Method of making graft, block-graft and star-shaped copolymers by in-situ coupling reaction
US6639013B1 · kind B1 · utility
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Key dates
| Filing date | Jul 3, 2000 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Jul 3, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G81/021
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a method for the preparation of graft, block, and star-shaped copolymers. The method involves in situ coupling reaction between a living anionic backbone polymer possessing epoxy side chains and other living anionic polymers. The present method is simple, the coupling reaction is fast, pure copolymers are produced and the molecular weight, graft number and grafting position can be controlled to a greater extent than in existing methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.