Title:
PROCESS FOR THE PREPARATION OF POLYDIMETHYLSILOXANE BLOCK COPOLYMERS
Document Type and Number:
WIPO Patent Application WO1994013729
Kind Code:
A3
Abstract:
The present invention is an improvement upon the process for making block copolymers of vinyl aromatic hydrocarbons and/or conjugated dienes, and polydimethylsiloxane by first anionically polymerizing the vinyl aromatic hydrocarbon to make a living polymer block and then adding hexamethylcyclotrisiloxane and a polar promoter to polymerize a polydimethylsiloxane block at the end of the living polymer block. The improvement comprises reacting the living polymer blocks with a crossover reagent to decrease the crossover time from the living polymer block polymerization to the polydimethylsiloxane polymerization.
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Inventors:
HOXMEIER RONALD JAMES
Application Number:
PCT/EP1993/003559
Publication Date:
August 04, 1994
Filing Date:
December 13, 1993
Export Citation:
Assignee:
SHELL INT RESEARCH (NL)
International Classes:
C08G77/442; (IPC1-7): C08G77/442; C08F297/00
Foreign References:
| GB1308459A | 1973-02-21 | |||
| US4148838A | 1979-04-10 | |||
| GB1267644A | 1972-03-22 | |||
| GB1375871A | 1974-11-27 |
Other References:
THOMAS RHEIN: "BLOCKCOPOLYMERE AUS 2-ISOPROPENYLNAPHTHALIN UND HEXAMETHYLCYCLOTRISILOXAN", MAKROMOLEKULARE CHEMIE .MACROMOLECULAR CHEMISTRY AND PHYSICS, vol. 186, no. 11, 1 November 1985 (1985-11-01), HEIDELBERG, pages 2301 - 2309
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