A process for preparing modified diene polymer rubbers having an increased impact resilience and a reduced hardness at low temperatures and useful as rubber materials for automobile tires and other industries which comprises producing an alkali metal-containing conjugated diene polymer, and reacting the alkali metal-containing polymer with a modifier selected from the group consisting of a nitroalkyl acrylate of the formula:
wherein R¹ and R² are independently an alkyl group and n is an integer, and a nitroamino compound of the formula:
wherein R³ to R⁶ are independently an alkyl group, and m is an integer, said alkali metal-containing diene polymer being prepared by a living anionic polymerization using an alkali metal-based catalyst or by an addition reaction of a diene polymer having conjugated diene units and an alkali metal-based catalyst in a hydrocarbon solvent. The modified diene polymers can be incorporated with usual rubber additives to provide rubber compositions for various purposes, and the cured products show an increased impact resilience and a reduced hardness at low temperatures.
一种用于制备改性二烯聚合物橡胶的工艺,该橡胶在低温下具有更高的冲击回弹性和更低的硬度,可用作汽车轮胎和其他工业的橡胶材料,该工艺包括生产一种含碱
金属的共轭二烯聚合物,并使该含碱
金属聚合物与一种改性剂反应,该改性剂选自由以下组成的组
其中 R¹ 和 R² 独立地为烷基且 n 为整数,以及式中的硝基
氨基化合物:
其中 R³ 至 R⁶ 独立地为烷基,且 m 为整数,所述含碱
金属的二烯聚合物是通过使用碱
金属基催化剂进行活阴离子聚合或通过具有共轭二烯单元的二烯聚合物与碱
金属基催化剂在烃溶剂中进行加成反应制备的。改性二烯聚合物可与通常的橡胶添加剂结合,提供各种用途的橡胶组合物,固化产品在低温下显示出更高的冲击回弹性和更低的硬度。