| 摘要 |
Vulcanized elastomers derived from functional liquid diene prepolymers which have properties which make them satisfactory for use as the principal component of mixes serving for the manufacture of pneumatic tires can be prepared by a process which comprises, in general, forming a vulcanizable mix of a functional liquid diene prepolymer having reactive mobile hydrogen functions and having a degree of functionality of between 1.8 and 2.0 and a hydrocarbon chain lengthening bifunctional compound having reactive isocyanate groups in a certain ratio, and conducting chain lengthening and vulcanizing operations in two separate sequential heating stages.
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