US 4,988,758 AGranted

Fluorosilicone rubber composition

AssigneeShin-Etsu Chemical Co., Ltd.

InventorsTakeshi Fukuda, Motoo Fukushima, Kunio Itoh, Hironao Fujiki

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Abstract

The fluorine-substituted organopolysiloxane as the principal ingredient of the inventive silicone rubber composition has vinyl groups to serve as the cross-linking points at the molecular chain terminals while at least the penultimate siloxane unit or the silicon atom adjacent to the terminal silicon atom has no fluorine-substituted hydrocarbon group bonded to the silicon atom. Being freed from the steric hindrance due to the bulky fluorine-substituted hydrocarbon group bonded to the adjacent silicon atom, the vinyl group bonded to the terminal silicon atom can pertain to the cross-linking reaction much easier than otherwise so that the silicone rubber composition of the invention containing an organic peroxide or a combination of an organohydrogenpolysiloxane and a platinum catalyst as a curing agent can be rapidly cured to give a cured silicone rubber article having excellent resistance against oils and organic solvents as well as mechanical properties.

Claims8

Dependent claims

A curable fluorine-substituted organopolysiloxane composition which comprises, in mixture

(A) a polyorganosiloxane having a viscosity of at least 400 centipoise at 25.degree. C. and a molecular structure represented by the general formula
.sup.1 --O--(--SiR.sub.2 --O--).sub.n --(--SiRR.sub.f --O--).sub.m --X.sup.2,
or
[X.sup.1 --O--(--SiR.sub.2 i--O--).sub.n --(--SiRR.sub.f --O--).sub.m --].sub.p SiR.sub.4-p,
in which R is a monovalent hydrocarbon group selected from the class consisting of methyl, vinyl and phenyl groups, R.sub.f is a fluorinated alkyl group having 3 to 10 carbon atoms, n is zero or a positive integer, m is a positive integer with the proviso that n:(m+n) is in the range from 0.005 to 1, p is 2, 3 or 4, X.sup.1 is a vinyl dimethyl siloxy-substituted silyl group represented by the general formula
Vi-SiMe.sub.2 --(--O--SiMe.sub.2 --).sub.r --,
in which Vi is a vinyl group, Me is a methyl group and r is a positive integer in the range from 1 to 30, and X.sup.2 is a hydrogen atom or X.sup.1 ;
and
(B) an organic peroxide curing agent in an amount sufficient to cure the component (A).

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/222,212Filed 21 Jul 1988 · continuation in part
Priority: JP 61-965220 Jan 1986
Granted: 29 Jan 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08K 5/14
Oxygen-containing compounds: peroxides
C08G 77/24
Containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen: halogen-containing groups
C08L 83/08
Polysiloxanes: containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
C08K
Use of inorganic or non-macromolecular organic substances as compounding ingredients