C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 183/04 (2006.01) C08L 83/04 (2006.01) C08L 83/06 (2006.01) C08L 83/07 (2006.01)
Patent
CA 2435347
The present invention relates to a one-part room temperature vulcanizable organopolysiloxane rubber composition which crosslinks in the presence of moisture to form a high gloss coating with minimal shrinkage for surfaces. The one-part organopolysiloxane rubber composition consists essentially of the product which is obtained by mixing the following: a) from about 20 to about 60 weight percent of one or more polydiorganosiloxane fluids of the formula HO{(R)2SiO]n(R)2SiOH in which R is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical, and n has an average value such that the viscosity is from about 10 to about 20,000 centipoise at 25°C; b) from 0 to about 8 weight percent of a bifunctional chain extender of the general formula R 4 2-Si-X 2 where X is alkoxy or ketoximino and R 4 is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical; c) from 0 to about 50 weight percent of an inorganic extending or non-reinforcing filler; d) from about 0.5 to about 20 weight percent of an amorphous SiO2 reinforcing filler having a surface area of between about 50 to 250 m2/g 24 and a particle size range between about 0.01 and 0.03 microns; e) from about 3 to about 15 weight percent of one or more crosslinking agents of general formula (X) 4-m-S1-R'm where R' is an alkyl, alkylene or phenyl radical (preferably methyl or ethyl), X is an alkyl radical with a functional group selected from carboxyl, ketoximino, alkoxy, carbonyl or amine linked directly to the silicone atom, and m is an integer of from 0 to 2; f) from about 0.2 to about 3 weight percent of an adhesion promoter of the formula R 3 b (R 2 O) 3-b SiR 1 in which R 2 and R 3 are independently selected from monovalent alkyl or alkylene radicals having 1 to 8 carbon atoms or a phenyl radical which may optionally be substituted with an alkyl radical having 1 to 8 carbon atoms, b is an integer between 0 and 3, and R 1 is a saturated, unsaturated or aromatic hydrocarbon radical having 1 to 10 carbon atoms which may optionally contain a functional group; and g) from about 0.02 to about 3 weight percent of an organotin salt as a condensation catalyst. 25
Ahmed Farooq
Barr John
Huda Faisal
Huda Seraj Ul
Csl Silicones Inc.
Dennison Associates
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