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 nitro compound, a phosphoryl chloride compound of the formula:
wherein R¹ to R⁴ are independently an alkyl group, and an aminosilane compound of the formula:
wherein R⁵ to R⁷ are independently an alkyl group or an alkoxyl group, R⁸ and R⁹ are independently an alkyl group, and n 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,该工艺包括制备含碱
金属 的共轭二烯聚合物,并将该含碱
金属聚合物与选自以下组别的改性剂反应:
硝基化合物、 式中的
磷酰
氯化合物、式中的
氨基
硅烷化合物、式中的
氨基
硅烷化合物、式中的
氨基
硅烷 化合物:
式中 R¹ 至 R⁴ 独立地为烷基,以及式中
氨基
硅烷化合物:
其中 R⁵ 至 R⁷ 独立地为烷基或烷氧基,R⁸ 和 R𠞙 独立地为烷基,且 n 为整数、
所述含碱
金属的二烯聚合物是通过使用碱
金属基催化剂的活阴离子聚合反应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的加成反应制备的。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。