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AssigneeJsr Corporation
InventorsAkihiko Morikawa, Kentarou Kanae, Hideo Nakanishi, Minoru Maeda
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The present invention relates to a thermoplastic elastomer composition having a three-dimensional network structure which is not formed by a chemical crosslinking and having an excellent elasticity recovery and flexibility, a foam having a highly closed cell, an uniform cell shape, an excellent elasticity recovery, flexibility and appearance, and a process for producing the same. A thermoplastic elastomer of the invention is obtained by mixing in a predetermined ratio an EPDM (1), a crystalline polyethylenic resin (2) and a block copolymer (3) having a crystalline ethylenic polymeric block and a block which is more compatible with said EPDM than with said crystalline polyethylenic resin together with an anti-aging agent followed by kneading in a pressurized kneader. A foam of the invention is obtained by adding 1 part by mass of a wetting agent to 100 parts by mass of the thermoplastic elastomer composition described above together with a foaming agent, agitating and then performing an extrusion foaming.
A thermoplastic elastomer composition comprising an ethylene-α-olefinic copolymer (1) and a crystalline polyethylenic resin (2), wherein said crystalline polyethylenic resin (2) is in a three-dimensional network structure in a matrix comprising said ethylene-α-olefinic copolymer (1).
A thermoplastic elastomer composition comprising as main components an ethylene-α-olefinic copolymer (1), a crystalline polyethylenic resin (2) and a block copolymer (3) described below, wherein said crystalline polyethylenic resin (2) and said block copolymer (3) are in a three-dimensional network structure in a matrix comprising said ethylene-α-olefinic copolymer (1),
A foam whose main component is a thermoplastic elastomer composition comprising an ethylene-α-olefinic copolymer (1) and a crystalline polyethylenic resin (2), wherein said crystalline polyethylenic resin (2) is in a three-dimensional network structure in a matrix comprising said ethylene-α-olefinic copolymer (1).
A foam whose main component is a thermoplastic elastomer composition comprising as main components an ethylene-α-olefinic copolymer (1), a crystalline polyethylenic resin (2) and a block copolymer (3) described below, wherein said crystalline polyethylenic resin (2) and said block copolymer (3) are in a three-dimensional network structure in a matrix comprising said ethylene-α-olefinic copolymer (1),
A method for producing a foam comprising incorporating 0.01 to 20 parts by mass of a foaming agent to 100 parts by mass of a thermoplastic elastomer composition comprising an ethylene-α-olefinic copolymer (1) and a crystalline polyethylenic resin (2), wherein said crystalline polyethylenic resin (2) is in a three-dimensional network structure in a matrix comprising said ethylene-α-olefinic copolymer (1) followed by foaming.
A method for producing a foam comprising incorporating 0.01 to 20 parts by mass of a foaming agent to 100 parts by mass of a thermoplastic elastomer composition comprising as main components an ethylene-α-olefinic copolymer (1), a crystalline polyethylenic resin (2) and a block copolymer (3) described below, wherein said crystalline polyethylenic resin (2) and said block copolymer (3) are in a three-dimensional network structure in a matrix comprising said ethylene-α-olefinic copolymer (1) followed by foaming,
Dependencies are inferred from the claim text.