| 摘要 |
<p>The invention comprises sulphur vulcanizable compositions comprising (a) a copolymer of an ethylenically unsaturated glycidyl ether and at least one monomer selected from alkyloxiranes, alkyloxetanes and oxetane, and (b) at least one other sulphur-curable material. Suitable unsaturated glycidyl ethers are allyl, methallyl, vinyl-cyclohexyl, a -terpinyl, o-allylphenyl- and crotylphenyl glycidyl ethers. Specified alkyloxiranes are propylene, hexene, butene, hexadecene and octadecene oxides; specified alkyloxetanes are 2-butyl-, and 2-octyloxetanes. The copolymer preferably contains 0.5 to 15% of glycidyl ether. Specified sulphur-curable materials are styrene/butadiene, acrylonitrile/butadiene, and isoprene/isobutylene copolymers, cis-polybutadiene, cis-polyisoprene and natural rubber. Suitable vulcanizing agents contain sulphur and an accelerator, e.g. thiuram sulphides or triazole compounds, and may optionally contain accelerator activators, e.g. metal oxides or stearic acid, stabilizers and age resistors. The vulcanizable composition may be in the form of a blend or laminate (see Division B5). The examples describe the covulcanization of propylene oxide/allyl glycidyl ether copolymer with (1) styrene butadiene rubber, (2), (6) and (7) natural rubber, (3) acrylonitrile/butadiene rubber, (4) butyl rubber; of (5) trimethylene oxide/allyl glycidyl ether copolymer with natural rubber; and (8) propylene oxide/o-allylphenyl glycidyl ether copolymer with acrylonitrile/butadiene rubber. Specifications 898,306 and 980,093 are referred to.</p> |
