Thermoplastic elastomer

Details Thermoplastic elastomer Thermoplastic elastomer

1989-12-22

1991-01-15

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...

525240, 525211, 525193, 525 88, 525 97, 524528, C08L 2326, C08L 2316, C08L 2304, C08L 2310

Patent

active

049855026

ABSTRACT:
A thermoplastic elastomer with well-balanced physical properties is prepared by treating a rubber/resin composition comprised of (a) 45-90 wt. parts of a rubbery component and (b) 10-55 wt. parts of a polyolefin resin, with a curing agent. The rubbery component (a) is comprised of 5-100 wt. % of an ethylene-propylene copolymer rubber having an ethylene content of 60-78 mole %, a crystallinity of 4 to 20%, a maximum peak temperature of melting of at least 100.degree. C., an MFI of less than 0.01 at 230.degree. C., an HLMFI/MFI of at least 35, an Mw/Mn of at least 4, and a tensile strength at break of at least 100 kg/cm.sup.2, and 95-0% by weight of an ethylene-propylene-nonconjugated diene copolymer. The rubbery component in the cured product has a gel content more than 80 wt. % and less than 97 wt. % as determined by immersion in cyclohexane at 23.degree. C. for 48 hours.

REFERENCES:
patent: 3806558 (1974-04-01), Fischer
patent: 4104210 (1978-08-01), Coran et al.
patent: 4130535 (1978-12-01), Coran et al.
patent: 4311628 (1982-01-01), Sabet et al.
patent: 4822855 (1989-04-01), Kobayashi et al.

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