Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-12-05
1997-10-14
Zemel, Irina S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525193, 525240, C08L 2316
Patent
active
056773820
ABSTRACT:
An ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber composition comprising a low molecular weight component copolymer composed of an ethylene-.alpha.-olefin-non-conjugated diene copolymer having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 10 to 150, an .alpha.-olefin content of 30 to 60% by weight and an iodine value of 37 to 65, and a high molecular weight component copolymer composed of an ethylene-.alpha.-olefin-non-conjugated diene copolymer having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 100 to 500, an .alpha.-olefin content of 15 to 50% by weight and an iodine value of 3 to 15, the ratio of the iodine value of the low molecular weight component copolymer to the iodine value of the high molecular weight component copolymer being at least 4/1. The above composition can inhibit a gel from being produced during processing and achieve a high degree of cross-linking and is excellent in compression set, shape-retention and sponge surface skin.
REFERENCES:
patent: 4722971 (1988-02-01), Datta et al.
patent: 5242971 (1993-09-01), Nakahama
patent: 5449713 (1995-09-01), Nakahama
Japio, AN 92-080245, JP-A-4 080 245, Mar. 13, 1992.
Gotoh Hidekatsu
Mori Yoji
Morikawa Akihiko
Tsuji Shoei
Tsutsumi Fumio
Japan Synthetic Rubber Co. Ltd.
Zemel Irina S.
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