| 摘要 |
A crosslinkable composition comprising from 30 to 90 percent by weight of an epoxidized monohydroxylated polydiene polymer which is comprised of at least two polymerizable ethenically unsaturated hydrocarbon monomers wherein at least one is a diene monomer which yields unsaturation which is suitable for epoxidation, 8 to 60 percent by weight of an amino resin crosslinking agent, and 2 to 40% by weight of a reinforcing agent. The invention also encompasses a process to make such compositions by prereacting the three components with a small portion of the crosslinking catalyst required to crosslink the composition for 0.5 to 10 hours at 60 DEG to 120 DEG C. The preferred polymer for use herein has the formula (HO)x-A-Sz-B-(OH)y wherein A and B are polymer blocks which may be homopolymer blocks of conjugated diolefin monomers, copolymer blocks of conjugated diolefin monomers, or copolymer blocks of diolefin monomers and monoalkenyl aromatic hydrocarbon monomers, S is a vinyl aromatic hydrocarbon block, x and y are 0 or 1 and either x or y must be 1 but only one at a time can be 1, and z is 0 or 1, and contains from 0.2 to 7.0 meq of epoxy per gram of polymer.
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