Patent ID: 6329457
Filing Date: 2001-12-11
Classification: C08K,C08L

Abstract:
A vulcanized rubber composition which comprises the vulcanization reaction product of:A) 100 parts by weight of at least one natural or synthetic rubber;B) 0.1 to 25 parts by weight of sulfur and/or a sufficient amount of a sulfur donor to provide the equivalent of 0.1 to 25 parts by weight of sulfur;C) 10-100 parts by weight of at least one silica filler,D) 0.1 to 5 parts by weight of at least one anti-reversion coagent represented by the general formula II:Q.sub.1 -D-(Q.sub.2).sub.p (II);wherein D, optionally containing one or more groups selected from nitrogen, oxygen, silicon, phosphorus, boron, sulphone, sulphoxy, polysulfide and sulfur, is a monomeric or oligomeric divalent, trivalent or tetravalent group, p is an integer selected from 1, 2 or 3, Q.sub.1 and Q.sub.2 are independently selected from the formulas III and IV: ##STR4##wherein R.sub.4, R.sub.5 and R.sub.6 are independently selected from hydrogen, C.sub.1 -C.sub.18 alkyl groups, C.sub.3 -C.sub.18 cycloalkyl groups, C.sub.6 -C.sub.18 aryl groups, C.sub.7 -C.sub.30 aralkyl groups and C.sub.7 -C.sub.30 alkaryl groups and R.sub.5 and R.sub.6 may combine to form a ring when R.sub.4 is hydrogen; B and B.sub.1 are independently selected from oxygen and sulfur; andE) 0.1 to 25 parts by weight of at least one cure-improving resin to significantly increase the delta torque of the rubber composition during the vulcanization process as compared to the delta torque of a similar rubber composition in the absence of the cure-improving resin.