Curable fluorosilicone rubber composition
First Claim
1. A curable fluorosilicone rubber composition comprising:
- (A) 100 parts by weight of an organopolysiloxane represented by General Unit Formula (I);
##STR8## wherein R comprises 25 to 50 mole % of a group represented by the formula;
--CH2 CH2 Rf, where Rf represents a perfluoroalkyl group having 1 to 3 carbon atoms, and 75 to 50 mole % of a group selected from the group consisting of a methyl group, an ethyl group, a phenyl group and a vinyl group; and
a is a number of 1.98 to 2.02;
and having a viscosity of at least 1,000 cP at 25°
C.;
(B) 10 to 50 parts by weight of reinforcing silica powder having a specific surface area of at least 50 m2 /g;
(C) 0 to 100 parts by weight of semi-reinforcing silica powder having an average particle diameter of not greater than 50 μ
m;
(D) 3 to 10 parts by weight of a fluid organopolysiloxane compound represented by General Formula (II);
##STR9## wherein some R'"'"' represent methyl groups and other R'"'"' represent phenyl groups;
the ratio of the number of the methyl group to the number of the phenyl group in the molecular ranges between 70/30 and 25/75; and
n is an integer of 0 to 5; and
(E) a vulcanizing agent.
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Accused Products
Abstract
A curable fluorosilicone rubber composition comprising particular organopolysiloxane having a fluoroalkyl group and having a viscosity of 1,000 cP or more at 25° C., reinforcing silica powder having a specific surface area of 50 m2 /g or more, and a vulcanizing agent; which further comprises, as a fluid for bleed, a fluid organopolysiloxane compound represented by General Formula: ##STR1## wherein some R'"'"' represent methyl groups and other R'"'"' represent phenyl groups; the ratio of the number of the methyl group to the number of the phenyl group in the molecule ranges between 70/30 and 25/75; and n is an integer of 0 to 5.
Rubber obtained by curing of this composition has excellent oil and solvent resistance, thermal resistance and low-temperature resistance which are inherent in ordinary fluorosilicone rubber, and moreover has a good fluid-bleeding property.
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Citations
9 Claims
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1. A curable fluorosilicone rubber composition comprising:
-
(A) 100 parts by weight of an organopolysiloxane represented by General Unit Formula (I);
##STR8## wherein R comprises 25 to 50 mole % of a group represented by the formula;
--CH2 CH2 Rf, where Rf represents a perfluoroalkyl group having 1 to 3 carbon atoms, and 75 to 50 mole % of a group selected from the group consisting of a methyl group, an ethyl group, a phenyl group and a vinyl group; and
a is a number of 1.98 to 2.02;and having a viscosity of at least 1,000 cP at 25°
C.;(B) 10 to 50 parts by weight of reinforcing silica powder having a specific surface area of at least 50 m2 /g; (C) 0 to 100 parts by weight of semi-reinforcing silica powder having an average particle diameter of not greater than 50 μ
m;(D) 3 to 10 parts by weight of a fluid organopolysiloxane compound represented by General Formula (II);
##STR9## wherein some R'"'"' represent methyl groups and other R'"'"' represent phenyl groups;
the ratio of the number of the methyl group to the number of the phenyl group in the molecular ranges between 70/30 and 25/75; and
n is an integer of 0 to 5; and(E) a vulcanizing agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification