Thermoplastic elastomer composition
AssigneeSumitomo Chemical Company, Limited
InventorTakahiro KONISHI
Life of this patent
Estimating the term…
Abstract
Provided is a thermoplastic elastomer composition capable of producing a molded article having a good appearance such as surface smoothness and excellent bondability to another member, the thermoplastic elastomer composition comprising: an ethylene-based polymer (A); and a propylene-based polymer (B), wherein a melt viscosity of the thermoplastic elastomer composition measured at a temperature of 220° C. and a shear rate of 12 sec−1 is 2,500 Pa·sec or less; the thermoplastic elastomer composition has a sea-island structure; and an island portion has a volume average particle diameter of 2.1 μm or more and a particle diameter dispersion D of 7.0 or less.
Claims13
A thermoplastic elastomer composition comprising:
- an ethylene-based polymer (A);
- and
- a propylene-based polymer (B), wherein
- a melt viscosity of the thermoplastic elastomer composition measured at a temperature of 220° C. and a shear rate of 12 sec-1 is 2,500 Pa·sec or less;
- the thermoplastic elastomer composition has a sea-island structure;
- and
- an island portion has a volume average particle diameter of 2.1 μm or more and a particle diameter dispersion D of 7.0 or less.
A method for producing a thermoplastic elastomer composition, comprising a step of melt-kneading an ethylene-based polymer (A) and a propylene-based polymer (B) in the presence of a crosslinking agent (C), wherein
- the ethylene-based polymer (A) has a Mooney viscosity (ML1+4 100° C.) of 40 or more;
- and
- a melt flow rate of the propylene-based polymer (B) measured under conditions of a temperature of 230° C. and a load of 21.18 N is 1.0 to 200 g/10 min.
A method for producing a thermoplastic elastomer composition, comprising a step of melt-kneading an oil-extended polymer and a propylene-based polymer (B) in the presence of a crosslinking agent (C), wherein
- the oil-extended polymer comprises an ethylene-based polymer (A) and a mineral oil (D);
- the oil-extended polymer has a Mooney viscosity (ML1+4 100° C.) of 40 or more;
- and
- a melt flow rate of the propylene-based polymer (B) measured under conditions of a temperature of 230° C. and a load of 21.18 N is 1.0 to 200 g/10 min.
Dependencies are inferred from the claim text.