Elastomeric organopolysiloxanes containing...

C - Chemistry – Metallurgy – 08 – L

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400/5309

C08L 83/04 (2006.01)

Patent

CA 1141060

Bayer 3740-LH:fv ELASTOMERIC ORGANOPOLYSILOXANES CONTAINING POLYCARBODIIMIDE-POLYSILOXANE COPOLYMERS ABSTRACT A composition which is heat-curable to give an elastomer of improved resistance to hydrolytic degradation comprising a) an organopolysiloxane polymer having a viscosity of about 1,000,000 to 200,000,000 mPas at 25°C and comprising a structural unit of the formula Image wherein R is a monovalent hydrocarbon, halohydrocarbon or cyanohydrocarbon, and a is between about 1.95 and 2.01, b) a polycarbodiimide-polysiloxane copolymer, c) a curing catalyst, and d) a filler, The polycarbodiiamide-polysiloxane copolymer is responsible for improved stability and preferably the polysiloxane and poly- carbodiimide components of the copolymer are present as distinguishable phases. Le A 19 083 -US

338809

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