Stable silicone coated fabric without adhesion promoter
AssigneeHighland Industries, Inc.
InventorJoseph J. Chiou
Life of this patent
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Abstract
A silicone rubber composition that is capable of adhering to the surface of various kinds of substrates, in particular woven fabrics or the like in the absence of an adhesion promoter or coupling agent. The composition of the present invention includes a dual catalyst system which enhances the cure rate of the silicone compound. Strong adhesion of the silicone rubber coating composition to the substrate is achieved at high coating speeds using a mixture of an organopolysiloxane, an organohydrogenpolysiloxane resin, a platinum catalyst, and a peroxide curing agent. The silicone rubber composition is particularly suitable as a coating for airbag fabrics.
Claims18
A silicone coated fabric, comprising:
- a) a fabric substrate;
- and
- b) a layer of a silicone rubber cured and adhering to at least one surface of the fabric substrate, the rubber being a cured self-adhesive silicone rubber composition without organofunctional silane adhesion promoters, said composition comprising:
- i) 100 parts by weight of an organopolysiloxane represented by the general formula
- R.sub.n SiO.sub.(4-n)/2
- wherein R is an unsubstituted or substituted monovalent hydrocarbon group and n is a positive number in the range from about 1.98 to 2.01, and having a viscosity of at least 300 centistokes at 25.degree. C.;
- ii) about 0.1 to about 20 parts by weight of an organohydrogenpolysiloxane resin having the general formula
- M'Q
- wherein M' is R.sub.2 SiHO.sub.0.5, R is a monovalent hydrocarbon radical selected from the group consisting of lower alkyl and aryl radicals, and the group denoted by Q is SiO.sub.2, a tetrafunctional unit;
- iii) a platinum curing agent;
- and
- iv) an organic peroxide curing agent.
A silicone rubber coated airbag, comprising:
- a) airbag fabric;
- and
- b) a layer of a silicone rubber cured and adhered to at least one surface of the airbag fabric, the rubber being a cured self-adhesive silicone rubber composition without organofunctional silane adhesion promoters, said composition comprising:
- i) 100 parts by weight of an organopolysiloxane represented by the general formula
- R.sub.n SiO.sub.(4-n)/2
- wherein R is an unsubstituted or substituted monovalent hydrocarbon group and n is a positive number in the range from about 1.98 to 2.01, and having a viscosity of at least 300 centistokes at 25.degree. C.;
- ii) about 0.1 to about 20 parts by weight of an organohydrogenpolysiloxane resin having the general formula
- M'Q
- wherein M' is R.sub.2 SiHO.sub.0.5, R is a monovalent hydrocarbon radical selected from the group consisting of lower alkyl and aryl radicals, and the group denoted by Q is SiO.sub.2, a tetrafunctional unit;
- iii) a platinum curing agent;
- and
- iv) an organic peroxide curing agent.
A method of preparing airbag fabric coated with a silicone rubber, comprising the step of coating at least one surface of the airbag fabric with a composition lacking organofunctional silane adhesion promoters, said composition comprising:
- a) 100 parts by weight of an organopolysiloxane represented by the general formula
- R.sub.n SiO.sub.(4-n)/2
- wherein R is an unsubstituted or substituted monovalent hydrocarbon group and n is a positive number in the range from about 1.98 to 2.01, and having a viscosity of at least 300 centistokes at 25.degree. C.;
- b) about 0.1 to about 20 parts by weight of an organohydrogenpolysiloxane resin having the general formula
- M'Q
- wherein M' is R.sub.2 SiHO.sub.0.5, R is a monovalent hydrocarbon radical selected from the group consisting of lower alkyl and aryl radicals, and the group denoted by Q is SiO.sub.2, a tetrafunctional unit;
- c) a platinum curing agent;
- and
- d) an organic peroxide curing agent.
Dependencies are inferred from the claim text.