Process for preparing a catalyst for polymerization or copolymerization of ethylene

Claim 1

A process for preparing a catalyst for polymerization or copolymerization of ethylene, which comprises reacting a silicone compound (I) and an organomagnesium compound (II) to obtain a product (A), reacting the product (A) with a titanium compound (III) and a silicone halide compound (IV) to obtain a product (B), reacting the product (B) with an organoaluminum halide compound (V) to obtain a solid component (C), and bringing the solid component (C) in contact with an organoaluminum compound (VI), wherein: (1) said silicone compound (I) is at least one member selected from the group consisting of a hydropolysiloxane compound of the formula R 4 a H b SiO.sub.(4-a-b)/2 where R 4 is a monovalent organic group selected from the group consisting of an alkyl group, an aryl group, an aralkyl group, an alkoxy group and an aryloxy group, a is an integer of from 0 to 2, and b is an integer of from 1 to 3, provided that a+b≦3, a compound of the formula R 5 n Si(OH) 4-n wherein R 5 is a monovalent hydrocarbon group having from 1 to 18 carbon atoms and n is an integer of from 1 to 3, and a condensate thereof; (2) said organomagnesium compound (II) is a compound of the formula (MgR 6 2 ) p . (R 6 MgX) q wherein R 6 is a hydrocarbon group, X is a halogen atom, and each of p and q is a number of from 0 to 1, provided that p+q=1; (3) said titanium compound (III) is a compound of the formula Ti(OR 2 ) m X 4-m wherein R 2 is a hydrocarbon group having from 1 to 12 carbon atoms, X is a halogen atom, and m is a number of from 0 to 4; (4) said silicone halide compound (IV) is a compound of the formula R 1 L SiX 4-L wherein R 1 is a hydrogen atom or a hydrocarbon group having from 1 to 8 carbon atoms, X is a halogen atom and L is a number of from 0 to 3; (5) said organoaluminum halide compound (V) is a compound of the formula R 3 c AlX 3-c wherein R 3 is a hydrocarbon group having from 1 to 12 carbon atoms, X is a halogen atom, and c is a number of from 1 to 2; and (6) the organoaluminum compound (VI) is a compound of the formula R d AlY 3-d wherein R is a monovalent hydrocarbon group, Y is a hydrogen atom, a halogen atom or an alkoxy group, and d is a number of from 1 to 3.