C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 5/54 (2006.01) C08L 83/08 (2006.01) C09D 183/04 (2006.01) C09D 183/08 (2006.01)
Patent
CA 2280519
The present invention relates to a one-part room temperature vulcanizable organopolysiloxane rubber composition which crosslinks in the presence of moisture to form a coating for the corrosion protection of metals. The one-part organopolysiloxane rubber composition comprises the product which is obtained by mixing the following: a) from about 20 to about 50 weight percent of one or more polydiorganosiloxane fluids of the formula R"[(R)2SiO]n R' in which R is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical, R' is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms or a phenyl radical, R" is OH or 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 1 to about 100,000 centipoise at 25°C, wherein at least one of the polyorganosiloxane fluid has R" equal to OH and n has an average value such that the viscosity is in the range from 1,000 to 100,000 centipoise at 25°C, preferably from 3,000 to 40,000 centipoise at 25°C; b) from 0 to about 40 weight percent of a cycloorganosiloxane of the formula [(R)2SiO]n in which R is a monovalent alkyl or alkylene radical 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 and n has an average value of 3 to 10 -27- c) from 0 to about 40 weight percent of an inorganic extending or non-reinforcing filler d) from about 0.5 to about 10 weight percent of an amorphous SiO2 reinforcing filler having a surface area of between about 100 to 250 m2/g and a particle sine range between about 0.01 and 0.03 microns; e) from about 1 to about 7 weight percent of an oximosilane cross-linking agent of the formula; RSi(ONR'2) in which R and R' 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; f) from about 0.2 to about 3 weight percent of an adhesion promoter of the formula R3b (R2O)3-b SiR1 in which R2 and R3 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 alkyd. radical having 1 to 8 carbon atoms, b is an integer between, 0 and 3, and R1 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. -28-
Ahmed Farooq
Barr John
Huda Faisal
Huda Seraj Ul
Csl Silicones Inc.
Dennison Associates
LandOfFree
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