| 摘要 |
PROBLEM TO BE SOLVED: To obtain an environmentally friendly CR composition exhibiting rubber characteristics equivalent to those of conventional SBR compositions by using a vulcanization promoter generating no nitrosamine. SOLUTION: This environmentally friendly SBR composition is characterized by being obtained by compounding a CR composition with, as a vulcanizing system, 0.1-5 pt(s).wt. of at least one vulcanizing agent selected from the group consisting of zinc oxide and magnesium oxide and 0.1-5 pt(s).wt. of a tetrakis(alkyl)thiuram disulfide each based on 100 pts.wt. of the rubber component of the above CR composition. Because of compounding a specified amount of the tetrakis(alkyl)thiuram disulfide as the vulcanization promoter of the vulcanization system, there are such advantages that the CR after vulcanized generates no toxic nitrosamine and causes no deterioration of its rubber characteristics.
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