Procedure for the obtention of thermoplastic elastomer mixtures

Details Procedure for the obtention of thermoplastic elastomer mixtures Procedure for the obtention of thermoplastic elastomer mixtures

1990-12-13

1993-03-30

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 88, 525 98, 525227, 525240, 525263, C08L 2304, C08L 5302, C08L 3306

Patent

active

051984962

ABSTRACT:
Following this procedure for the production of thermoplastic elastomer mixtures, dynamic vulcanization is performed at temperatures ranging between approximately 125 and 250 deg. C. and preferably between 150 and 200 deg. C., and with the aid of a free radical generating agent, on a mixture made up of: a) 95-60% by weight of one or several thermoplastic block copolymers of a monoalkenylarene and a coupled diene having at least two end blocks of monoalkenylarene polymer A and at least one middle block of a polymer of coupled diene O the content of said block A ranging between approximately 8 and 55% by weight respect to the copolymer, whose flow rate must exceed 0.01 and b) 5-40% by weight of one or several copolymers of ethylene and vinyl acetate, containing approximately between 5 and 50% by weight of vinyl acetate, preferably between 15 and 35% of vinyl acetate and with a flow rate between approximately 0.1 and 50, preferably between 0.1 and 10.
The partially reticulated mixtures prepared in accordance with the invention show a high resistance to ozone, to ultraviolet radiation, against tearing, and an improved resistance to solvents and abrasion.

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Concise Chemical and Technical Dictionary pp. 978-979, Chem. Pub. Co., Inc. 1947 Brooklyn, N.Y.

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