Title:
METHOD OF POLYCARBONATE PREPARATION
Document Type and Number:
WIPO Patent Application WO2001085825
Kind Code:
A3
Abstract:
High molecular weight polycarbonates are prepared from hindered bisphenols in a reaction sequence involving conversion of the hindered bisphenol to the corresponding bischloroformate and subsequent treatment with an amine catalyst and aqueous base to effect polymerization by hydrolysis and condensation of the bischloroformate groups. Tertiary aliphatic and cycloaliphatic amine catalysts bearing at least one methyl group are found to be especially effective in promoting this polymerization reaction. Reaction rates and selectivities are shown to be superior to known methods employing tertiary amines lacking methyl groups attached to nitrogen, such as triethylamine. The inclusion of chain stoppers allows the preparation of well defined mixtures of polycarbonate oligomers from hindered bisphenols. Additionally, the methodology may be used to prepare symmetrical diaryl carbonates from hindered phenols.
Inventors:
PHELPS PETER DAVID
SHANKLIN ELLIOTT WEST
BRUNELLE DANIEL JOSEPH
SHANKLIN ELLIOTT WEST
BRUNELLE DANIEL JOSEPH
Application Number:
PCT/US2001/010619
Publication Date:
July 25, 2002
Filing Date:
April 03, 2001
Export Citation:
Assignee:
GEN ELECTRIC (US)
International Classes:
C07C68/02; C08G64/24; (IPC1-7): C08G64/24; C07C68/02; C07C69/96
Foreign References:
| US4471105A | 1984-09-11 | |||
| US4316980A | 1982-02-23 | |||
| US5288837A | 1994-02-22 | |||
| US4368315A | 1983-01-11 | |||
| DE2315888A1 | 1974-10-17 | |||
| US3193529A | 1965-07-06 | |||
| EP0004021A1 | 1979-09-19 | |||
| GB808490A | 1959-02-04 | |||
| GB841654A | 1960-07-20 |
Other References:
"THE INTERFACIAL POLYCONDENSATION OF TETRABROMOBISPHENOL-A POLYCARBONATE. ÖI. MODEL REACTION AND MECHANISM STUDIES", ANGEWANDTE MAKROMOLEKULARE CHEMIE. APPLIED MACROMOLECULAR CHEMISTRY AND PHYSICS, WILEY VCH,WEINHEIM, DE, vol. 208, 1 May 1993 (1993-05-01), pages 65 - 77, XP000372853, ISSN: 0003-3146
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