Patent ID: 6342567
Filing Date: 2002-01-29
Classification: C08L

Abstract:
A process for producing a rubber composition which comprises:(a) kneading at least one low air permeable rubber having a vulcanizable functional group and a curing agent, which can vulcanize the low air permeable rubber having the vulcanizable functional group, at a temperature within a range where the low air permeable rubber having the vulcanizable functional group is not vulcanized, and (b) blending 25 to 100 parts by weight of at least one rubber having a vulcanizable carbon-carbon double bond per 100 parts by weight of the low air permeable rubber having the vulcanizable functional group with the kneaded product, kneading at a temperature within a range where the low air permeable rubber having the vulcanizable functional group can be vulcanized to selectively vulcanize the low air permeable rubber having the vulcanizable functional group, wherein the temperature range for kneading in step (a) is from 40Â° to 100Â° C., the temperature range for kneading in step (b) is from 90Â° to 140Â° C., and the kneading temperature of step (a) is lower than that of step (b).