| abstract |
PURPOSE: The titled composition capable of greatly improving the corrosion fatigue resistance of a reinforcing steel cord and useful for steel radial tires, prepared by further adding boric acid (metal salt) to a composition prepared by adding a primary fatty acid metal salt to a rubber component. n CONSTITUTION: In a compounded composition prepared by adding 0.5W10pts.wt. 6W10C primary fatty acid metal salt (e.g., cobalt caproate) or both of 0.5W 5pts.wt. above metal salt and 0.5W5pts.wt. different organic acid cobalt salt (e.g., cobalt naphthenate) to 100pts.wt. at least one rubber component selected from the group consisting of natural rubber, synthetic polyisoprene rubber and polybutadiene rubber; boric acid (e.g., orthoboric acid) or a metal borate (e.g., zinc orthoborate) is further added in an amount of 0.1W5pts.wt. per 100pts.wt. rubber component. The corrosion fatigue resistance can further be improved synergistically without detriment to the stability of bonding between steel cord and rubber. n COPYRIGHT: (C)1983,JPO&Japio |