Ford Motor Company Limited

Marvin A Lemieux

Paul C Killgoar, Jr

Ares N Theodore

Ronald J Tabar

This invention relates to the use of particular urethane or urethane/sulfur cured acrylonitrile-butadiene elastomers in systems wherein a vulcanizate component with resistance to oxidized (sour) hydrocarbon fuel is desired, that is in systems wherein a vulcanizate functions in contact with hydrocarbon fuel having oxidation products therein. The vulcanizate composition consists essentially of the reaction produces of (i) 100 parts by weight of an acrylonitrile-butadiene copolymer and (ii) a curative comprising 1-10 parts by weight of a urethane curing agent, wherein the urethane curing agent is the reaction product of a nitrosophenol and a diisocyanate. The curative may additionally comprise sulfur.

Use of urethane cured nitrile elastomer as oxidized fuel resistant

A soft, heat and fatigue resistant vulcanizate adapted for transmitting load between moving mechanical parts comprising (a) 100 parts by weight of crosslinked elastomer consisting essentially of (i) natural or synthetic polyisoprene rubber, and (ii) elastomeric polybutadiene made from monomers consisting essentially of butadiene at a weight ratio of (i) to (ii) of about 1:10 to 10:1, (b) about 10-75 parts by weight of substantially internally saturated, substantially linear polymer that (i) is made from monomers consisting essentially of isobutylene, (ii) is a strain crystallizable, elastic solid at 20.degree. C. and (iii) has a viscosity average molecular weight (Flory) above about 1.3 million, (c) said elastomer being crosslinked with a curative comprising a curing agent selected from the group consisting of (i) a sufficient amount of sulfur to provide an efficient or semi-efficient vulcanization of said crosslinkable elastomer, (ii) isocyanate or blocked isocyanate in an amount sufficient to crosslink said crosslinkable elastomer and (iii) isocyanate or blocked isocyanate and sulfur in amounts sufficient to crosslink said crosslinkable elastomer and (d) 5-200 parts by weight particulate comprising carbon black, wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.

Soft, heat and fatigue resistant elastomeric articles

A thick, highly filled, shaped elastomeric body comprising a thermally conductive elastomer suitable for high temperature, e.g. 240.degree.-260.degree. C., mechanical applications. The elastomer composition comprises organopolysiloxane, particulates, and a viscosity modifier. The organopolysiloxane crosslinks between the vinyl or allyl functionality of an organopolysiloxane polymer and the silyl hydride functionality of an organopolysiloxane oligomer. The particulates comprise silica as well as a thermally conductive boron refractory powder, preferably boron nitride. The addition of a viscosity modifier comprising silicone oil is essential to the inclusion of the high levels of particulates.

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Southfield, MI, United States of America

Marvin A Lemieux