Air bag-containing cover
First Claim
1. An air-bag-containing cover comprising:
- a soft surface skin layer made of a thermoplastic blended polymeric material containing the following ingredients A, B, C and D;
ingredient A;
a hydrogenated derivative of a block copolymer comprising styrene and conjugated diene,ingredient B;
an olefinic resin,ingredient C;
a polyisobutylene with a viscosity average molecular weight of not greater than 70,000, andingredient D;
a hydrocarbon series rubber softening agent with a kinetic viscosity at 40°
C. of not greater than 500 cSt and/or polybutene with a number average molecular weight of not greater than 2500, in which blending ratio is;
ingredient A=40 to 80% by weight,ingredient B=5 to 30% by weight,ingredient C=2 to 30% by weightingredient D=0 to 20% by weight, and having a JIS-A hardness according to JIS-K6301 of from 20 to 90, anda rigid core layer made of an olefinic resin having a modulus in flexure according to JIS-K7203 of from 1000 to 7000 kg/cm2, in whichsaid core layer has a hardness greater than that of said surface skin layer, and said core layer has a portion for easily bursting the cover upon initiation of the air bag operation.
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Accused Products
Abstract
An air bag-containing cover comprising:
a soft surface skin layer made of a thermoplastic polymer containing the following ingredients A, B, C and D:
ingredient A: a hydrogenated derivative of a block copolymer comprising styrene an conjugated diene,
ingredient B: an olefinic resin,
ingredient C: polyisobutylene with a viscosity average molecular weight of not greater than 70,000, and
ingredient D: a hydrocarbon series rubber softening agent with a kinetic viscosity at 40° C. of not greater than 500 cSt and/or polybutene with a number average molecular weight of not greater than 2500, in which blending ratio is:
ingredient A=40 to 80% by weight,
ingredient B=5 to 30% by weight
ingredient C=2 to 30% by weight
ingredient D=0 to 20% by weight, and having a JIS-A hardness according to JIS-K6301 of from 20 to 90, and
a rigid core layer comprising an olefinic resin having a modulus in flexure according to JIS-K7203 of from 1000 to 7000 kg/cm2, in which
the core layer has a higher hardness than that of the surface skin layer, and the core layer has a portion for easily bursting the cover upon initiation of the air bag operation.
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Citations
18 Claims
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1. An air-bag-containing cover comprising:
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a soft surface skin layer made of a thermoplastic blended polymeric material containing the following ingredients A, B, C and D; ingredient A;
a hydrogenated derivative of a block copolymer comprising styrene and conjugated diene,ingredient B;
an olefinic resin,ingredient C;
a polyisobutylene with a viscosity average molecular weight of not greater than 70,000, andingredient D;
a hydrocarbon series rubber softening agent with a kinetic viscosity at 40°
C. of not greater than 500 cSt and/or polybutene with a number average molecular weight of not greater than 2500, in which blending ratio is;ingredient A=40 to 80% by weight, ingredient B=5 to 30% by weight, ingredient C=2 to 30% by weight ingredient D=0 to 20% by weight, and having a JIS-A hardness according to JIS-K6301 of from 20 to 90, and a rigid core layer made of an olefinic resin having a modulus in flexure according to JIS-K7203 of from 1000 to 7000 kg/cm2, in which said core layer has a hardness greater than that of said surface skin layer, and said core layer has a portion for easily bursting the cover upon initiation of the air bag operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An air bag device comprising:
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a base retainer, an air bag attached to said base retainer, an inflator attached to said base retainer so as to inject a gas into the air bag to rapidly develop said air bag, and a cover for covering the air bag and secured to the base retainer, said cover comprising; a soft surface skin layer made of a thermoplastic blended polymeric material containing the following ingredients A, B, C and D; ingredient A;
a hydrogenated derivative of a block copolymer comprising styrene and conjugated diene,ingredient B;
an olefinic resin,ingredient C;
a polyisobutylene with a viscosity average molecular weight of not greater than 70,000, andingredient D;
a hydrocarbon series rubber softening agent with a kinetic viscosity at 40°
C. of not greater than 500 cSt and/or polybutene with a number average molecular weight of not greater than 2500, in which blending ratio is;ingredient A=40 to 80% by weight, ingredient B=5 to 30% by weight, ingredient C=2 to 30% by weight, ingredient D=0 to 20% by weight, and having a JIS-A hardness according to JIS-K6301 of from 20 to 90, and a rigid core layer made of an olefinic resin having a modulus in flexure according to JIS-K7203 of from 1000 to 7000 kg/cm2, in which said core layer has a hardness greater than that of said surface skin layer, and said core layer has a portion for easily bursting the cover upon initiation of the air bag operation.
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Specification