Mitsui Chemicals, Inc.

Japan Oxygen, Co., Ltd.

Tooru Tanaka

Tatsuya Nakamura

Toshiyuki Tsutsui

Norio Kashiwa

Keiji Okada

Tetsunori Shinozaki

Tomoaki Matsugi

Shinichi Kojoh

Atsushi Shibahara

Munehito Funaya

Nobuo Kawahara

Tetsuhiro Matsumoto

Toshiyuki Hirose

Shingo Matsuo

Atsushi Morita

Kouichi Kizu

Hideyuki Kaneko

Naritoshi Hirota

Yoshiaki Konagaya

Youhei Houtani

Nobuhisa Mikawa

Kazuaki Yasuda

Masami Takaine

Toshihiro Tsubouchi

The present invention provides a process for producing an &#x3b1;-olefin polymer comprising polymerizing or copolymerizing (a) Cor higher &#x3b1;-olefin (s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.

Solid titanium catalyst component, olefin polymerization catalyst, and process for producing olefin polymer

The present invention provides a process for producing an &#x3b1;-olefin polymer comprising polymerizing or copolymerizing (a) Cor higher &#x3b1;-olefin(s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.

Disclosed is a poly(4-methyl-1-pentene) resin composition having an excellent balance between micropore formability and toughness, which can sufficiently form fine pores by drawing and does not cause a break during drawing. The poly(4-methyl-1-pentene) resin composition contains 0-90 parts by mass of a 4-methyl-1-pentene homopolymer (A) and 10-100 parts by mass of a 4-methyl-1-pentene copolymer (B) having a structural unit derived from 4-methyl-1-pentene and a structural unit derived from a C&#x3b1;-olefin other than 4-methyl-1-pentene. The content of the structural unit derived from a C&#x3b1;-olefin other than 4-methyl-1-pentene is 0.1-2.1% by mass relative to the total amount of the homopolymer (A) and the copolymer (B). The poly(4-methyl-1-pentene) resin composition also contains 0.1-800 ppm of a nucleator (C) relative to the total weight of the homopolymer (A) and the copolymer (B).

Poly(4-methyl-1-pentene) resin composition, film containing same, microporous film, battery separator and lithium ion battery

The present invention provides a 4-methyl-1-pentene polymer having excellent balance between heat resistance and rigidity, a process for producing the polymer, and a film and a LED mold formed from the polymer. The 4-methyl-1-pentene polymer comprises 50 to 100% by mass of a constituting unit derived from 4-methyl-1-pentene and 0 to 50% by mass of a constituting unit derived from at least one of olefins having 2 to 20 carbon atoms excluding 4-methyl-1-pentene, wherein the 4-methyl-1-pentene polymer is obtainable by continuously feeding a monomer forming the 4-methyl-1-pentene polymer and an organic solvent to a polymerization reactor and continuously extracting a polymerization reaction mixture containing the resulting 4-methyl-1-pentene polymer from the polymerization reactor.

4-methyl-1-pentene polymer, process for producing the same and use thereof

A novel olefin-based polymer has excellent thermal resistance, as well as excellent balance among various properties. The olefin-based polymer is an olefin-based polymer comprising 50 to 100% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties: i) the diad isotacticity is 70% or greater, ii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5, and iii) the intrinsic viscosity [&#x3b7;] is 0.5 (dl/g) or greater.

Olefin-based polymers and uses thereof

The present invention relates to a process for treating combustible exhaust gases containing poisonous and combustible component gases such as silane and so on, and a combustion system therefor. In the combustion system, the combustible exhaust gases are burnt by downward flames generated from a coaxial, fourfold-pipe burner wherein the flow rates of primary and secondary air are regulated, thereby preventing fine particles of oxides such as silicon dioxide resulting from the combustion of silane, etc. from being deposited onto the nozzle of said burner and allowing deposites, if any, to peel off immediately. Thus, there is no fluctuation in the pressure of the a combustible exhaust gas path, so that constantly stable and continuous combustion is achieved with no difficulty. Removal of dust contained in the exhaust gases comprising fine particles of silicon dioxide, etc. is effected by adding water to the combustion gases and passing the resulting liquid through an orifice on the outlet side of which a pressure equal to or lower than the atmospheric pressure is maintained under a pressure difference across which is at least 2,500 mmAq, thereby trapping the dust in water.

Process for treating combustible exhaust gases containing silane and the

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Yokohama, Japan

Tooru Tanaka