Soft, heat and fatigue resistant elastomeric articles
US4362840A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1980 |
| Grant date | Dec 7, 1982 |
| Priority date | — |
| Expiry date | Oct 1, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L21/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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 par…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.