Stereoregular poly(methyl(3,3,3-trifluoropropyl)-siloxane) polymers and methods for making
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United States of America Patent
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Mar 28, 1995
Grant Date -
N/A
app pub date -
Feb 3, 1994
filing date -
Feb 3, 1994
priority date (Note) -
Expired
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Abstract
The present invention is stereoregular poly{methyl(3,3,3-trifluoropropyl)siloxane} polymers and copolymers and methods for their making. The process involves reacting isomers of 1,3,5-trimethyl-1,3,5-tris(3',3',3'-trifluoropropyl)cyclotrisiloxane in the presence of an aprotic polar promoter and a lithium compound. The lithium compound initiates ring opening and polymerization of the isomers without effecting the steric arrangement of the isomers. Elastomers prepared by cross-linking polymers of the present invention can have sufficient cis 3,3,3-trifluoropropyl substitution to allow the elastomers to strain crystallize and provide reinforcement to the elastomers at typical use temperatures.
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