Curable organosiloxane-polyisobutylene mixtures

Details Curable organosiloxane-polyisobutylene mixtures Curable organosiloxane-polyisobutylene mixtures

1998-12-10

1999-09-14

Dawson, Robert

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524588, 524862, 524849, 524847, 524493, 525106, C08L 8307

Patent

active

059524197

ABSTRACT:
A curable organosiloxane-polyisobutylene composition comprising 20 to 87 weight percent of a polyisobutylene comprising at least 2 alkenyl groups per molecule, 0.4 to 70 weight percent of a polyorganosiloxane comprising at least 2 silicon-bonded alkenyl groups per molecule, 7 to 50 weight percent of a treated reinforcing silica filler, an amount sufficient to cure the composition of an organohydrogensiloxane crosslinker, and a platinum-group metal hydrosilation catalyst in an amount sufficient to effect curing of the composition. Cured elastomers prepared from the compositions can have improved resistance to gas and vapor permeability.

REFERENCES:
patent: 3328482 (1967-06-01), Northup et al.
patent: 4753978 (1988-06-01), Jensen
patent: 4831081 (1989-05-01), King, III et al.
patent: 5447990 (1995-09-01), Noda et al.
patent: 5672660 (1997-09-01), Medsker et al.

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