Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-05-20
1999-11-30
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525282, C08L 4700, C08C 1925, C08C 1922
Patent
active
059944650
ABSTRACT:
There is provided a rubber composition and a rubber article for pharmaceutical chemicals or medical treatments, obtained by forming and cross-linking this rubber composition, the rubber article having very excellent properties which can be adapted to the standard test values of various official documents, required in this field, and can further satisfy the test items having lately become an important problem from the pharmaceutical standpoint. This rubber composition comprises 0.3 to 3.5 parts by weight of an organic peroxide cross-linking agent, 0.3 to 4 parts by weight of an organic compound having at least 2 maleimide groups in one molecule and optionally, 0.6 to 30 parts by weight of an organosilicone compound per 100 parts by weight of a isobutylene-isoprene copolymer rubber.
REFERENCES:
patent: 2925407 (1960-02-01), Goldberg
patent: 3835075 (1974-09-01), Boutsicaris
patent: 4136132 (1979-01-01), Poole
patent: 4444948 (1984-04-01), Hochstrasser
patent: 5010137 (1991-04-01), Umeda
Kawachi Eiji
Kawachi Yasushi
Muraki Tomoyasu
Sudo Morihiro
Daikyo Gomu Seiko Ltd.
Henderson Christopher
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