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US 2012/0259057 A1Published application
Air bag cover and thermoplastic elastomer composition therefor
AssigneeSumitomo Chemical Company, Limited
InventorKousuke OHTANI
Life of this patent
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Abstract
There is provided a thermoplastic elastomer composition for an air bag cover obtained by dynamically heat-treating, in the presence of a cross-linking agent, and the following components (A1), (B) and (C), wherein component (A1): a propylene-based resin, component (B): an ethylene-α-olefin-nonconjugated diene copolymer rubber, and component (C): a mineral oil-based softener, which is excellent in appearance and mechanical strength.
Claims8
A thermoplastic elastomer composition for an air bag cover obtained by dynamically heat-treating, in the presence of a cross-linking agent, the following components (A1), (B) and (C):
- the component (A1):
- a propylene-based resin containing the following components (a) and (b):
- the component (a):
- a propylene-based polymer component in which the content of a monomer unit derived from propylene is 90 to 100 wt % of the component (a);
- and
- the component (b):
- an ethylene-α-olefin copolymer component in which the content of a monomer unit derived from ethylene is 20 to 80 wt % and the content of a monomer unit derived from α-olefin is 80 to 20 wt % of the component (b),
- wherein the content of the component (a) is 70 to 90 wt % and the content of the component (b) is 30 to 10 wt %, and the total amount of components (a) and (b) is 100 wt % of the component (A1), and
- wherein the component (A1) has a melting temperature, measured by a differential scanning calorimeter, of 155° C. or more;
- the component (B):
- an ethylene-α-olefin-nonconjugated diene copolymer rubber in which the content of a monomer unit derived from ethylene is 35 to 75 wt % and the content of a monomer unit derived from α-olefin is 65 to 25 wt %, wherein the total amount of the monomer unit derived from ethylene and the monomer unit derived from α-olefin is 100 wt % of component (B), and wherein the ethylene-α-olefin-nonconjugated diene copolymer rubber has an iodine value of 0.1 to 7 and a Mooney viscosity (ML1+4, 125° C.) of 20 to 100;
- and
- the component (C):
- a mineral oil-based softener,
- wherein the content of the component (B) is 60 to 150 parts by weight and the content of the component (C) is 0 to 40 parts by weight per 100 parts by weight of the component (A1), and wherein an amount of a cross-linking agent is 0.01 to 0.3 part by weight per 100 parts by weight of the total amount of the components (A1), (B) and (C).
12 more elements
A thermoplastic elastomer composition for an air bag cover obtained by dynamically heat-treating, in the presence of a cross-linking agent, components (A1), (A2), (B) and (C):
- the component (A1):
- a propylene-based resin containing the following components (a) and (b):
- the component (a):
- a propylene-based polymer component in which the content of a monomer unit derived from propylene is 90 to 100 wt % of the component (a);
- and
- the component (b):
- an ethylene-α-olefin copolymer component in which the content of a monomer unit derived from ethylene is 20 to 80 wt % and the content of a monomer unit derived from α-olefin is 80 to 20 wt % of the component (b), wherein the content of the component (a) is 70 to 90 wt % and the content of the component (b) is 30 to 10 wt %, and the total amount of the components (a) and (b) is 100 wt % of the component (A1), and wherein the component (A1) has a melting temperature, measured by a differential scanning calorimeter, of 155° C. or more;
- the component (A2):
- a propylene-based resin in which the content of a monomer unit derived from propylene is 90 to 98 wt % of the component (A2);
- the component (B):
- an ethylene-α-olefin-nonconjugated diene copolymer rubber in which the content of a monomer unit derived from ethylene is 35 to 75 wt % and the content of a monomer unit derived from α-olefin is 65 to 25 wt %, wherein the total amount of the monomer unit derived from ethylene and the monomer unit derived from α-olefin is 100 wt % of the component (B), and wherein the ethylene-α-olefin-nonconjugated diene copolymer rubber has an iodine value of 0.1 to 7 and a Mooney viscosity (ML1+4, 125° C.) of 20 to 100;
- and
- the component (C):
- a mineral oil-based softener,
- wherein the content of the component (B) is 60 to 150 parts by weight and the content of the component (C) is 0 to 40 parts by weight per 100 parts by weight of the total amount of the components (A1) and (A2), and wherein an amount of a cross-linking agent is 0.01 to 0.3 part by weight per 100 parts by weight of the total amount of the components (A1), (A2), (B) and (C).
12 more elements
Dependencies are inferred from the claim text.