Method for producing ethylene polymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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252429B, 252429C, 526114, 526115, 526121, 526122, 526124, 526125, 526347, 526348, 526350, 526352, 526906, C08F 402, C08F 1002

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039872335

ABSTRACT:
In a method for producing a polymer or a copolymer of ethylene carried out in the presence of a catalyst obtained by a combination of a solid product containing a transition metal of the fourth a or fifth a group and an organoaluminum compound, an improvement has been made to provide a catalyst having such an efficiency as being capable of omitting ash-removal step and providing a high production yield of polymer per unit volume of polymerization vessel per hour and a polymer having a high B.D. Said catalyst can be obtained by (1) reacting a halide of trivalent metal (A) with a divalent metal compound or its derivative (B) such as hydroxide, oxide or carbonate thereof, or hydrate of these, to produce a solid product (I); (2) reacting said solid product (I) with a chain or cyclic polysiloxane having a general formula of ##EQU1## WHEREIN R.sub.1 and R.sub.2 are same or different kinds, and each mean hydrogen atom, alkyl, aryl, halogen atom, alkoxy, aryloxy radical or a residual radical of an aliphatic carboxylic acid and n is a number in the range of 3-10,000 to produce a solid product (II), and (3) further reacting said solid product (II) with a liquid transition metal compound (D) to produce a solid product (III).

REFERENCES:
patent: 3718636 (1973-02-01), Stevens et al.
patent: 3900454 (1975-08-01), Sato et al.
patent: 3907759 (1975-09-01), Okada et al.

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