Polycocondensates based on aspartic acid, their preparation and

Details Polycocondensates based on aspartic acid, their preparation and Polycocondensates based on aspartic acid, their preparation and

1995-09-13

1996-11-12

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253299, 562565, 562590, 252180, 510476, 510361, C08F 830, C08F 2062, C08F 2066

Patent

active

055741134

DESCRIPTION:

BRIEF SUMMARY
The invention relates to polycocondensates based on aspartic acid, which are obtainable by condensing aspartic acid in the presence of polymers containing carboxyl groups, processes for preparing the polycocondensates and the use of the polycocondensates as an additive to detergents and cleaners, as scale inhibitors or as dispersants for finely divided solids.
U.S. Pat. No. 3,634,543 discloses grafting copolymers of olefins having 2 to 4 carbon atoms, containing from 1 to 50 mol % of acrylic acid or methacrylic acid, with caprolactam.
WO-A-92/11297 discloses reacting copolymers of .alpha.-olefins and monoethylenically unsaturated carboxylic acids having molecular weights from 500 to 6,000 with .omega.-aminocarboxylic acids. The reaction products have an excellent compatibility with other polymers, in particular with polyamides.
EP-A-0 452 696 discloses aqueous solutions or dispersions of hydroxy-functional copolymers containing imide structural units, which are prepared, for example, by reacting copolymers containing anhydride groups or, if appropriate, carboxyl groups with aminoalcohols with imide formation at temperatures from 100.degree. to 200.degree. C., removing the water of reaction by azeotropic distillation and dissolving the polymer solution in water or dispersing it after at least partial neutralization of the carboxyl groups and, if appropriate, partially or completely removing organic solvent which is still present by azeotropic distillation. The hydroxy-functional copolymers are used for the preparation of coating compositions, sealing compositions or adhesives.
It is an object of the present invention to make available novel substances. A further object of the invention is to indicate novel additives for use in detergents and clenaers and to make available novel scale inhibitors and dispersants.
We have now found that these objects are achieved by polycondensates based on aspartic acid, which are obtainable by condensing (a) aspartic acid or polyaspartic acid in the presence of (b) polymers containing carboxyl groups, which contain at least 10 mol % of a monoethylenically unsaturated carboxylic acid in copolymerized form and have a molecular weight of at least 300, or of copolymers containing maleic anhydride groups in the weight ratio (a):(b) from 1,000:1 to 2:1.
The object is additionally achieved by a process for preparing polycondensates based on aspartic acid when (a) aspartic acid or polyaspartic acid is condensed in the presence of (b) polymers containing carboxyl groups, which contain at least 10 mol % of a monoethylenically unsaturated carboxylic acid in copolymerized form and have a molecular weight of at least 300, or of copolymers containing maleic anhydride groups in the weight ratio (a) to (b) from 1,000:1 to 2:1.
The last-mentioned objects are achieved by the use of the polycocondensates in the form of the free acid groups or in a form neutralized with ammonia, amines, alkali metal or alkaline earth-metal bases as an additive to detergents and cleaners, as scale inhibitors or as dispersants for finely divided solids.
Components (a) which can be used for preparing the polycocondensates are L-, D- and DL-aspartic acid. DL-Aspartic acid is easily accessible industrially, eg. by reaction of ammonia with maleic acid or fumaric acid. L-Aspartic acid is obtainable, for example, by asymmetric L-aspartase-catalyzed addition of ammonia to fumaric acid. Preferably, L- and DL-aspartic acid or mixtures of these isomers are used for preparing the polycocondensates.
Suitable components (b) are polymers containing carboxyl groups, which contain at least 10 mol % of a monoethylenically unsaturated carboxylic acid in copolymerized form and have a molecular weight of at least 300. These polymers can be homopolymers of monoethylenically unsaturated carboxylic acids or copolymers of these carboxylic acids with other monoethylenically unsaturated monomers copolymerizable therewith or copolymers of at least 2 monoethylenically unsaturated carboxylic acids or anhydrides. Suitable monoethylenically un

REFERENCES:
patent: 3634543 (1972-01-01), Sherman
patent: 5134188 (1992-07-01), Blum et al.
Database WPI Derwent Publications Ltd., London, GB; AN 7648999 & JP,A, 51 054 694 (Agency Of Ind Sci Tech) 14. Mai 1976.

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