To provide a high-elongation rubber vulcanizate mainly consisting of a diene rubber having double bonds in the main chain, tackified by the addition of a specified tackifier, and exhibiting an excellent elongation at break even in a high-hardness region.
The high-elongation rubber vulcanizate is obtained by vulcanizing a rubber composition containing at least the below-mentioned components (A) and (B) and has a hardness of at least 65 as measured by JIS K6253 and an elongation at break of at least 200% as measured according to JIS K6251. The above-mentioned components (A) to (B) are (A): a diene rubber having double bonds in the main chain, and (B) rosin having a softening temperature of 90 to 120°C and an acid value of 90 to 120. In a desirable embodiment, the rubber vulcanizate has an elongation at break of at least 300% as measured according to JIS K6251.
Toru Nakayama
Masayuki Enomoto
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