Method for end-capping polycarbonate resins and composition for use in same
US6706846B2 · kind B2 · utility
36Cited by
17References
47Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 10, 2001 |
| Grant date | Mar 16, 2004 |
| 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 an optionally-substituted phenol, 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.