Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-10-28
1999-07-06
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528363, 528399, 525419, 525420, C08G 6910
Patent
active
059198940
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the preparation of polymers with repeating succinyl units, in particular of polyaspartic acid and polysuccinimide.
The preparation and use of polysuccinimide and polyaspartic acid (PAA) and its derivatives have been the subject of numerous publications and patents for a long time.
U.S. Pat. No. 4,839,461 (=EP-A 0 256 366) describes the preparation of polyaspartic acid from maleic anhydride, water and ammonia Maleic anhydride is reacted in an aqueous medium, with the addition of concentrated ammonia solution, and is then polymerized. During this polymerization, the mass becomes first highly viscous and then solid-porous, which requires handling which is expensive in terms of process technology.
U.S. Pat. No. 5,296,578 describes the preparation of PSI from maleic anhydride, water and ammonia. Maleic anhydride is hydrolyzed in water to give maleic acid and this is then converted into the ammonium salt with concentrated ammonia solution. The water is evaporated off from the solution in a stirred reactor and the monoammonium salt is then polymerized in bulk at temperatures above 170.degree. C. to give PSI. In this process, the mass is converted into solid PSI in the course of several hours via highly viscous phase states, and this is then hydrolyzed to give PAA.
U.S. Pat. No. 5,288,783 describes the preparation of PAA from maleic acid or fumaric acid, water and ammonia Maleic anhydride is mixed with water in a stirred tank and is converted into maleic acid, while cooling. The maleic acid monoammonium salt is prepared by addition of concentrated ammonia solution. The water contained in the mixture is then evaporated off and the dry monoammonium salt is polymerized at temperatures from 190 to 350.degree. C. An alternative proposal is to process further the monoammonium salt present in aqueous solution to PSI by extrusion at temperatures from 160 to 200.degree. C. The PSI prepared by one of the two process routes is then hydrolyzed to PAA under alkaline conditions.
EP-A 593 187 describes the preparation of PSI by thermal polymerization of maleamic acid at temperatures from 160 to 330.degree. C. over a reaction time of 2 minutes to 6 hours. Reference is also made to polycondensation in a solvent using condensation auxiliaries.
DE-A 4 023 463 (U.S. Pat. No. 5,142,062) describes a process for the preparation of polysuccinimide in the presence of phosphoric acids. DE-A 4 221 875 (=WO 94/01486) describes the preparation of so-called modified polyaspartic acids by polycondensation of aspartic acid with other compounds, if appropriate in the presence of phosphoric acids or derivatives thereof. It is known from WO 95/02007 to prepare polymers of aspartic acid by heating maleic anhydride and acid derivatives of ammonia Phosphoric acid, inter alia, is mentioned as the acid. Of the corresponding salts, however, only diammonium hydrogen phosphate and monoammonium dihydrogen phosphate are mentioned. EP-A 604 813 (DE-A 4 244 031) discloses a process for the preparation of polysuccinimide and polyaspartic acid from maleamic acid in which maleic anhydride and ammonia are reacted to give maleamic acid and-the maleamic acid is subjected to polymerization, which can be carried out in the presence of phosphoric acids and polyphosphoric salts.
The disadvantage of the known preparation processes is that they are very expensive and to a large proportion lead to products with unsatisfactory bio degradability.
The invention is based on the object of providing an improved process for the preparation of polymers with repeating succinyl units, in particular of polysuccinimide and polyaspartic acid.
The invention relates to a process for the preparation of polymers with repeating succinyl units, which comprises bringing together at least one optionally substituted 1,4-butanedicarboxylic acid, butenedicarboxylic acid or a derivative thereof with a triammonium salt of a polybasic acid and carrying out the polymerization while heating.
The invention furthermore relates to a process for the preparation of po
REFERENCES:
patent: 5296578 (1994-03-01), Koskan et al.
Bayer AG
Truong Duc
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