fatty alcohols produced from tallow or coconut oil or synthetic alcohols derived from petroleum; alkylbenzene suifonates, such as those in which the alkyl group contains from 6 to 20 carbon atoms; Also suitable are the salts of: alkylglyceryl ether sulfates, especially the ethers of fatty alcohols derived from tallow and coconut oil; - monoglyceride sulfates of fatty acids; - suiphates of ethoxylated aliphatic alcohols containing 1-12 ethyleneoxy groups; alkylphenol ethyleneoxy ether sufates with from 1 to 8 ethyleneoxy units per molecule and in which the alkyl groups contain from 4 to 14 carbon atoms; - the reaction product of fatty acids esterified with isethionic acid and neutralized with alkali.

However, it is preferred that the anionic surfactant fraction does not contain any alkylbenzene sulfonate surfactant. It is even more preferred that the only ammonium surfactants other than sec.alkane sulfonate (if at all) are suiphates of ethoxylated aliphatic alcohols (alkyl ether suifatos) containing 1-12 ethyleneoxy groups. However, it is well known that such ether suifatos may contain minor amounts of alkyl suifatos left over from the production process.

Non-anionic surfactant In the preferred embodiments of this invention, which also comprise non-anionic surfactant, these surfactants can be chosen from a wide range of surfactants known in the art.In this way, a suitable class of nonionic surfactants can be broadly described as compounds produced by the condensation of simple alkylene oxides, which are hydrophilic in nature, with an aliphatic or alkyl-aromatic hydrophobic compound having a reactive hydrogen atom . The length of the hydrophilic or polyoxyalkylene chain that is attached to any particular hydrophobic group can be easily adjusted to produce a compound having the desired balance between hydrophobic and hydrophobic elements. This allows the choice of non-ionic surfactants with the correct HLB. Particular examples include: the condensation products of aliphatic alcohols having from 8 to 22 carbon atoms in either straight or branched chain configuration with ethylene oxide, such as ethylene oxide condensates of coconut alcohol having from 2 to 15 moles of ethylene oxide per mole of coconut alcohol; - condensates of alkylphenols having C6-C15 alkyl groups with 5 to 25 moles of ethylene oxide per mole of alkylphenol; - condensates of the reaction product of ethylene diamine and propylene oxide with ethylene oxide, the condensates containing from 40 to 80% of ethyleneoxy groups by weight and having a molecular weight from 5,000 to 11,000.

Other classes of non-ionic surfactants are: alkyl polyglycosides, which are condensation products of long-chain aliphatic alcohols and saccharides; - tertiary amine oxides of structure RRRNO, where one R is an alkyl group of 8 to 20 carbon atoms and the other R are each alkyl or hydroxyalkyl groups of 1 to 3 carbon atoms, for example, dimethyldodecylamine oxide; - fatty acid alkylolamides, such as ethanol amides; - alkylene oxide condensates of fatty acid alkylolamides.

A specific group of surfactants are the tertiary amines obtained by condensation of ethylene oxide and / or propylene with long chain aliphatic amines. The compounds behave as non-ionic surfactants in an alkaline medium. Particularly preferred are the condensation products of aliphatic alcohol / ethylene oxide, in which the alkyl chain has 8-18 carbon atoms, the amine oxides in which the long alkyl chain has 9-18 carbon atoms and the alkyl polyglycosides comprise an average of 1-2.5 glycoside units per molecule. Suitable zwitterionic surfactants can be found among derivatives of aliphatic quaternary ammonium compounds, sulfonium and phosphonium having an aliphatic group of 8 to 18 carbon atoms and an aliphatic group substituted by an anionic group solubilizing in water, for example: 3- (N, N-dimethyl-N-hexadecylammonium) -propane-1-sulfonate betaine, 3- (dodecylmethyl-sulfonium) -propane-1-sulfonate betaine and 3- (cetylmethyl-phosphonium) -ethanesulfonate betaine. Other well-known betaines are the alkylamidopropyl betaines, for example, those wherein the alkylamido group is derived from fatty acids of coconut oil. Additional examples of suitable surfactants can be found in the well-known textbooks "Surface Active Agents", vol. 1, by Schwartz & Perry, Interscience 1949, vol. 2 by Schwartz, Perry & Berch, Interscience 1958, in the current issue of "McCutcheon's Emulsifiers and Detergents" published by Manufacturing Confectioners Company or in "Tenside-Taschenbuch", H. Stache, 2nd ed., Carl Hauser Verlag, 1981 Skin softness polymer The optional skin softness polymer is preferably present in an amount of up to 5%, more preferably at most 1%, most preferably at most 0.5% of the total composition. Preferably, at least 0.01%, more preferably at least 0.05% is used. The polymers useful in the present invention as skin softness polymers are cationic, anionic, amphoteric and nonionic polymers used in the cosmetic field. They are also sometimes referred to as skin deposition polymers and generally have a molecular weight between 20,000 and 10,000,000, preferably between 100,000 and 5,000,000, more preferably above 300,000. Preferably, the polymers are cationic, in which case the positive charge is generally due to the presence of quaternary ammonium groups. Non-limiting examples of such polymers are described in CTFA Cosmetic Ingredient Dictionary (The Cosmetic Ingredient Dictionary of CTFA) (The Cosmetic, Toiletry, and Fragrance Association, Inc., Washington D.C.). Examples of suitable polymers are synthetic polymers, such as those classified by the CTFA in the range of Polyquaternium, for example, Polyquaternium-6, -7, -11 and -16. Other suitable polymers are starch derivatives and cationic cellulose, which can also be classified in the range of Polyquaternium, such as Polyquaternium-10 and -24. Other cationic polymers that can be used with cationic guar derivatives, such as guar hydroxypropyltrimonium chloride.

Additional ingredients The compositions according to the present invention can include other conventional ingredients, such as smaller amounts of formers, electrolytes, such as sodium or ammonium chlorides and Ca or Mg salts, coloring agents, aperlerants, opacifiers, perfumes, preservatives and the like. The compositions may also include pH regulating components, such as acids, suitable bases and buffering combinations thereof. The alkanolemines can be suitably added to provide an alkaline pH and at the same time improve the cleaning properties. It has been found beneficial to further improve the softness of the compositions according to the invention to include up to 2% of one or more amino acids, in particular naturally occurring amino acids, more particularly basic amino acids, such as arginine, lysine and histidine. Preferably, these are added in an amount of 0.001-2% of the total composition. Lysine is the most preferred amino acid for this purpose. Other ingredients that are known in the art for their skin care properties may also be added. The compositions according to the invention generally have pH between 5 and 10. The compositions for manual washing are generally formulated at pH between 5.5, and 7.5, in order to minimize the adverse reaction with the skin. However, the higher pH is beneficial for cleaning. The detergent compositions according to the invention are mild to the skin, even at higher pH and can be formulated above 7.5, preferably between 8 and 9.5, or even between 8.5 and 9.5. The compositions according to the invention are suitable for manual washing of a wide variety of substrates, such as various kinds of hard surfaces, laundry and the like. They are particularly suitable for washing dishes and cooking utensils. For this purpose, the compositions can be applied directly to the substrate, after which the substrate is cleaned and rinsed with water. Alternatively, the compositions are well suited for use as dilute aqueous solutions, in which the substrate is submerged to be cleaned. The total amount of surfactant in the composition depends very much on the user's preference and the intended use. Some consumers prefer to use a large amount of product, in which case the amount of surfactant in the composition may be relatively low, while other consumers prefer to use a small amount of a concentrated product. In general, the amount of surfactant in the product is conveniently between 1 and 60%, preferably between 5 and 50%. The invention will be further illustrated by the following examples: EXAMPLES The following liquid dishwashing compositions were prepared: Compositions I II Na iauret sulphate 8.0% 8.0% Na dodecylbenzene sulfonate 5.0% Hostapur SASMR *) 5.0% Cocamidopropyl betaine 4.0% 4.0% Treitanolamine 1.0% 1.0% Jaguar C13MR **) 0.1% Tetra-acetate of ethylene-diamine 0.06% 0.06% Benzisothiazolinone 0.02% 0.02% Oparant 0.25% 0.25% Perfume 0.20% 0.20% Colorant 0.002% 0.002% Water 100% 100% *) Na C-H-Ciy sec. alkyl sulfonate marketed by Clariant **) Guar hydroxypropyltrimonium chloride marketed by Rhodia In several comparative tests involving in vitro as well as in vivo tests, it was found that composition II, which is in accordance with the invention, is much milder for human skin than composition I.

Claims (11)

1. Aqueous compositions of liquid detergent for manual washing comprising a mixture of surfactants, which comprises at least 10-95% by weight of the surfactant mixture of the total anionic surfactant and 5-90% by weight of the surfactant mixture of non-anionic surfactant total, characterized in that at least 10% by weight of the total anionic surfactant fraction consists of secondary alkane sulfonate salts.

2. Aqueous liquid detergent compositions according to claim 1, characterized in that the amount of secondary alkane sulphonate salts is at least 20% by weight of the total anionic surfactant fraction.

3. Aqueous liquid detergent compositions according to claim 2, characterized in that at least 25% by weight of the total anionic surfactant fraction consists of secondary alkane sulphonate salts.

4. Aqueous liquid detergent compositions according to claims 1-3, characterized in that the total anionic surfactant fraction is 25-75% by weight of the surfactant mixture.

5. Aqueous liquid detergent compositions according to claims 1-4, characterized in that the compositions additionally contain 0.01-5% by weight of the composition of a skin softness polymer.

6. Aqueous liquid detergent compositions according to claim 5, characterized in that the amount of skin softness polymer is 0.05-1% by weight of the composition.

7. Aqueous liquid detergent compositions according to claims 5-6, characterized in that the skin softness polymer is a cationic polymer.

8. Aqueous liquid detergent compositions according to claim 7, characterized in that the skin softness polymer is a polymer of the range of polyquaternium or a cationic guar derivative.

9. Aqueous compositions of liquid detergent according to claims 1-8, characterized in that the compositions additionally contain up to 2% of an amino acid.

10. Aqueous compositions of liquid detergent according to claim 9, characterized in that the amino acid is a basic amino acid.

11. The process for washing dishes and kitchen utensils, characterized in that they are treated with a composition according to any of claims 1-10.