Nissan Chemical Industries Limited

Takeshi Iwabuchi

Hiroshi Morinaga

Sakae Kamiyama

Masao Kawahara

Kazumi Tsubaki

Terumi Sato

Yoshiho Matsuo

Naotake Okada

Muneto Yokota

Shigeharu Yamamoto

A process for polymerizing or copolymerizing ethylene, characterized in that ethylene or a mixture of ethylene with other .alpha.-olefin is polymerized in the presence of a catalyst comprising:

Process for the polymerization or copolymerization of ethylene

A process for producing polyethylene comprises polymerizing ethylene or copolymerizing ethylene with other .alpha.-olefin in the presence of a catalyst system obtained by bringing the following components (I) to (III) in contact with one another:

Process for producing polyethylene

Polymerization of ethylene or copolymerization of ethylene with other .alpha.-olefin is carried out in the presence of a specific catalyst system. The catalyst system is obtained by preparing a reaction product (A) of an organic aluminum compound (I) represented by the formula AlR.sub.n.sup.1 X.sub.3-n where R.sup.1 is hydrogen or an alkyl group having from 1 to 10 carbon atoms, X is Cl or Br and n is a number satisfying 0&lt;n&lt;3, with a mixture of a straight chain aliphatic alcohol and a branched chain aliphatic alcohol or a cyclic alcohol, separately preparing a reaction product (B) of an organic magnesium compound with a hydropolysiloxane or a silicone compound in which organic groups and hydroxyl groups are bonded to silicon atoms, reacting the reaction product (A) with the reaction product (B) to produce a reaction product (C), reacting the reaction product (C) with a halogen-containing titanium or vanadium compound to obtain a solid product (D) and mixing the solid product (D) with an organic aluminum compound (II).

Ethylene or a mixture of ethylene and a small amount of another .alpha.-olefin or diene is polymerized in two successive steps under different hydrogen partial pressures by polymerizing 30 to 70 wt. % of the ethylene or ethylene mixture to be polymerized in the presence of hydrogen at a molar ratio of ethylene or ethylene mixture to hydrogen of 1:1-8 in the first step and polymerizing the residual ethylene or the ethylene mixture at a molar ratio of ethylene to hydrogen of 1:0-0.3 in the second step, in the presence of the specific catalyst system comprising an organoaluminum compound (C) and a specific solid catalytic component (B) obtained by reacting a titanium or vanadium halogen-containing compound with a reaction product (A) obtained by reacting a Grignard reagent with a hydropoly-siloxane having the formula ##EQU1## (R.sup.1 represents an alkyl, aryl, aralkyl, alkoxy, or aryloxy group as a monovalent organic group; a is 0,1 or 2; b is 1, 2 or 3; and a+b.ltoreq.3) or a silicon compound containing an organic group and hydroxyl group in the presence or absence of an aluminum-alkoxide, aluminum alkoxy-halide halide or a reaction product obtained by reacting the aluminum compound with water.

Two step process for polymerizing ethylene

A polyethylene is produced by polymerizing ethylene with or without a comonomer in the presence of a catalyst consisting of an organometallic compound and a solid catalytic component (B) obtained by reacting a titanium or vanadium halide with a reaction product (A) in the presence of one or more aluminum alkoxide having the formula

Process for producing polyethylenes

A polysulfone composition comprises 1 to 20 wt. % of polyphosphonate having the formula ##STR1## WHEREIN X represents Br or Cl; Y represents a C.sub.1-8 alkylidene group or sulfone group; a and bare respectively integers of 1 to 4 and n is an integer of 2 to 100.

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Ichihara, Japan

Takeshi Iwabuchi