Soft, heat and fatigue resistant elastomeric articles

Details Soft, heat and fatigue resistant elastomeric articles Soft, heat and fatigue resistant elastomeric articles

C - Chemistry, Metallurgy

08

K

400/1110, 400/11

C08K 5/16 (2006.01) C08L 7/00 (2006.01) C08L 9/00 (2006.01) C08L 21/00 (2006.01)

Patent

CA 1169180

ABSTRACT OF THE DISCLOSURE A soft, heat and fatigue resistant vulcanizate adapted for transmitting load between moving parts comprising (a) 100 parts by weight of crosslinked elastomer consisting essentially of (1) natural or synthetic polyisoprene rubber and (11) elastomeric polybutadiene made from monomers consisting essentially of butadiene, at a weight ratio of (1) to (11) of about 1:10 to 10:1, (b) about 15 to 55 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°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 to 200 parts by weight particulate, wherein said polymer of (b) is dispersed throughtout said elastomer of (a) in a discrete microscopic phase.

386904

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