| 摘要 |
To provide a hydrocarbon resin for improving rubber compositions, wherein the hydrocarbon resin has improved durability, abrasion resistance, stretch, and productivity, while retaining puncturing strength and tear strength of vulcanized rubber products such as tires and the like; and to also provide a rubber composition comprising the hydrocarbon resin, or vehicle tire obtained from the rubber composition, Hydrocarbon resin having ethylidene group is obtained by copolymerization of raw materials including 40 to 95 parts by weight of a component A which is included of cyclopentadiene compounds and/or a Diels-Alder reaction addition product with a specific chemical structure, 5 to 60 parts by weight of a component B which includes compounds with specific structure equivalent to 1:1 Diels-Alder reaction of 5-ethylidenenorbornene-2 and/or 5-ethylidenemethylnorbornene-2, and cycolpentadiene and/or methylcyclopentadiene. If wished, 0 to 50 parts by weight of unsaturated aromatic hydrocarbon fraction obtained by pyrolysis of petroleum can be copolymerized. The hydrocarbon resin is thought to have a specific chemical structure having many highly reactive carbon-carbon unsaturated bonds on its side chains.
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