POLYASPARTIC ACID OR SALT THEREOF AND PROCESS FOR PRODUCING THE SAME

WIPO Patent Application WO/1996/019524

A1

Polyaspartic acid or a salt thereof, having a calcium ion chelating capacity of 4.3 (Ca++g/100g polymer) or above; a process for producing the acid or salt by hydrolyzing polysuccinimide obtained by the polycondensation of a monomer selected from the group consisting of reaction products formed between maleic acid and ammonia, aspartic acid, and maleamic acid in the presence of a solvent and an acid catalyst; a polysuccinimide as the precursor therefor; and another process for producing the acid or salt by hydrolyzing polysuccinimide obtained by the polycondensation of a monomer selected from the group consisting of reaction products formed between maleic acid and ammonia, aspartic acid, and maleamic acid in the presence of a mixture of at least two solvents including at least an aprotic polar solvent and an acid catalyst. The obtained polyaspartic acid or salt thereof is useful as a chelating agent, flocculant, scale inhibitor, detergent builder, dispersant, humectant, fertilizer additive, raw material for biodegradable polymer, and so forth.

JPH07118527	NANOMETER COMPOSITE CONTAINING POLYIMIDE AND ITS PRODUCTION
WO/2007/066948	POLYIMIDE FILM
JP7247037	Metal-clad laminate and patterned metal-clad laminate

NAKATO TAKESHI (JP)
KURAMOCHI MAYUMI (JP)
TOMIDA MASAYUKI (JP)

PCT/JP1995/002623

June 27, 1996

December 21, 1995

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MITSUBISHI CHEM CORP (JP)
NAKATO TAKESHI (JP)
KURAMOCHI MAYUMI (JP)
TOMIDA MASAYUKI (JP)

C08G73/10; (IPC1-7): C08G73/00; C08G69/00; C08G69/10; C08G73/10

JPH06298930A	1994-10-25
JPS4911990A	1974-02-01
JPH0348628A	1991-03-01
JPH06211984A	1994-08-02
JPH06248075A	1994-09-06
JPS59112260A	1984-06-28

See also references of EP 0747417A4

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