Liquid silicone rubber coating composition, curtain airbag, and its production method

1. A liquid silicone rubber coating composition comprising

(A) 100 parts by weight of an organopolysiloxane having at least 2 alkenyl groups bonded to silicon atoms per molecule;

(B) an organohydrogenpolysiloxane having at least 2 hydrogen atoms bonded to silicon atoms per molecule, at an amount such that 1 to 10 hydrogen atoms bonded to silicon atoms in the component (B) are present in relation to one alkenyl group bonded to the silicon atom in the component (A);

(C) an effective amount of an addition reaction catalyst;

(D) 0 to 50 parts by weight of a fine powder silica having a specific surface area of at least 50 m 2 /g;

(E) 0.1 to 10 parts by weight of an organic compound represented by the following general formula (1):

wherein R 1 is independently a substituted or unsubstituted monovalent hydrocarbon group and n is an integer of 2 to 10;

(F) 0.1 to 10 parts by weight of an organosilicon compound having an epoxy group and an alkoxy group bonded to a silicon atom in the molecule; and

(G) 0.1 to 5 parts by weight of at least one member selected from titanium compounds and zirconium compounds.

2. The liquid silicone rubber coating composition according to claim 1 wherein R 1 in the formula (1) of the component (E) is a straight chain, branched, or cyclic alkyl group containing 1 to 20 carbon atoms or a monovalent aromatic hydrocarbon group containing 6 to 40 carbon atoms having 1 to 4 phenyl groups or phenylene skeletons.

3. The liquid silicone rubber coating composition according to claim 1 wherein the component (G) is an organotitanium compound.

4. The liquid silicone rubber coating composition according to claim 3 wherein the organotitanium compound of the component (G) is an organotitanate, an organotitanium chelate compound, or a combination thereof.

5. The liquid silicone rubber coating composition according to claim 1 wherein the component (G) is an organozirconium compound.

6. The liquid silicone rubber coating composition according to claim 5 wherein the organozirconium compound of the component (G) is an organozirconium ester, an organozirconium chelate compound, or a combination thereof.

7. The liquid silicone rubber coating composition according to claim 1 wherein the composition is the one for producing a curtain airbag.

8. A method for producing a curtain airbag comprising the steps of coating a liquid silicone rubber coating composition comprising

(A) 100 parts by weight of an organopolysiloxane having at least 2 alkenyl groups bonded to silicon atoms per molecule;

(B) an organohydrogenpolysiloxane having at least 2 hydrogen atoms bonded to silicon atoms per molecule, at an amount such that 1 to 10 hydrogen atoms bonded to silicon atoms in the component (B) are present in relation to one alkenyl group bonded to the silicon atom in the component (A);

(C) an effective amount of an addition reaction catalyst;

(D) 0 to 50 parts by weight of a fine powder silica having a specific surface area of at least 50 m 2 /g;

(E) 0.1 to 10 parts by weight of an organic compound represented by the following general formula (1):

wherein R 1 is independently a substituted or unsubstituted monovalent hydrocarbon group and n is an integer of 2 to 10;

(F) 0.1 to 10 parts by weight of an organosilicon compound having an epoxy group and an alkoxy group bonded to a silicon atom in the molecule; and

(G) 0.1 to 5 parts by weight of at least one member selected from titanium compounds and zirconium compounds on at least one surface of a substrate comprising a fiber cloth, and

curing the coating composition to form a silicone rubber coating layer composed of the cured product of the coating composition on the at least one surface of the substrate.

9. A curtain airbag comprising a substrate comprising a fiber fabric and a silicone rubber coating layer formed by coating and curing a liquid silicone rubber coating composition comprising

(A) 100 parts by weight of an organopolysiloxane having at least 2 alkenyl groups bonded to silicon atoms per molecule;

(B) an organohydrogenpolysiloxane having at least 2 hydrogen atoms bonded to silicon atoms per molecule, at an amount such that 1 to 10 hydrogen atoms bonded to silicon atoms in the component (B) are present in relation to one alkenyl group bonded to the silicon atom in the component (A);

(C) an effective amount of an addition reaction catalyst;

(D) 0 to 50 parts by weight of a fine powder silica having a specific surface area of at least 50 m 2 /g;

(E) 0.1 to 10 parts by weight of an organic compound represented by the following general formula (1):

wherein R 1 is independently a substituted or unsubstituted monovalent hydrocarbon group and n is an integer of 2 to 10;

(F) 0.1 to 10 parts by weight of an organosilicon compound having an epoxy group and an alkoxy group bonded to a silicon atom in the molecule; and

(G) 0.1 to 5 parts by weight of at least one member selected from titanium compounds and zirconium compounds on at least one surface of the substrate.

10. The liquid silicone rubber coating composition according to claim 1 ,

wherein, in component (E), one R 1 is phenyl, the other R 1 is phenyl or methyl, and n is 3, and

wherein component (G) is titanium tetra-2-ethylhexoxide.