Mitsui Chemicals, Inc.

A School Corporation Kansai University

Takayuki Onogi

Junichi Imuta

Shoji Hiraoka

Koji Nakamachi

Satoru Miyazoe

Hideshi Hori

Fujito Ehara

Kazuo Toyota

Michio Tsugawa

Takeshi Ohmatsuzawa

Kenzaburou Fukutani

Seiji Noda

Masayuki Sakai

Akiyoshi Shimizu

Takeshi Karino

Yasunori Yoshida

Masanobu Ajioka

Akira Uchiyama

Mitsunobu Yoshida

Yoshiro Tajitsu

Hosei Shinoda

Tomoaki Matsugi

Shinichi Kojoh

Kyoko Kobayashi

Kenichi Goto

Nobuo Kawahara

Naoto Matsukawa

Shingo Matsuo

Yasushi Nakayama

Ichiro Fujio

Shinichi Usugi

Hideyuki Kaneko

Takeshi Kashima

Fumio Kageyama

Takeharu Isaki

Yuichi Itou

Masahiro Enna

Fumiaki Nishino

Yuichi Matsuda

Susumu Murata

Yoshiaki Aso

Takaharu Isaki

Akivoshi Shimizu

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

The invention provides a piezoelectric polymer material including a helical chiral polymer having a weight average molecular weight of from 50,000 to 1,000,000 and having optical activity, the piezoelectric polymer material having a piezoelectric constant dat 25&#xb0; C. of 10 pC/N or more, a degree of crystallinity obtained by X-ray diffraction of from 40% to 80%, and a haze of from 0.5 to 30.

Piezoelectric polymer material, process for producing same, and piezoelectric element

A modified polyolefin resin comprising a copolymer having a structure that a propylene-based polyolefin segment (a) and a segment (b) containing a lactic acid as a constituent are bonded in a block state and/or a graft state through a vinyl monomer having a hydroxyl group, wherein a number average molecular weight of the propylene-based polyolefin segment (a) is from 1,000 to 100,000, a number average molecular weight of the segment (b) containing lactic acid as a constituent is from 1,000 to 200,000, and a weight composition of the propylene-based polyolefin segment (a) and the segment (b) containing lactic acid as a constituent is from 10/90 to 90/10. The modified polyolefin resin can be used in a resin composition containing an aliphatic polyester resin (A), a polyolefin resin (B) and the modified polyolefin resin (C). The composition can exhibit excellent heat resistance and impact resistance and can be used for molding various parts.

Aliphatic polyester resin composition containing copolymer

The present invention provides a catalyst for polyester production capable of producing a polyester with high catalytic activity, a process for producing a polyester using the catalyst and a polyester produced thereby. The catalyst comprises a solid titanium compound obtained by dehydro-drying a hydrolyzate obtained by hydrolysis of a titanium halide and which has a molar ratio (OH/Ti) of a hydroxyl group (OH) to titanium (Ti) exceeding 0.09 and less than 4. In the process, the polyester is obtained by polycondensing an aromatic dicarboxylic acid, or an ester-forming derivative thereof, and an aliphatic diol, or ester-forming derivative thereof, in the presence of the catalyst. The resulting polyester has excellent transparency and tint, a titanium content of 1 to 100 ppm, a magnesium content of 1 to 200 ppm and a magnesium to titanium weight ratio of not less than 0.01.

Catalyst for polyester production, process for producing polyester using the catalyst, polyester obtained by the process, and uses of the polyester

Thermoplastic olefin elastomer composition

The present invention provides a catalyst for polyester production capable of producing a polyester with high catalytic activity and a process for producing a polyester using the catalyst. The catalyst for polyester production comprises a solid titanium compound which is obtained by dehydro-drying a hydrolyzate obtained by hydrolysis of a titanium halide and which has a molar ratio (OH/Ti) of a hydroxyl group (OH) to titanium (Ti) exceeding 0.09 and less than 4. The present invention also provides a method to obtain a polyester having a small increase of the acetaldehyde content during the molding. This method comprises bringing a polyester, which is obtained by the use of a titanium compound catalyst and in which the reaction has been completed, into contact with a phosphoric ester aqueous solution or the like having a concentration of not less than 10 ppm in terms of phosphorus atom. The present invention further provides a polyester having excellent transparency and tint and molded products of the polyester such as a blow molded article, a film, a sheet and a fiber. The polyester is obtained by polycondensing an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol or an ester-forming derivative thereof in the presence of a catalyst for polyester production which comprises a polycondensation catalyst component comprising a solid titanium compound and a co-catalyst component comprising a magnesium compound. This polyester has a titanium content of 1 to 100 ppm, a magnesium content of 1 to 200 ppm and a weight ratio (Mg/Ti) of magnesium to titanium of not less than 0.01.

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Chiba, Japan

Takayuki Onogi