Mitsui Chemicals, Inc.

Yasuo Funabara

Toshiyuki Tsutsui

Mamoru Takahashi

Yasushi Tohi

Masahiko Okamoto

Shiro Otsuzuki

Tetsuji Kasai

Tsuneo Yashiki

Takahiro Akashi

Shinichi Nagano

An ethylene polymer containing 0.01 to 1.20 mol % of a constitutional unit derived from &#x3b1;-olefin having 6 to 10 carbon atoms, wherein with respect to cross fractionation chromatography (CFC), either (1) the weight average molecular weight (Mw) of the components eluted at 73 to 76&#xb0; C. does not exceed 4,000, or (2) the ethylene polymer satisfies the following relationship (Eq-1), provides a molded product having excellent moldability and therefore excellent mechanical strength and appearance:&#x2266;0.1&#x2003;&#x2003;(Eq-1)wherein Sis the sum of the total peak areas related to the components eluted at 70 to 85&#xb0; C., and Sis the sum of the total peak areas related to the components eluted at 0 to 145&#xb0; C.

Ethylene polymer and application thereof to moldings

A process for preparing an ethylene polymer composition comprises a step (I) to prepare an ethylene (co)polymer (i) having &lsqb;&eegr;&rsqb; of at least 1.5 times the intrinsic viscosity of a (co)polymer (ii) and a step (II) to prepare an ethylene (co)polymer (ii) having &lsqb;&eegr;&rsqb; of 0.3 to 3 dl/g, said steps (I) and (II) using a catalyst containing a component obtained by contacting a liquid Mg compound with a liquid Ti compound in the presence of an organosilicon compound, wherein the step (II) is carried out in the presence of the polymer (i) or the step (I) is carried out in the presence of the polymer (ii), to prepare an ethylene polymer composition having &lsqb;&eegr;&rsqb; of 1 to 6 dl/g and a density of not less than 0.94 g/cm . According to the invention, an ethylene polymer composition (particles) having excellent particle morphology, scarcely suffering sintering and having excellent moldability, a process for efficiently preparing the particles of ethylene polymer composition, and a film having small gauge-variation and excellent tear strength can be provided.

Process for preparing ethylene polymer composition, particles of ethylene polymer composition, and film obtained from the particles of ethylene polymer composition

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Ichihara, Japan

Yasuo Funabara