Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
POLYASPARTIC ACID OR SALT THEREOF AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/1996/019524
Kind Code:
A1
Abstract:
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.

Inventors:
Nakato
Takeshi, Kuramochi
Mayumi, Tomida
Masayuki
Application Number:
PCT/JP1995/002623
Publication Date:
June 27, 1996
Filing Date:
December 21, 1995
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MITSUBISHI CHEMICAL CORPORATION NAKATO
Takeshi, Kuramochi
Mayumi, Tomida
Masayuki
International Classes:
C08G73/10; (IPC1-7): C08G73/00; C08G69/00; C08G69/10; C08G73/10
Foreign References:
JPH06298930A
JPS4911990A
JPH0348628A
JPH06211984A
JPH06248075A
JPS59112260A
Other References:
See also references of EP 0747417A1
Download PDF: