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US 10,538,623 B2Granted
Method for producing polyaspartic acid by means of a precondensate
AssigneeBASF SE
InventorsGazi Tuerkoglu, Juergen Detering, Dietrich Fehringer, Christian Benz
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Abstract
Compositions including polyaspartic acid and methods for preparing polyaspartic acid using a precondensate of aspartic acid and polyaspartimide are provided herein. Uses for such compositions are also described.
Claims17
A method for preparing polyaspartic acid, comprising the following steps:
- (a) precondensing aspartic acid at a temperature of 100 to 250° C. up to a degree of conversion of at least 2% to obtain a precondensate;
- (b) adding 1 to 25 mol % of an acidic catalyst to the precondensate to form a reaction mixture;
- (c) polycondensing the reaction mixture at 170 to 250° C. to obtain polycondensates;
- and
- (d) hydrolyzing the polycondensates with addition of a base.
2 more elements
A method for preparing polyaspartic acid, comprising the following steps:
- (i) contacting a mixture of:
- aspartic acid and 3 to 35 wt % polyaspartimide
- with
- water and 1 to 25 mol % of methanesulfonic acid in a reactor;
- (ii) polycondensing the mixture at a temperature of 170 to 250° C. to obtain polycondensates;
- and
- (iii) hydrolyzing the polycondensates with addition of a base to obtain polyaspartic acid.
4 more elements
Dependencies are inferred from the claim text.