Resin composition, gasket material and gasket integrated with metal
First Claim
1. A resin composition which comprises a thermoplastic elastomer composition comprising 100 parts by weight of a (a1) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 300,000, in which the at least one polymer block composed principally of a vinyl aromatic compound is polystyrene, and in which the content by weight of the polystyrene moiety that is contained in the hydrogenated block copolymer is in the range of 20 to 40%;
- 100 to 200 parts by weight of a (b1) non-aromatic rubber softening agent having a kinematic viscosity at 40°
C. of at least 300 mm2s−
1 and 10 to 50 parts by weight of a (c1) modified polyolefinic resin, said resin composition having a hardness as measured in accordance with JIS K6253 with durometer of type A being at most 50 degrees and a compression set as measured in accordance with JIS K6262 after being allowed to stand at 70°
C. under a compression ratio of 25% for 22 hours being at most 50%, wherein the (c1) modified polyolefinic resin is that which has a functional group having an absorption band at a wave number in the range of 1500 to 2000 cm−
1 in the infrared absorption spectrum thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
There are disclosed a resin composition which is excellent in rubber elasticity, oil maintainability and adhesivity to a metal, and comprises a thermoplastic elastomer composition comprising a (a1) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of a polymer block composed principally of a vinyl aromatic compound and a polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 200,000, in which the polymer block composed principally of a vinyl aromatic compound is polystyrene, and in which the content by weight of the polystyrene moiety contained in the hydrogenated block copolymer is 20 to 40%; a (b1) non-aromatic rubber-softening agent having a kinematic viscosity at 40° C. of at least 300 mm2s−1; and a (c1) modified polyolefinic resin, the resin composition having a hardness according to JIS K6253 of at most 50 degrees and a compression set according to JIS K6262 of at most 50%; a composite molded body of a metal and the thermo-plastic elastomer composition such as a gasket integrated with a metallic sheet; and processes for producing the above products.
20 Citations
37 Claims
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1. A resin composition which comprises a thermoplastic elastomer composition comprising 100 parts by weight of a (a1) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 300,000, in which the at least one polymer block composed principally of a vinyl aromatic compound is polystyrene, and in which the content by weight of the polystyrene moiety that is contained in the hydrogenated block copolymer is in the range of 20 to 40%;
- 100 to 200 parts by weight of a (b1) non-aromatic rubber softening agent having a kinematic viscosity at 40°
C. of at least 300 mm2s−
1 and 10 to 50 parts by weight of a (c1) modified polyolefinic resin, said resin composition having a hardness as measured in accordance with JIS K6253 with durometer of type A being at most 50 degrees and a compression set as measured in accordance with JIS K6262 after being allowed to stand at 70°
C. under a compression ratio of 25% for 22 hours being at most 50%, wherein the (c1) modified polyolefinic resin is that which has a functional group having an absorption band at a wave number in the range of 1500 to 2000 cm−
1 in the infrared absorption spectrum thereof. - View Dependent Claims (2, 3, 4, 5, 6, 22)
- 100 to 200 parts by weight of a (b1) non-aromatic rubber softening agent having a kinematic viscosity at 40°
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7. A thermoplastic elastomer composition comprising 100 parts by weight of a (a2) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 300,000, in which the at least one polymer block composed principally of a vinyl aromatic compound is polystyrene and in which the content by weight of the polystyrene moiety that is contained in the hydrogenated block copolymer is in the range of 20 to 40%;
- 100 to 200 parts by weight of a (b2) non-aromatic rubber softening agent having a kinematic viscosity at 40°
C. of at least 300 mm2s−
1; and
10 to 50 parts by weight of a (c2) modified hydrogenated block copolymer obtained by hydrogenating a block copolymer in which a functional group is imparted to a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound; and
0 to 20 parts by weight of a (d2) compound composed principally of a crystalline polyolefin, said thermoplastic elastomer composition having a hardness as measured in accordance with JIS K6253 with a durometer of type A being at most 50 degrees and a compression set as measured in accordance with JIS K6262 after being allowed to stand at 70°
C. under a compression ratio of 25% for 22 hours being at most 50%,wherein the (c2) modified hydrogenated block copolymer is that which has a functional group having an absorption band at a wave number in the range of 1500 to 2000 cm−
1 in the infrared absorption spectrum thereof.- View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- 100 to 200 parts by weight of a (b2) non-aromatic rubber softening agent having a kinematic viscosity at 40°
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21. A gasket, comprising a gasket material integrated with a metal, which is formed by molding said gasket material,
wherein said gasket material comprises a resin composition, and wherein said resin composition comprises a thermoplastic elastomer composition comprising 100 parts by weight of a (a1) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 200,000, in which the at least one polymer block composed principally of a vinyl aromatic compound is polystyrene, and in which the content by weight of the polystyrene moiety that is contained in the hydrogenated block copolymer is in the range of 20 to 40%; - 100 to 200 parts by weight of a (bi) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
C. of at least 300 mm2s−
1; and
10 to 50 parts by weight of a (c1) modified polyolefinic resin, said resin composition having a hardness as measured in accordance with JIS K6253 with a durometer of type A being at most 50 degrees and a compression set as measured in accordance with JIS K6262 after being allowed to stand at 70°
C. under a compression ratio of 25% for 22 hours being at most 50%.
- 100 to 200 parts by weight of a (bi) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
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23. A gasket, comprising a gasket material integrated with a metal, which is formed by molding said gasket material into a gasket integrated with a metallic cover or a metallic frame,
wherein said gasket material comprises a thermoplastic elastomer composition, and wherein said thermoplastic elastomer composition comprises 100 parts by weight of a (a2) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 200,000, in which the at least one polymer block composed principally of a vinyl aromatic compound is polystyrene and in which the content by weight of the polystyrene moiety that is contained in the hydrogenated block copolymer is in the range of 20 to 40%; - 100 to 200 parts by weight of a (b2) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
C. of at least 300 mm2s−
1;
10 to 50 parts by weight of a (c2) modified hydrogenated block copolymer obtained by hydrogenating a block copolymer in which a functional group is imparted to a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound; and
0 to 20 parts by weight of a (d2) compound composed principally of a crystalline polyolefin, said thermoplastic elastomer composition having a hardness as measured in accordance with JIS K6253 with a durometer of type A being at most 50 degrees and a compression set as measured in accordance with JIS K6262 after being allowed to stand at 70°
C. under a compression ratio of 25% for 22 hours being at most 50%. - View Dependent Claims (24)
- 100 to 200 parts by weight of a (b2) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
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25. A process for producing a gasket integrated with a cover, comprising placing a metallic cover in a mold, and injecting a gasket material composed of a thermoplastic elastomer composition onto the surface of said cover so as to form a gasket portion, wherein the thermoplastic elastomer composition is injection cast from a direction different from the direction towards a butt contact surface on the gasket portion upon the use thereof, and wherein the thermoplastic elastomer composition comprises 100 parts by weight of a (a6) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 150,000, in which the at least one polymer block composed principally of a vinyl aromatic compound is polystyrene, and in which the content by weight of the polystyrene moiety that is contained in the hydrogenated block copolymer is in the range of 20 to 40%;
- 50 to 200 parts by weight of a (b6) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
C. of at least 300 mm2s−
1; and
5 to 50 parts by weight of a (c6) polyolefinic resin composed principally of polypropylene, said thermoplastic elastomer composition having a hardness as measured in accordance with JIS K6253 with durometer of type A being at most 50 degrees and a compression set measured in accordance with JIS K6262 after being allowed to stand at 70°
C. under a compression ratio of 25% for 22 hours being at most 50%.
- 50 to 200 parts by weight of a (b6) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
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26. A process for producing a gasket integrated with a cover, comprising placing a metallic cover in a mold, and injecting a gasket material composed of a thermoplastic elastomer composition onto the surface of said cover so as to form a gasket portion, wherein the thermoplastic elastomer composition is injection cast from a direction different from the direction towards a butt contact surface on the gasket portion upon the use thereof, and wherein the thermoplastic elastomer composition comprises 100 parts by weight of a (a7) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of at least one polymer block composed principally of a vinyl aromatic compound and at least one polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 200,000, in which the at least one polymer block composed principally of a vinyl aromatic compound is polystyrene, and in which the content by weight of the polystyrene moiety that is contained in the hydrogenated block copolymer is in the range of 20 to 40%;
- 100 to 200 parts by weight of a (b7) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
C. of at least 300 mm2s−
1; and
10 to 50 parts by weight of a (c7) modified polyolefinic resin, said thermoplastic elastomer composition having a hardness as measured in accordance with JIS K6253 with durometer of type A being at most 50 degrees and a compression set as measured in accordance with JIS K6262 after being allowed to stand at 70 °
C. under a compression ratio of 25% for 22 hours being at most 50%. - View Dependent Claims (27, 28)
- 100 to 200 parts by weight of a (b7) non-aromatic rubber-softening agent having a kinematic viscosity at 40°
- 29. A process for producing a composite molded body of a resin and metal which comprises subjecting part or all of the surface of a metallic part that comes into contact with a resin portion to a corona treatment or a plasma treatment, thereafter placing the metallic part thus treated in a mold, and then injecting a thermoplastic elastomer composition onto the surfaces of the metallic part placed in the mold to form the resin portion.
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36. A process for producing a gasket integrated with a cover, comprising placing a metallic cover in a mold, and injecting a gasket material composed of a thermoplastic elastomer composition onto the surface of said cover so as to form a gasket portion, wherein the thermoplastic elastomer composition is injection cast from a direction different from the direction towards a butt contact surface on the gasket portion upon the use thereof, and wherein the thermoplastic elastomer composition is injection cast onto the surface of the cover from the direction towards the rear face of the gasket portion through at least one hole bored in advance in the metallic cover.
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37. A process for producing a gasket integrated with a cover, comprising placing a metallic cover in a mold, and injecting a gasket material composed of a thermoplastic elastomer composition onto the surface of said cover so as to form a gasket portion, wherein the thermoplastic elastomer composition is injection cast from a direction different from the direction towards a butt contact surface on the gasket portion upon the use thereof, and wherein the thermoplastic elastomer composition is injection cast onto the surface of the cover from the direction towards a side face of the gasket portion.
Specification