Patent · US Expired

Process for the production of polysuccinimide or maleic amide acid

US5530091A · kind A · utility

4Cited by

3References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Paul Wagner · Mülheim an der Ruhr, DE
Dietrich Gehrmann · Leverkusen, DE
Thomas Bamberger · Duisburg, DE
Manfred Giltjes · Neunburg vorm Wald, DE
Winfried Joentgen · Neunburg vorm Wald, DE
Torsten Groth · Reinbek, DE

Key dates

Filing date	Feb 21, 1995
Grant date	Jun 25, 1996
Priority date	—
Expiry date	Feb 21, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G73/1092
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Molten maleic anhydride is introduced in the form of fine droplets at 53.degree. C. to 250.degree. C. and preferably at 60.degree. C. to 120.degree. C. into a gas atmosphere which consists either of pure gaseous ammonia or of a gas mixture of ammonia and at least one other gas and of which the temperature is between 20.degree. C. and 500.degree. C. The process is carried out at a temperature of 120.degree. C. to 180.degree. C. for the production of polysuccinimide and at a temperature of 10.degree. C. to 120.degree. C. for the production of maleic amide acid.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.