Vulcanizable rubber composition improved in sulfur blooming with

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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260775, 260785, 525332, 525335, 525340, 525346, 525349, 525352, C08F 834, C08C 1900

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active

042424720

ABSTRACT:
The present invention relates to a vulcanizable rubber composition improved in a sulfur blooming obtained by coagulatingly keeping a supersaturated sulfur within said rubber composition. For preventing said sulfur blooming, in the present invention, a surface active agent such as sodium or potassium ethylxanthate, sodium or potassium isopropylxanthate, dialkyldithiophosphoric acid, diphenylthiourea, mercaptobenzothiazole, diphenylthiocarbazone, sodium oleate, sodium stearate or octadecylamineacetate is added to a rubber composition obtained by compounding sulfur as a vulcanizing agent in the amount of 0.5 to 10 parts by weight in relation to 100 parts by weight of rubber which may be any of natural rubber, synthetic rubber and the mixtures thereof.

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