MXPA97007872A - Auxiliary rubber compositions, improved, containing certain polymers of acrylic acid, of molecular weight b - Google Patents

Abstract

This invention refers to a composition and method to improve the performance, in hard water, of a rinse aid added certain polymers of acrylic acid, low molecular weight

Description

IMPROVED RUBBING COMPOSITIONS, IMPROVED, CONTAINING CERTAIN POLYMERS OF ACRYLIC ACID, OF LOW MOLECULAR WEIGHT FIELD OF THE INVENTION This invention relates to a composition and method for improving the operation, in hard water, of an axial rinsing by adding certain polymers of acrylic acid, of low molecular weight.

BACKGROUND OF THE INVENTION Auxiliary rinsing formulations are aqueous solutions containing nonionic surfactants which favor the rapid drying of water in the dishes and reduce the formation of stains and film. In hard water conditions, surfactants alone will not prevent film formation. It is known that acrylic acid polymers can improve the performance of detergent compositions by inhibiting the deposition of mineral salts that contribute to the formation of film in the dishes. Patent EP0308221B1 discloses a composition containing a nonionic surfactant with low foaming power, a polymer of acrylic acid of molecular weight from 1000 to 25,000, and an additional nonionic surfactant having a cloud point of at least 70 ° C and which serves as a stabilizer, the present invention differs from the description in EP 308,221 because the stabilizing surfactant is not necessary and only certain polymers specific for acrylic acid are useful. U.S. Patent No. 4,678,596 (596) discloses an axial rinsing composition containing a non-ionic surfactant with low foaming power, a low molecular weight poly (meta) acrylic acid and a stabilizing, methacrylic acid polymer of molecular weight . US Patent * 596 shows that "there is a major obstacle in the use of low molecular weight polyacrylic acids in the rinse axils due to the incompatibility of these polymers in the aqueous formulations of rinse aids containing low-power surfactants See 596 in column 2, lines 10-25. Surprisingly, applicants have discovered that the addition of certain low molecular weight acrylic acid polymers drastically reduces the formation of films, in the dishes, under water conditions hard, and the composition requires a high cloud point nonionic surfactant or a high molecular weight compatibilizing polymer for stability.

SUMMARY OF THE INVENTION An auxiliary rinsing composition having improved stain and film reducing properties comprises: a. 0 to 90% of hydrotropes; b. 5 to 95% of nonionic surfactants with low foaming power c. 0.1 to 10% of an acrylic acid polymer having a molecular weight around 500-2500. A method for reducing stain and film formation in the dishes comprises: contacting the dishes with an auxiliary rinsing composition containing: a. 0 to 90% of hydrotropes; b. 5 to 95% of nonionic surfactants with low foaming power c. 0.1 to 10% of an acrylic acid polymer having a molecular weight around 500-2500.

DESCRIPTION OF THE INVENTION An auxiliary rinsing composition having improved stain and film reducing properties comprises: a. 0 to 90% of hydrotropes; b. 5 to 95% of nonionic surfactants with low foaming power; c. 0.1 to 10% of an acrylic acid polymer having a molecular weight around 500-2500. A method for reducing stain and film formation in the dishes comprises: contacting the dishes with an auxiliary rinsing composition containing: a. 0 to 90% of hydrotropes; b. 5 to 95% of nonionic surfactants with low foaming power; c. 0.1 to 10% of an acrylic acid polymer having a molecular weight around 500-2500.

Preparation of the rinse aid compositions of the present invention The rinse aids of the present invention are prepared by combining hydrotropes, nonionic surfactants with low foaming power, polycarboxylate polymers and alkyl iminoadialkanoate, according to methods known to those skilled in the art. The technique.

Hydrotropes The compositions of the present invention contain hydrotropes. Hydrotropes useful in the present invention include, but are not limited to, sodium xylene sulfonate, sodium eumeno sulfonate, ethylene glycol, propylene glycol, sodium diethyl sulfonate and short chain alkyl sulfates. U.S. Patent 3,563,901 and U.S. Patent 4,443,270 describe useful hydrotropes and are incorporated herein by reference. Sodium diethyl sulfosuccinate is a particularly preferred hydrotrope. The hydrotropes are present in a concentration of 0.1 to 90% by weight, preferably in a concentration of 1 to 80% by weight and more preferably, a concentration of 10 to 60% by weight. Surfactants Nonionic surfactants with low foaming power The auxiliary rinse compositions of the present invention contain non-ionic surfactants with low foaming power in concentrations of about 5 to 95% by weight, preferably about 5 to 60% by weight; more preferably about 10 to 40% by weight. Nonionic surfactants can be broadly defined as surface active compounds that do not contain ionic functional groups. An important group of chemical substances within this class are those that are produced by the condensation of the alkylene oxide groups (hydrophilic nature) with an organic hydrophobic compound; the latter is aliphatic or alkyl aromatic in nature. The length of the hydrophilic or polyoxyalkylene radical that is condensed with any particular hydrophobic group can be easily adjusted to produce a water soluble compound having the desired degree of balance between the hydrophilic and hydrophobic elements. Illustrative, but not limiting examples of the different chemical types of suitable nonionic surfactants include: (a) Polyoxyethylene or polyoxypropylene condensates of basic, straight or branched carboxylic acids, saturated or unsaturated, containing about 8 to about 18 carbon atoms in the aliphatic chain and that incorporate from 5 to about 50 units of ethylene oxide or propylene oxide. Suitable carboxylic acids include "coconut" fatty acids (derived from coconut oil) containing an average of about 12 carbon atoms, "bait" fatty acids (derived from fats of the bait class) containing a average of around 18 carbon atoms, palmitic acid, myristic acid, stearic acid and lauric acid. (b) Polyoxyalkylene (polyoxyethylene or polyoxypropylene) condensates of aliphatic, straight or branched chain alcohols, saturated or unsaturated, containing from about 8 to about 24 carbon atoms and incorporating from about 5 to about 50 units of ethylene oxide or propylene oxide. Suitable alcohols include the "coconut" fatty alcohols, "bait" fatty alcohols, lauryl alcohol, myristyl alcohol, and oleyl alcohol. The surfactant INDUSTROL® D 5 is a preferred condensate of an aliphatic alcohol. The surfactant INDUSTROL® D 5 is available from BASF Corporation, Mt. Olive, New Jersey. (c) Polyoxyalkylene (polyoxyethylene or polyoxypropylene) concatenates of alkyl phenols, straight or branched chain, saturated or unsaturated, containing from about 6 to about 12 carbon atoms and incorporating from about 5 to about 25 moles of ethylene oxide or propylene oxide. (d) Particularly preferred nonionic surfactants are selected from the block copolymers of the polyalkylene oxide. This class may include polypropoxylated polyethoxylated propylene glycol sold under the trade name "PLURONIC®" made by BASF Corporation or the polyethoxylated polyethoxylated ethylene glycol sold under the tradename "PLURONIC-R®" made by BASF Corporation, Mt. Olive , New Jersey. The first group of compounds is formed by condensing ethylene oxide with a hydrophobic base formed by the condensation of a propylene oxide with propylene glycol (see US Pat. No. 2)., 674,619). The hydrophobic portion of the molecule which, of course, has insolubility in water, has a molecular weight from about 1500 to 1800. The addition of the polyoxyethylene radicals to this hydrophobic portion tends to increase the water solubility of the molecule as a all and the liquid character of the product is maintained to the point where the content of the polyoxyethylene is about 50% of the total weight of the condensation product. This last series of compounds known as "PLURONIC-R®" are formed by condensing propylene oxide with the polyethoxylated ethylene glycol condensate. This series of compounds is characterized by having an average molecular weight of between about 2000 and 9000 consisting of, by weight, from about 10 to 80 percent polyoxyethylene and a portion of polyoxypropylene having a molecular weight between about 1000 and 3100 US Patents 4,366,326; 4,624,803; 4,280,919; 4,340,766; 3,956,401; 5,200,236; 5,425,894; 5,294,365; which are incorporated herein by reference, describe in detail the nonionic surfactants useful in the practice of this invention. Finally, Surfactant Science Series, edited by Martin J. Schick: Nonionic Surfactants, volumes 19 and 23 provide the detailed description of nonionic surfactants and are incorporated herein by reference.

Other surfactants useful in the compositions of the present invention The rinse aid compositions in the present invention may also have surfactants which are selected from the group of organic surfactants consisting of anionic, cationic, amphoteric surfactants and mixtures thereof. These other surfactants are present in a concentration of about 0 to 100% by weight, preferably, about 1 to 80% by weight, more preferably, about 5 to 60% by weight. The surfactants useful herein are listed in U.S. Patent No. 4,396,520 to Payne et al. , filed on August 2, 1983, US Patent No. 3,664,961 by Norris, filed May 23, 1972 and US Patent No. 3,919,678 by Laughlin et al., filed December 30, 1975, each which is incorporated herein by reference. Useful cationic surfactants also include those described in U.S. Patent No. 4,222,905 to Cockrell, filed September 16, 198, and U.S. Patent No. 4,239,659 to Murphy, filed December 16, 1980, both incorporated in the present as a reference. Useful anionic surfactants include water-soluble salts, preferably alkali metal, ammonium and substituted ammonium salts, of reaction products of organic sulfuric acid having in their molecular structure an alkyl group from about 10 to about 20. carbon atoms and a sulfonic acid or ester group of sulfuric acid. (Included in the term "alkyl" is the alkyl portion of the acyl groups.) Examples of this group of synthetic surfactants are the sodium and potassium alkyl sulfates, especially those which are obtained by sulfation of higher alcohols (carbon atoms of (Ca-is) such as those produced by reducing the glycerides of bait or coconut oil, and the sodium and potassium alkylenbenzenesulfonates in which the alkyl group contains from about 9 to about 15 carbon atoms in straight chain or branched chain configuration, for example, those of the type described in U.S. Patent Nos. 2,220,099 and 2,477,383 both of which are incorporated herein by reference.Right straight chain alkyl benzene sulphonates are especially valuable [ sic] in which the average number of carbon atoms in the alkyl group is from 11 to 13, abbreviated as Cn-? 3LAS Other suitable anionic surfactants for use in The present are sodium alkyl diphenyl ether sulfonates, especially those ethers of higher alcohols derived from bait and coconut oil; the monoglyceride sulfonates and sulphates of the fatty acids of coconut oil; the sodium or potassium ether sulfates of the alkyl phenol ethylene oxide containing from about 1 to about 10 ethylene oxide units per molecule and from about 8 to about 12 carbon atoms in the alkyl group; and the sodium or potassium salts of the alkyl ether sulfates of ethylene oxide containing from about 1 to about 25 ethylene oxide units per molecule and from about 10 about 20 carbon atoms in the alkyl group. Other useful anionic surfactants include the water-soluble salts of the esters of the alpha-sulfonated fatty acids containing from about 6 to 20 carbon atoms in the fatty acid group and from about 1 to 10 carbon atoms in the ester group; the water-soluble salts of the 2-acyloxy-alkane-sulfonic acids containing from about 9 to about 23 carbon atoms in the alkyl group and from about 8 to 20 carbon atoms in half. Particularly preferred surfactants of the present invention are anionic surfactants which are selected from the group consisting of alkali metal salts of Cn-? 3 alkyl benzene sulphonates, alkyl sulphates of linear C 12 -8 alkyl polyethoxysulfates which contain from about 1 to about 10 moles of ethylene oxide and mixtures thereof, and nonionic surfactants which are the condensation products of the alcohols having an alkyl group containing from about 9 to about 15 carbon atoms with from about 4 to about 12 moles of ethylene oxide per mole of alcohol. Cationic surfactants, useful in the practice of the present invention, comprise a wide variety of compounds that are characterized by one or more organic hydrophobic groups in the cation and, generally, by a quaternary nitrogen associated with the acid moiety. Compounds with quaternary nitrogen also include cyclic nitrogen-containing compounds. Suitable anions are halides, methyl sulfate and hydroxide. Tertiary amines may have characteristics similar to cationic surfactants in washing solutions with pH values lower than about 8.5. A more complete description of cationic surfactants can be found in U.S. Patent No. 4,228,044 filed October 14, 1980, by Cambre, this patent is incorporated herein by reference. Amphoteric surfactants, useful in the practice of the present invention, include derivatives of heterocyclic secondary and tertiary amines in which the aliphatic portion can be straight or branched chain and wherein one of the aliphatic substituents contains from about 8 to 18 carbon atoms and at least one aliphatic substituent contains an anionic water-solubilizing anhydride group of low molecular weight acrylic acid The rinse aid compositions of the present invention contain low molecular weight acrylic acid polymers. Specifically, the polymers useful in the practice of the present invention are partially neutralized, low molecular weight acrylic acid polymers, having a preferred molecular weight range of about 500 to 2500, more preferably about 500 to 2000, and more preferably about 500 to 1500. Preferably, the polymers of the low molecular weight acrylic acrylic are used at levels of 0.1 to 10% by weight, more preferably 1 to 10% by weight and more preferably 2 to 6% by weight.

The utility of the present invention the following non-limiting examples illustrate the utility of the present invention compared to the prior art compositions.

Example 1 No rinsing additive was used Example 2 A commercial rinsing auxiliary composition which was considered to contain at least one block polymer of ethylene oxide and propylene oxide. Example 3 A commercial rinsing aid composition which was considered to contain at least one polyoxyalkylene condensate of an aliphatic alcohol. Example 4 (the present invention) The composition of Example 2 with 5% by weight of a partially neutralized 1000 molecular weight acrylic acid polymer. Example 5 The composition of Example 2, with 5% by weight of a polymer of acrylic acid of molecular weight 1200, neutralized.

Example 6 The composition of Example 2, with 5% by weight of a polymer of acrylic acid of molecular weight 8000, partially neutralized. Example 7 The composition of Example 2, with 5% by weight of a polymer of acrylic acid of molecular weight 7000, partially neutralized Example 8 (the present invention) The composition of Example 3, with 5% by weight of a polymer of acrylic acid of molecular weight 1000, partially neutralized. The stability and effectiveness of the rinse aid compositions were evaluated in terms of reducing the formation of stains and film on glassware in a domestic dishwashing machine.

Evaluation of stain and film formation Detergent composition: 38% Sodium hexahydrated tripolyphosphate 20% Sodium carbonate 20% Sodium metasilicate 22% Sodium sulfate Fatty dirt: 72% Margarine 18% Milk powder 5% Lard 5% Clarified beef bait Five glasses were evaluated after 3 washing / rinsing cycles using water with a hardness of 250 ppm.

Cycle 1: 20 g of detergent per wash, 25 g of dirty dirt in the prewash, 1 ml of rinse aid in the second rinse. Cycle 2: cycle 1 is repeated, 12 g of milk powder is added to the main wash. Cycle 3: cycle 1 is repeated, 15 g of egg are added in the main wash.

The vessels were visually classified on a scale from 1 (no spots or film) to 5 (full coverage of spots and films).

Example Stability Stain and film formation 1 N / A 4.5 2 N / A 4.5 3 N / A 4.5 4 stable 2.5 5 unstable 2.5 6 unstable 4.2 7 unstable 4.0 8 stable 2.5 In conclusion, the auxiliary rinsing compositions of the present invention (examples 4 and 8) are effective in reducing staining and filming of the glass material under hard water conditions and do not require additional surfactants and / or polymers to provide stability.

Claims (1)

1. CLAIMS An auxiliary rinsing composition having improved stain and film reducing properties comprising: a. 0 to 90% of hydrotropes b. 5 to 95% of nonionic surfactants with low foaming power c. 0.1 to 10% of an acrylic acid polymer having a molecular weight around 500-2500. A method for reducing stain and film formation in the dishes, comprising contacting the dish with an auxiliary rinsing composition containing: a. 0 to 90% of hydrotropes b. 5 to 95% of nonionic surfactants with low foaming power c. 0.1 to 10% of an acrylic acid polymer having a molecular weight around 500-2500. The auxiliary rinsing composition according to claim 1, wherein the acrylic acid polymer (c) has a molecular weight of about 500 to 2000. The rinse aid composition according to claim 1, wherein the Acrylic acid polymer (c) has a molecular weight of about 500 to 1500. The method according to claim 2, wherein the polymer of acrylic acid (c) has a molecular weight of about 500 to 2000. The method, according to claim 2, wherein the polymer of acrylic acid (c) ) has a molecular weight of about 500-1500.