C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5353, 18/767
C08L 27/18 (2006.01) B29C 47/00 (2006.01) C08F 259/08 (2006.01) C08K 3/26 (2006.01) C08L 83/00 (2006.01) C08L 83/04 (2006.01) D01D 5/16 (2006.01)
Patent
CA 1326099
ABSTRACT A process for producing a semi-interpenetrating polymer network of polytetrafluoroethylene and silicone elastomers is described which comprises the steps of (1) intimately blending a mixture of a major amount of unsintered and unfibrillated parti- culate polytetrafluoroethylene dispersion resin and minor amounts of (A) a hydrocarbon liquid and (B) an addition curable silicone composition consisting essentially of a polydiorganosiloxane having alkenyl unsaturation, an organohydrogenpolysiloxane cross- linking agent a catalyst for promoting crosslinking of said polysiloxane, and an inhibitor for the catalytic reaction; (2) forming said blend into an extrudable shape; (3) biaxially extru- ding said blend through a die into a shaped extrudate product having a randomly fibrillated structure; (4) evaporating said hydrocarbon liquid, and activating said catalyst so as to generate a cured silicone elastomer and polytetrafluoroethylene semi-inter- penetrating polymer network comprising said fibrillated extrudate structure. Products produced by this process have improved physi- cal properties as compared to extruded fibrillated polytetra- fluoroethylene dispersion resin alone.
555735
Dillon Joseph A.
Dillon Mark E.
Donaldson Company Inc.
Smart & Biggar
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