# US 8,785,586 B2 · Liquid silicone rubber coating composition, curtain airbag, and its production method

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- Number: US 8,785,586 B2
- Document ID: US8785586B2
- Status: Granted
- Kind: B2
- Application number: 13/654,794
- Filed: 2012-10-18
- Published: 2013-04-25
- Granted: 2014-07-22
- Earliest claimed: 2011-10-19
- Assignees: Shin-Etsu Chemical Co., Ltd.
- Applicants: Shin-Etsu Chemical Co., Ltd.
- Inventors: Hidenori Mizushima; Tsuneo Kimura; Shigeru Ubukata
- Web page: https://patentgrep.com/patent/US8785586B2

## CPC

- C08L 83/04: Polysiloxanes
- B60R 21/232: Curtain-type airbags deploying mainly in a vertical direction from their top edge
- C08G 77/12: containing silicon bound to hydrogen
- C08G 77/20: containing silicon bound to unsaturated aliphatic groups
- C08K 3/36: Silica
- C08K 5/5399: Phosphorus bound to nitrogen
- C08K 5/0091: {Complexes with metal-heteroatom-bonds}
- C08K 5/5435: containing oxygen in a ring
- C08K 2201/006: Additives being defined by their surface area
- C08L 83/00: Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A liquid silicone rubber coating composition is provided. The composition comprises (A) 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; (C) an addition reaction catalyst; (D) a fine powder silica; (E) an organic compound represented by the following general formula (1): wherein R1 is a monovalent hydrocarbon group and n is an integer of 2 to 10; (F) an organosilicon compound having an epoxy group and an alkoxy group bonded to a silicon atom in the molecule; and (G) either one or both of a titanium compounds and a zirconium compounds. When used for the silicone rubber coating layer on air bag base fabric, excellent low burning speed defined by FMVSS-302 is realized and the cured coating layer exhibits low surface tackiness with high anti-blocking property.

## Claims

### Claim 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 m2/g;
(E) 0.1 to 10 parts by weight of an organic compound represented by the following general formula (1):
wherein R1 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.

### Claim 2 (depends on 1)

The liquid silicone rubber coating composition according to claim 1 wherein R1 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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 3)

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.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 5)

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.

### Claim 7 (depends on 1)

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

### Claim 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 m2/g;
(E) 0.1 to 10 parts by weight of an organic compound represented by the following general formula (1):
wherein R1 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.

### Claim 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 m2/g;
(E) 0.1 to 10 parts by weight of an organic compound represented by the following general formula (1):
wherein R1 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.

### Claim 10 (depends on 1)

The liquid silicone rubber coating composition according to claim 1,
wherein, in component (E), one R1 is phenyl, the other R1 is phenyl or methyl, and n is 3, and
wherein component (G) is titanium tetra-2-ethylhexoxide.