RUBBER COMPOSITION STYRENE-BUTADIENE BASED FOR OUTSOLE HAVING EXCELLENT HARDNESS CHANGE PROPERTY

摘要

The present invention relates to a styrene-butadiene-based outsole, having excellent hardness change properties. The rubber composition comprises 40-60 parts by weight of two or more kinds of composite silica with different specific surface area from each other; 3-10 parts by weight of an aliphatic metal salt, 2-5 parts by weight of a silane coupling agent, 3-7 parts by weight of a metal oxide, 1-3 parts by weight of a stearic acid, 1-3 parts by weight of an antioxidant, 1-5 parts by weight of a surfactant, 2-5 parts by weight of a process oil, 0.5-1.0 parts by weight of a crosslinking agent, and 0.5-1.5 parts by weight of a crosslinking accelerator based on 100 parts by weight a rubber substrate including a solution-polymerizable styrene-butadiene-based rubber. The rubber composition provides an outsole with excellent mechanical strength and slip resistance while improving grip force by having excellent hardness change properties. [Reference numerals] (AA) Example 1;(BB) Example 2;(CC) Example 3;(DD) Comparative example 1;(EE) Comparative example 2;(FF) Comparative example 3;(GG) Comparative example 4