Detergent composition containing zeolite map for washing a mixtu

Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...

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Details

510301, 510324, 510325, 510337, 510394, 510507, C11D 312, C11D 328

Patent

active

059359226

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a detergent composition and, in particular, to improvements in the detergency performance of laundry detergent compositions comprising zeolites as a sequestering agent for water hardness.


BACKGROUND

Detergent compositions for heavy-duty fabric washing conventionally contain detergency builders which lower the concentration of calcium and magnesium water hardness ions in the wash liquor and thereby provide good detergency effect in both hard and soft water.
Conventionally, inorganic phosphates, such as sodium tripolyphosphate, have been used as builders for laundry detergents. More recently, alkali metal aluminosilicate ion-exchangers, particularly crystalline sodium aluminosilicate zeolite A, have been proposed as replacements for the inorganic phosphates.
For example, EP 21 491A (Procter & Gamble) discloses detergent compositions containing a building system which includes zeolite A, X or P (B) or a mixture thereof. EP 384070A (Unilever) discloses specific zeolite P materials having an especially low silicon to aluminium ratio not greater than 1.33 (hereinafter referred to) as zeolite MAP) and describes its use as a detergency builder. To date, however, zeolite A is the preferred aluminosilicate detergency builder in commercially available products.
EP 384070 (Unilever) suggests that zeolite MAP has certain advantages over zeolite A as a detergency builder. However, we have found that compositions containing zeolite MAP as detergency builder can result in poorer fabric whiteness, as compared with compositions containing zeolite A as detergency builder, in washing loads containing a mixture of coloured and white fabrics.


SUMMARY

Surprisingly, we have found that zeolite MAP gives good fabric whiteness performance when used in combination with specific fabric whitening agents and/or specific polymeric materials and/or with an oxidative catalyst.
Thus, the present invention provides a detergent composition comprising: zwitterionic detergent-active compounds and mixtures thereof; ratio not greater than 1.33 (zeolite MAP); and N-vinylpyrrolidone and N-vinylimidazole, polyvinylpyrrolidone polymers, polyvinyloxazolidones, polyvinylimidazoles or mixtures thereof; and


DETAILED DESCRIPTION

The detergent composition according to the invention may be of any physical type, for example powders, liquids and gels. However, granular and liquid compositions are preferred.
Preferably the detergent composition according to the present invention contains no bleach.
The detergent composition according to the invention contains, as an essential ingredient, one or more surfactants selected from anionic, nonionic, cationic, amphoteric and zwitterionic detergent-active compounds and mixtures thereof. Such surfactants are well known and described in the literature, for example, in "Surface-Active Agents and Detergents", Volumes I and II by Schwartz, Perry and Berch.
Examples of suitable anionic surfactants include alkylbenzene sulphonates, particularly sodium linear alkylbenzene sulpionates having an alkyl chain length of C.sub.8 -C.sub.15 ; C.sub.12 -C.sub.15 primary alkyl sulphates; olefin sulphonates; alkyl xylene sulphonates; dialkyl sulphosuccinates; and fatty acid ester sulphonates. Sodium salts are generally preferred.
Examples of suitable nonionic surfactants include alkoxylated adducts of fatty alcohols containing an average of from 3 to 10 alkylene oxide groups per molecule.
A particularly preferred aliphatic alcohol ethoxylate is a primary alcohol having an average of from 12 to 15 carbon atoms in the alkyl chain condensed with an average of from five to seven ethoxy groups per mole of alcohol.
Other examples of suitable alkoxylated adducts of fatty alcohols are Synperonic A3 (ex ICI), which is a C.sub.13 -C.sub.15 alcohol with about three ethylene oxide groups per molecule and Empilan KB3 (ex Marchon), which is lauric alcohol 3EO. Mixtures of such ethoxylated alcohols are also contemplated by the present invention.
Another class of nonionic surfactants comprises

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