Mitsui Chemicals, Inc.

Fumiaki Nishino

Tatsuya Nakamura

Isao Hara

Atsushi Shibahara

Akiko Matsumoto

Kou Tsurugi

Kazumori Kawamura

Yasuyuki Harada

Shiori Hanada

Wataru Yamada

Toshihiro Muroto

Yasunori Yoshida

Kazuyuki Fukuda

Toshihiko Takaki

Naoto Matsukawa

Katsunori Nishiura

Yasushi Nakayama

Takayuki Onogi

Takeshi Karino

Susumu Murata

Takehiro Miyashita

Siori Hanada

An object of the invention is to provide a solid polyaluminoxane composition suitably used as a cocatalyst and a catalyst carrier in combination with an olefin oligomerization or polymerization catalyst, without the use of solid inorganic carriers such as silica. The solid polyaluminoxane composition of the invention includes a polyalkylaluminoxane and a trialkylaluminum, and has a solubility in n-hexane at 25&#xb0; C. of less than 0.50 mol % as measured by a specific method (i), a solubility in toluene at 25&#xb0; C. of less than 1.0 mol % as measured by a specific method (ii), and a 13 mol % or more molar fraction of alkyl groups derived from the trialkylaluminum moieties relative to the total number of moles of alkyl groups derived from the polyalkylaluminoxane moieties and the alkyl groups derived from the trialkylaluminum moieties as measured with respect to tetrahydrofuran-dsoluble components by a specific method (iii).

Solid polyaluminoxane composition, olefin polymerization catalyst, olefin polymer production method and solid polyaluminoxane composition production method

A method of production of ethylene-based polymer particles includes the steps of: homopolymerizing ethylene or copolymerizing ethylene and a linear or branched &#x3b1;-olefin having 3 to 20 carbon atoms in the presence of an olefin polymerization catalyst including: (A) fine particles having an average particle diameter greater than or equal to 1 nm and less than or equal to 300 nm obtained at least by the following two steps: (Step 1) causing contact between a metal halide and an alcohol in a hydrocarbon solvent; (Step 2) causing contact between a component obtained by (Step 1) and an organoaluminum compound and/or an organoaluminumoxy compound; and (B) a transition metal compound represented in General Formula (I) or (II), and (E) an intrinsic viscosity [&#x3b7;] of the ethylene-based polymer particles, measured in decalin at 135&#xb0; C., is from 5 to 50 dL/g.

Method of production of ethylene-based polymer particles and stretch-molded article obtained from ethylene-based polymer particles

Disclosed is a method for producing an optical film composed of a transparent resin and a metal oxide, which film has high light transmittance and light diffusion property even it is formed thin. Also disclosed is such an optical film. Specifically disclosed is a method for producing an optical film having a total light transmittance of not less than 70% and a haze value of not less than 20%, which comprises a step (A) wherein a metal compound to form a metal oxide through a sol-gel reaction is subjected to a sol-gel reaction in a solvent; a step (B) for providing a solution containing a transparent resin as a solute; a step (C) for mixing the mixture obtained in the step (A) with the solution obtained in the step (B); and a step (D) wherein the mixture obtained in the step (C) is applied or spread over a substrate or container and then heated for evaporating the solvent, thereby forming a film thereon.

Optical film and method for producing same

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Ichihara, Japan

Fumiaki Nishino