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Adhesives and Rubbers

Thermoplastic-elastomer-composition

***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE*** Homogeneous-heterogeneous catalyst system for polyolefins

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Process for making a drag shield for a power mower

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Graft polymers of vinyl chloride on unsaturated olefinic elastomers and process for the preparation thereof

Having thus described our invention, what we desire to secure by Letters Patent and hereby claim is:...

Method of polymerizing vinyl halide with olefin polymers and copolymers and compositions thereof

What is claimed is: 1. In a process for the preparation of a vinyl chloride polymer comprising ...

Method of preparing vinyl halide polymers and copolymers with polyolefins

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Ceramic tile adhesive water resistant compositions based on copolymers emulsions

I claim: 1. A ceramic tile adhesive composition containing from 20 to 90% by weight of the total ...

Thermoplastic elastomer composition

Details

Inventors: Morita, Ichiro; Taika, Tadao; Nakamura, Hidehiro;
Assignee: Toyo Boseki Kabushiki Kaisha T/A Toyobo Co., Ltd. (Osaka, JP)
Primary Examiner: Short; Patricia A.
Assistant Examiner:
Attorney, Agent or Firm:

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.

DETAILED DESCRIPTION OF THE INVENTION The thermoplastic elastomer composition of the invention comprises 100 parts by weight of a polyester block copolymer and 0.
05 to 20 parts by weight of a liquid diphenylmethane diisocyanate (MDI).
According to the present invention, the polyester block copolymer and the liquid MDI can uniformly be mixed to give a composition having a high melt viscosity with less variation of the qualities in the production lots, and further, the product has advantageously an improved water resistance.
The polyester block copolymer used in the present invention is 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.
The polymer segment having a low melting point is contained in the ratio of 5 to 80 % by weight, preferably 20 to 80 % by weight, based on the whole weight of the polyester block copolymer.
The polyester composing the polyester segment having a high melting point includes polyesters obtained from an aromatic dicarboxylic acid (e.
g.
terephthalic acid, isophthalic acid, 1,5-dinaphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, bibenzoic acid, bis(p-carboxyphenyl)methane, 4,4'-sulfonyldibenzoic acid, etc.
) and a diol having a low molecular weight (e.
g.
ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentamethylene glycol, 2,2-dimethyltrimethylene glycol, 1,6-hexamethylene glycol, decamethylene glycol, p-xylylene glycol, cyclohexanedimethanol, etc.
); copolyesters obtained from two or more kinds of the above aromatic dicarboxylic acids and two or more kinds of the above diols; polyesters derived from an oxyacid such as p-(

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