Stereoregular poly(methyl(3,3,3-trifluoropropyl)-siloxane)...

Details Stereoregular poly(methyl(3,3,3-trifluoropropyl)-siloxane)... Stereoregular poly(methyl(3,3,3-trifluoropropyl)-siloxane)...

C - Chemistry, Metallurgy

08

G

C08G 77/22 (2006.01) C08G 77/24 (2006.01) C08K 5/00 (2006.01) C08L 83/08 (2006.01)

Patent

CA 2141518

The present invention provides stereoregular poly{methyl(3,3,3-trifluoropropyl)siloxane} polymers and copolymers with 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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