Method for end-capping polycarbonate resins and composition for use in same
US6500914B1 · kind B1 · utility
30Cited by
13References
46Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2001 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Oct 10, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for end-capping polycarbonate resins, comprising the step of processing a mixture comprising a polycarbonate having free hydroxyl-end groups and an end-capping reagent in a melt transesterification reaction to produce a polycarbonate resin, wherein the end-capping reagent comprises a mixture of:(a) at least one species of a symmetrical activated aromatic carbonate, and (b) at least one species of a symmetrical non-activated aromatic carbonate, whereby said end-capping reagent reacts with at least some of the free hydroxyl end-groups of the polycarbonate to produce an end-capped polycarbonate resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.