CURING RUBBER BAG HAVING SELF-RELEASE FROM CURABLE OR CURED HYDROCARBON RUBBER AND LOW ADHESION THERETO

摘要

PURPOSE: To prevent an expanding and curing bag used for vulcanizing a hydrocarbon substance from adhering to a tire by a method wherein the outer surface of the bag is made of a reaction product produced by blending a polar polymer with a hydrogenated polybutadiene. ;CONSTITUTION: The outer surface of a curing bag used for making a pneumatic tire is made of a reaction product produced by melting and blending a brominated p-methylstyrene-isobutylene copolymer with one or more kinds of polar polymers. The polar polymer is a copolymer prepared by reacting a glycol having carbon atoms with a phosgene. A reaction product having a shear stress is produced by melting and blending the copolymers at a temperature of 90-220°C. The outer surface of the bag made of the reaction product can have a thermal stability and physical properties. Since the outer surface of the bag has a low adhesion to a hydrocarbon rubber substance, the adhesion of the bag to the tire can be prevented without using a releasing agent.;COPYRIGHT: (C)1995,JPO