Process for preparing a modified polymer
US6627667B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2001 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Jul 3, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/047
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention is directed to a process for modifying a water soluble polymer, said process comprisingmodifying a polymer containing amine groups, by reacting at least one of said amine groups with activated ester, said ester being the reaction product of a carboxyl activator and the carboxyl group of a molecule R—COOH, said R-group being a functional group, to produce a reaction mixture containing a polymer, said polymer containing at least one amide group;subjecting said reaction mixture to at least ion exchange chromatography to purify said reaction mixture, said purification comprising at least partly removing the said reaction product, and/or carboxyl activator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.