Production of a polysuccinimide and derivatives thereof in the presence of a sulfur-containing dehydrating agent
US5508434A · kind A · utility
18Cited by
4References
41Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 28, 1994 |
| Grant date | Apr 16, 1996 |
| Priority date | — |
| Expiry date | Sep 28, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polysuccinimide of varying molecular weight has been prepared by heat polymerization of aspartic acid in the presence of a sulfur-containing dehydrating agent employing a variety of reaction mixtures and reaction conditions. Sulfur trioxide and heat decomposable sulfur trioxide precursor dehydrating agents are preferred for this purpose. The presence of an acid scavenger within the reaction mixture is desirable and leads to a relatively higher molecular weight polysuccinimide, while the absence of an acid scavenger results in a relatively lower molecular weight polysuccinimide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.