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US 4,694,049 AGranted
Thermoplastic elastomer composition
AssigneeToyo Boseki Kabushiki Kaisha T/A Toyobo Co., Ltd.
InventorsIchiro Morita, Tadao Taika, Hidehiro Nakamura
Life of this patent
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Abstract
Thermoplastic elastomer composition comprising 100 parts by weight of a polyester block copolymer and 0.05 to 20 parts by weight of a liquid diphenylmethane diisocyanate, which has a stable high melt viscosity with less variation of viscosity in the production lots and has also excellent flexural fatigue resistance and water resistance and is useful for the production of hollow shaped products such as bellows and section profiles such as moldings by blow molding or extrusion molding.
Claims7
A thermoplastic elastomer composition, which comprises:
- 100 parts by weight of a thermoplastic polyester block copolymer comprising a polyester segment having a high melting point and a polymer segment having a low melting point and having a molecular weight of 400 to 6,000 wherein a polymer produced from the polyester segment having a high melting point alone has a melting point of not lower than 150.degree. C. and the polymer segment having a low melting point alone has a melting or softening point of not higher than 80.degree. C., and
- 0.05 to 20 parts by weight of a liquid diphenylmethane diisocyanate comprising a mixture of pure diphenylmethane diisocyanate and a cycloadduct of the formula:
- ##STR2## in said mixture of the pure diphenylmethane diisocyanate and the cycloadduct, these being in the molar ratio of the cycloadduct/pure diphenylmethane diisocyanate of 0.02 to 0.5/1.
Dependencies are inferred from the claim text.