| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition which prevents a mold from being contaminated and is usable for a tire composing member in contact with the mold during tire production by compounding a specific amount of a water-insoluble aliphatic ester mixture containing 9-octadecenyl 9-octadecenoate as a major component with a source rubber. SOLUTION: A composition is obtained by compounding 0.5 to 5 pts.wt. of a water-insoluble aliphatic ester mixture containing 9-octadecenyl 9- octadecenoate represented by the formula: C8H17CH=CHC2H4COOC8H16CH= CHC8H17 as a major component, preferably containing 30 to 100 wt.% of the ester with 100 pts.wt. of a source rubber whereby bleeding of an agent mixed in a rubber is suppressed and then tire appearance and rubber properties are improved and further frequency of cleaning the mold can be decreased to speed up tire production. The source rubber to be used is a diene-based rubber such as NR, IR, SBR, NBR, IIR and the like.
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