Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1998-03-04
1999-12-14
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
510360, 510361, 510476, C11D 1700
Patent
active
060017988
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the use of modified polyaspartic acids in detergents and to detergents which contain the modified polyaspartic acids in amounts of from 0.1 to 20% by weight.
EP-A-0 454 126 discloses detergents which contain 10 to 40% by weight of a surfactant, 5 to 50% by weight of at least one sodium aluminum silicate, 0.5 to 70% by weight of at least one conventionally used additive and 5 to 50% by weight of at least one polyamino acid, preferably polyaspartic acid or polyglutamic acid, as organic cobuilder. Hompolymers of aspartic acid as ingredient of modern detergent formulations are disclosed, for example, in WO-A 94/14939 and WO-A 94/10282. Polyaspartic acid improves the soil release capacity of granular detergents.
WO-A 95/16020 discloses the use of polyaspartic acid which has been prepared by polycondensation of aspartic acid in the presence of phosphoric acid in a molar ratio of from 1:0.05 to 1:10 at temperatures of at least 120.degree. C. to give polysuccinimide and subsequent hydrolysis of the polysuccinimide with bases to give at least partially neutralized polyaspartic acid, as additive to detergents and cleaners in amounts of from 0.1 to 10% by weight. The polyaspartic acids prepared in this way have the advantage, compared with polyaspartic acids which can be prepared by other processes, that they have considerably better biodegradability.
WO-A 94/01486 discloses modified polyaspartic acids obtainable by polycondensation of aspartic acids with fatty acids, polybasic carboxylic acids, anhydrides of polybasic carboxylic acids, polybasic hydroxy carboxylic acids, monobasic polyhydroxy carboxylic acids, alcohols, amines, alkoxylated alcohols and alkoxylated amines, aminosaccharides, carbohydrates, sugar carboxylic acids and/or non-proteinogenous amino carboxylic acids. The modified polyaspartic acids are used as additive to reduced-phosphate and phosphate-free detergents and cleaners, as water-treatment agent and as scale inhibitor in the evaporation of sugar juice.
Although the polyaspartic acids described above confer dispersant properties on the detergent formulations, they do not, on use of the same amount, achieve the same encrustation-inhibiting effect of commercial polymeric cobuilders such as copolymers of acrylic acid and maleic acid with an average molecular weight of 70,000 or of polymaleic acids with a molecular weight of from 1000 to 3000.
It is an object of the present invention to provide an organic cobuilder based on polyaspartic acid which is an improvement compared with the prior art.
We have found that this object is achieved by using modified polyaspartic acids obtainable by polycondensation of aspartic acid in the presence of, in each case based on the aspartic acid employed, hypophosphorous acid, polyphosphoric acids, phosphorus pentoxide, phosphonic acids or mixtures of said acids, bases to give modified polyaspartic acids with a phosphorus content of from 0.5 to 10% by weight, as additive to detergents.
The invention additionally relates to detergents which comprise at least one surfactant and an organic cobuilder and, where appropriate, other conventional ingredients, where the detergents comprise as organic cobuilder 0.1 to 20% by weight of a modified polyaspartic acid obtainable by polycondensation of aspartic acid in the presence of, in each case based on the aspartic acid employed, hypophosphorous acid, polyphosphoric acids, phosphorus pentoxide, phosphonic acids or mixtures of said acids, bases to give modified polyaspartic acids with a phosphorus content of from 0.5 to 10% by weight.
The modified polyaspartic acids to be employed according to the invention as organic cobuilder in detergents can be prepared, for example, by polycondensation of D- or DL-aspartic acid with the compounds indicated above under (a) and (b). Suitable compounds of component (a) are amines with at least 6 carbon atoms. These amines are preferably primary and/or secondary C.sub.8 -C.sub.22 -alkylamines. Preferred secondary alkylamines are those compounds in which at least one alky
REFERENCES:
patent: 5656646 (1997-08-01), Perner et al.
patent: 5747635 (1998-05-01), Kroner et al.
patent: 5770553 (1998-06-01), Kroner et al.
Baur Richard
Bertleff Werner
Funhoff Angelika
Jager Hans-Ulrich
Kroner Matthias
BASF - Aktiengesellschaft
Gupta Yogendra
Ingersoll Christine E.
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