PURPOSE:To obtain titled composition having specific physical properties, with reduced ply loose in the zone covering the range from the buttress to shoulder in tire, by incorporating rubber with sulfur, organic acid cobalt salt and hard carbon. CONSTITUTION:The objective composition can be obtained by incorporating (A) 100pts.wt. of natural rubber or polyisoprene rubber with (B) 3-7pts.wt. of sulfur, (C) 0.5-5pts.wt. of an organic acid cobalt salt pref. cobalt stearate or cobalt naphthenate, (D) 50-70(pref. 60-70)pts.wt. of hard carbon with a particle size ca. =40mmu, (E) as a curing promotor, pref. 0.5-1.5pts.wt. of NOBS (N-oxydiethylene benzothiazyl sulfenamide) and (F) other ingredient(s). The cured product therefrom has the following mechanical properties; (1) 100% modulus 40-70kg/ cm2, (2) breaking strength =200kg/cm2 (pref. =250kg/cm2), (3) breaking elongation =380%.
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机译：目的：通过将橡胶与硫磺，有机酸钴盐和硬质碳混合，获得具有特定物理性能的标题组合物，从而在覆盖轮胎的从胎肩到胎肩的区域中减少层间的松动。组成：可以通过掺入（A）100pts.wt获得目标组成。 （B）3-7pts.wt的天然橡胶或聚异戊二烯橡胶。硫（C）0.5-5pts.wt。有机酸钴盐的制备。硬脂酸钴或环烷酸钴（D）50-70（优选60-70）pts.wt。的硬碳，颗粒尺寸约为。 <= 40mmu，（E）作为固化促进剂，优选。 0.5-1.5pts.wt。 NOBS（N-氧二亚乙基苯并噻唑基亚磺酰胺）和（F）其他成分。由此得到的固化产物具有以下机械性能; （1）100％模量40-70kg / cm 2，（2）断裂强度> = 200kg / cm 2（优选> = 250kg / cm 2），（3）断裂伸长率> = 380％ 。
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