申请人:TOA NENRYO KOGYO KABUSHIKI KAISHA
公开号:EP0145368A2
公开(公告)日:1985-06-19
A process for producing block copolymers which comprises the steps of
(a) polymerizing propylene in the presence of a catalyst to give a crystalline propylene polymer, and
(b) copolymerizing ethylene and at least one kind of alpha-olefin in the presence of said catalyst and said polymer,
said catalyst comprising
(A) a catalyst component obtained by contacting with one another
1) a magnesium alkoxide,
2) a silicon compound having the hydrogen-silicon bond,
3) an electron donor compound, and
4) a titanium compound
(B) an organic compound of a metal in Group I to III of the Periodic Table, and
(C) an organosilicon compound represented by the formula RpSiXm(OR')n, wherein R and R' are the same or different C,-20 hydrocarbon groups, X is a halogen atom, 0 ≤ p ≤ 4, 0 ≤ m ≤ 4, 0 ≤ n ≤ 4, and p + m + n = 4.
一种生产嵌段共聚物的工艺,包括以下步骤
(a) 在催化剂存在下聚合丙烯,得到结晶丙烯聚合物,和
(b) 在上述催化剂和上述聚合物存在下,使乙烯和至少一种α-烯烃共聚、
所述催化剂包括
(A) 通过相互接触获得的催化剂组分
1) 一种氧化镁
2) 具有氢硅键的硅化合物
3) 电子供体化合物
4) 钛化合物
(B) 元素周期表第 I 至 III 族金属的有机化合物,和
(C) 由式 RpSiXm(OR')n 表示的有机硅化合物,其中 R 和 R'为相同或不同的 C,-20 碳氢基团,X 为卤素原子,0≤p≤4,0≤m≤4,0≤n≤4,且 p + m + n = 4。