Copolymers of ethylene and an a-olefin of formula CH2 = CHR (in which R represents a straight or branched chain C1-C5 alkyl group) or copolymers of ethylene, said a-olefin and a iinear or cyclic diene or higher polyene having non-conjugated double bonds are prepared by polymerization in an inert organic solvent and in the presence of
(a) an organoaluminium compound of formula R'nAlX(3-n) (in which R' represents a C1-C20 hydrocarbon group, X represents a halogen atom or an alkoxy group and n is a number such that 1 ≦ n≦ 3),
(b) a trivalent to pentavalent vanadium compound soluble in an inert organic solvent, and
(c) as a catalyst activator. an ester of a halogenated organic acid.
The polymerization is effected in two reactors connected in series whilst keeping the reactors at different temperature levels. The copolymers produced have excellent processability.
乙烯和式
CH2 = CHR 的 a-烯烃(其中 R 代表直链或支链 C1-C5 烷基)的共聚物,或
乙烯、所述 a-烯烃和具有非共轭双键的线性或环状二烯或高 级多烯的共聚物,是在惰性有机溶剂中,在下列物质存在的情况下,通过聚合反应制备的
(a) 式 R'nAlX(3-n) 的
有机铝化合物(其中 R' 代表 C1-C20 烃基,X 代表卤素原子或 烷氧基,n 为 1 ≦ n≦ 3 的数字)、
(b) 可溶于惰性有机溶剂的三价至五价
钒化合物,以及
(c) 作为催化剂活化剂的卤代有机酸的酯。
聚合反应在两个串联的反应器中进行,同时使反应器保持在不同的温度
水平。生产出的共聚物具有极佳的加工性能。