Preparation of products of the reaction of polyaspartimide and a

Details Preparation of products of the reaction of polyaspartimide and a Preparation of products of the reaction of polyaspartimide and a

1995-09-06

1997-06-17

Seidleck, James J.

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

Synthetic resins

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

525418, 525425, 525432, 252180, 252175, 510501, C08F28300, C08G 6391

Patent

active

056398328

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/EP94/00511 filed Feb. 23, 1994.


BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a process for preparing products of the reaction of polyaspartimide and amino acids and to the use of the reaction products as additive-to-detergents and cleaners, as scale inhibitor and as dispersant.
2. Description of the Related Art
The preparation of polyaspartimides by thermal polymerization of aspartic acid in the presence or absence of other amino acids is disclosed, for example, in U.S. Pat. No. 3,052 655, DE-A-4 023 463 and U.S. Pat. No. 5,057,597.
DE-A-2 032 470 discloses a process for preparing polyaspartic acid hydroxylamides by reacting polyaspartimides with alkanolamines in a solution of dimethylformamide or dimethyl sulfoxide. The reaction products are used as plasma expenders.
DE-A-2 253 190 discloses the use of polyaspartimides reacted with long-chain alkylamines as surfactants in detergents. The reaction is carried out in dimethylformamide as solvent.
J. Med. Chem. 16. (1973) 893 describes the preparation of products of the reaction of polyaspartimides and ethanolamine and the use of the reaction products as plasma expanders.
EP-A-0 406 623 discloses the use of the products of the reaction of polyaspartimides with amino compounds as coating agents and/or release-slowing agents for pharmaceutical forms of therapeutic agents and for foodstuffs and other consumables. The reactions are carried out in dimethylformamide as solvent.
As is evident from the abovementioned prior art, the reaction of polyaspartimide is carried out in solvents such as dimethylformamide or dimethyl sulfoxide. The removal of these solvents from the reaction products is industrially elaborate. In addition, dimethylformamide is toxic, not least embryotoxic.


OBJECTS OF THE INVENTION

It is an object of the present invention to provide an improved process for preparing products of the reaction of polyaspartimide and compounds containing NH groups. It is another object of the present invention to indicate novel applications of products of the reaction of polyaspartimides and compounds containing NH groups.
The first object mentioned is achieved by a process for preparing products of the reaction of polyaspartimides and amino acids where amino acids are reacted with polyaspartimides in aqueous medium at pH values at which at least 5% of the amino groups in the amino acids are in non-protonated form in equilibrium with the protonated form.
The second object is achieved by using products of the reaction of polyaspartimides with amino acids, alkanolamines or aminated C.sub.1 -C.sub.30 -fatty alcohol alkoxylates which contain as copolymerized units up to 50 mol % of ethylene oxide and/or propylene oxide per mole of fatty alcohol as additive to detergents and cleaners, as scale inhibitor or as dispersant.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

The polyaspartimides suitable as starting material can be prepared by all the known processes, eg. by polycondensation of L- or DL-aspartic acid at from 190.degree. to 270.degree. C., by polycondensation of L- or DL-aspartic acid in the presence of 0.1-10 mol of phosphoric acid, polyphosphoric acid, phosphorous acid, hypophosphorous acid or hydrochloric acid per mole of aspartic acid. With amounts of at least 2 mol of phosphoric acid per mole of aspartic acid, the polycondensation of the aspartic acid is carried out as a solution polycondensation, whereas in the presence of smaller amounts of phosphoric acid the polycondensation takes place in a continuous solid or highly viscous phase. Polyaspartimide can also be prepared from the ammonium salts or amides of fumaric acid, maleic acid or malic acid by heating at up to 250.degree. C. Maleamic acid and the ammonium salt of maleamic acid are particularly preferably obtained by reacting solid or molten maleic anhydride with gaseous ammonia in the form of a solid/gas phase reaction. The polyaspartimide obtained by polycondensation of acetylaspartic acid can also be used as starting material. Th

REFERENCES:
patent: 3846380 (1974-11-01), Fujimoto et al.
J. Med. Chem 16 (1973) 893.

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