It is sometimes advantageous to disperse crystalline polymers throughout rubbery elastomers. For instance, the cold flow characteristics and green strength of polydiene rubbers can be improved by dispersing syndiotactic-1,2-polybutadiene therein. This invention discloses a process for preparing a highly dispersed blend of a crystalline polymer in a rubbery elastomer which comprises (1) polymerizing at least one diene monomer in an organic solvent under solution polymerization conditions to form a polymer cement of the rubbery elastomer in the organic solvent, (2) polymerizing additional monomers in the polymer cement into the crystalline polymer to form a rubbery cement having the crystalline polymer dispersed therein, and (3) recovering the highly dispersed blend of the crystalline polymer in the rubbery elastomer from the organic solvent in the rubber cement.
有时,将结晶聚合物分散到橡胶弹性体中会带来好处。例如,通过在聚二烯橡胶中分散
辛二烯-1,2-聚
丁二烯,可以改善聚二烯橡胶的冷流特性和生坯强度。本发明公开了一种在橡胶弹性体中制备高度分散的结晶聚合物混合物的工艺,该工艺包括 (1) 在溶液聚合条件下,在有机溶剂中聚合至少一种二烯烃单体,在有机溶剂中形成橡胶弹性体的聚合物胶结物、(2) 将聚合物胶结物中的其他单体聚合到结晶聚合物中,形成其中分散有结晶聚合物的橡胶胶结物,以及 (3) 从橡胶胶结物中的有机溶剂中回收橡胶弹性体中高度分散的结晶聚合物混合物。