Mitsubishi Petrochemical Company Limited

Mitsubishi Chemical Corporation

Yoichi Maeda

Tadashi Takahashi

Junji Mayumi

Yukitaka Goto

Katsumi Hirakawa

Yoshihiko Sasaki

Nobuaki Sakurai

Naoko Kusaka

Masataka Souda

Satoshi Nishimura

An ethylene polymer which is useful for molding inflation film having a particularly excellent moldability is provided. The ethylene polymer is obtainable by the first and second steps and satisfying the following conditions (a) to (d):

Ethylene polymers

A process for producing an ethylene polymer comprising bringing ethylene or ethylene and an .alpha.-olefin having 3 to 10 carbon atoms into contact with a catalyst comprising the following components (A) and (B):

Process for producing ethylene polymers

A process for preparing an ethylene polymer which comprises polymerization of ethylene or ethylene and an .alpha.-olefin having 3 to 10 carbon atoms over a catalyst comprising the following components (A) and (B): (A) which is a solid component for a Ziegler catalyst obtained by bringing (2) into contact with (1) and bringing the contact product into contact with (3) and (4) wherein (1) is a solid catalyst component comprising (i)-(iii) where (i): MgX.sub.2, (ii): titanium tetraalkoxide and/or a polytitanate ester, (iii): a polymeric silicon compound, having a formula of ##STR1## R.sup.1 being a hydrocarbyl group, (2) is a halogenated Si compound; (3) is a halohydrocarbon; (4) is an organo-Al compound; and (B) is an organo-Al compound. An ethylene polymer having a moderately broad molecular weight distribution can be prepared in a high activity by use of the catalyst. The ethylene polymer is suited for the production of fibers or tapes.

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Yokkaichi, Japan

Yoichi Maeda