Thermoplastic olefin elastomer

Details Thermoplastic olefin elastomer Thermoplastic olefin elastomer

1986-04-30

1987-12-15

Seccuro, Carman 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 93, 525222, C08L 2310, C08L 2316, C08L 2308

Patent

active

047134194

ABSTRACT:
There is provided a thermoplastic olefin elastomer of polyblend composed of 30 to 70 wt % of ethylene-propylene-diene terpolymer (EPDM), 10 to 30 wt % of ethylene-vinyl acetate copolymer (EVA), and 20 to 50 wt % of polypropylene (PP). The EPDM is specified by the Mooney viscosity, propylene content, and third component. The EVA is specified by the VA content and number-average molecular weight. The PP is specified by the number-average molecular weight. This elastomer is suitable for use as a raw material for automotive exterior trim such as side molding, bumper, and mud guard which are produced by injection molding. The elastomer also affords molded items having a good matte-finished appearance. The polyblend obviates the process for partial crosslinking which was necessary for the preparation of conventional elastomer for injection molding.

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patent: 4255323 (1981-03-01), Barkis et al.
patent: 4481334 (1984-11-01), Yoshimura et al.

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