Method for producing .alpha.-olefin polymers

Details Method for producing .alpha.-olefin polymers Method for producing .alpha.-olefin polymers

1979-03-21

1981-09-01

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252429B, 252429C, 525247, 526 97, 526114, 526116, 526121, 526122, 526124, 526125, 5263486, 526351, C08F 402, C08F 1006

Patent

active

042873282

ABSTRACT:
A method for producing .alpha.-olefin polymers is provided. According to this method, particularly the catalyst stability is improved, resulting in polymers having a higher crystallinity, a narrower range of molecular weight, improved shape of polymer particles with a higher yield per a solid product component and per a transition metal component of the catalyst. Said catalyst is obtained by reacting a trivalent metal halide with a hydroxide, an oxide, a carbonate of a divalent metal, a double compound containing any of these compounds or a hydrate of a compound containing a divalent metal to form a solid product (I); reacting said solid product with one or more electron donors and one or more electron acceptors separately or simultaneously each in one to 10 steps but using TiCl.sub.4 as said acceptor(s) in at least one step to obtain a solid product (II); and then combining said solid product (II) with an organoaluminum compound and an electron doner, but before being used in polymerization, at least one part or the whole of said catalyst components is subjected to a polymerization-treatment with an .alpha.-olefin in the coexistence of at least both of said solid product (II) and said organoaluminum compound to form a preliminarily activated catalyst.

REFERENCES:
patent: 3900454 (1975-08-01), Sato et al.
patent: 4027087 (1977-05-01), Satoh et al.
patent: 4103078 (1978-07-01), Sato et al.

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