Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Prime Polymer Co., Ltd.

Yoshiho Sonobe

Akihiro Yamaguchi

Masahiro Ohta

Shoji Tamai

Hideaki Oikawa

Tetsunosuke Shiomura

Saburo Kawashima

Kazumi Mizutani

Masahiro Kouno

Hideki Bando

Makoto Mitani

Yasushi Nakayama

Norihide Inoue

Terunori Fujita

Kouji Ohkoshi

Yasuo Satoh

Toshiaki Suzuki

Junji Saito

Usaji Takaki

Tadahito Nobori

Shinji Kiyono

Nobuhiro Hirayama

Masao Suzuki

Daisuke Tanifuji

Norio Kashiwa

Tadashi Asanuma

Mamoru Takahashi

Yasushi Tohi

Shigekazu Matsui

Takashi Yukita

Shinichi Kojoh

Naoto Matsukawa

Tutomu Iwatani

Ryuichi Sugimoto

Yasuhiko Suzuki

Hideyuki Kaneko

Kenji Michiue

Yasuyuki Harada

Satoshi Fukushima

Ryuzi Haseyama

Chiaki Tomata

Masashiro Kouno

Yusuke Sekioka

Hideki Bandoh

According to the invention, a single or plural kinds of bridged metallocene compounds having differing cyclopentadienyl-derived groups afford macromonomers that are a source of long-chain branches and simultaneously catalyze the repolymerization of the macromonomers into olefin polymers having a large number of long-chain branches, small neck-in in the T-die extrusion, small take-up surge and superior mechanical strength. The olefin polymerization catalysts and the polymerization processes can efficiently produce the olefin polymers.

Bridged metallocene compound, olefin polymerization catalyst containing the same, and ethylene polymer obtained with the catalyst

Ethylene-based resin, which exhibits a satisfactorily high melt tension and can provide a molded object excellent in mechanical strength, the ethylene-based resin characterized in simultaneously satisfying the requirements [1] to [5] described below:

Ethylene-based resin and molded object obtained therefrom

Ethylene-based copolymer microparticles and functional group-containing ethylene-based copolymer microparticles that have particle diameter smaller than that of conventional polyethylene fine-particles, no inter-particle agglomeration, very narrow particle size distribution, and high sphericity are provided, in which requirements (A) to (E): (A) The intrinsic viscosity [&#x3b7;] measured in decalin at 135&#xb0; C. is in the range of 0.1 to 50 dl/g, (B) at least 95 wt % or more of particles pass through a mesh screen with an opening of 37 &#x3bc;m, (C) the median diameter (d) measured by laser diffraction scattering is 3 &#x3bc;m&#x2266;d&#x2266;25 &#x3bc;m, (D) the circularity coefficient is 0.85 or more, and (E) the variation coefficient of particle diameter (Cv) is 20% or less. Non-agglomerated spherical magnesium-containing microparticles used as magnesium-containing carrier component for olefin-polymerization catalysts that can manufacture the above microparticles are also provided.

Ethylene-based polymer microparticles, functional group-containing ethylene-based polymer microparticles, and catalyst carriers for manufacture thereof

Solid fine particles which contain a magnesium atom, an aluminum atom and a Calkoxy group simultaneously, are insoluble in a hydrocarbon solvent, and have an average particle diameter of 3 to 80 &#x3bc;m, and an olefin polymerization catalyst containing the solid fine particles and a transition metal compound in the groups 3 to 11 in the periodic table, exhibit a very high olefin polymerization activity without combination with an expensive organoaluminum oxy compound or organoboron compound and maintains a high activity in polymerization for a long time, and an olefin polymer excellent in powdery properties can be produced by using the olefin polymerization catalyst. The transition metal compound in the groups 3 to 11 in the periodic table includes a transition metal compound having a ligand containing two or more atoms selected from a boron atom, a nitrogen atom, an oxygen atom, a phosphorus atom and a sulfur atom.

Magnesium-containing carrier component and application to olefin polymerization

Magnesium-containing carrier components and application thereof to olefin polymerization

An ethylene-based polymer which is an ethylene/C4 to C10 &#x3b1;-olefin copolymer and satisfies the following requirements [k1] to [k3]: [k1] melt flow rate (MFR) under a loading of 2.16 kg at 190&#xb0; C. is in the range of 1.0 to 50 g/10 minutes; [k2] LNR defined as a scale of neck-in upon film molding is in the range of 0.6 to 1.4; and [k3] take-up speed at break [DS (m/min)] at 160&#xb0; C. and melt flow rate (MFR) satisfy the following relationship (Eq-1): 12&#xd7;MFR&#x2266;DS&#x2266;165&#xd7;MFR(Eq-1), and a thermoplastic resin composition containing the ethylene-based polymer, provide a molded product, preferably a film, excellent in moldability and mechanical strength. The ethylene-based polymer can be efficiently obtained by polymerization in the presence of an olefin polymerization catalyst formed from a solid carrier, (A) a solid transition metal catalyst component obtained by contacting (a) a compound of a transition metal of the group 4 in the periodic table, containing at least one ligand having a cyclopentadienyl skeleton, (b) an organoaluminum oxy compound, (c) a multifunctional organic halide, and if necessary (d) an organoaluminum compound, and if necessary (B) organoaluminum compound.

Ethylened polymer and molded object obtained therefrom

A salt useful as an active species in an organic reaction and represented by the following chemical formula (1):wherein n stands for an integer of from 1 to 8, Zrepresents an n-valent anion of an active hydrogen compound, a, b, c and d each stands for a positive integer, and Rs represent the same or different hydrocarbon groups. In addition, a simple and efficient process is provided for producing a poly(alkylene oxide) by polymerizing an alkylene oxide compound in the presence of the salt represented by the chemical formula (1).

Poly (alkylene oxide) prepared in the presence of a phosphazenium salt or compound

A novel olefin polymerization catalyst is provided which comprises (A) a transition metal compound or lanthanoid compound containing two or more atoms selected from the group consisting of boron, nitrogen, oxygen, phosphorus, sulfur, and selenium; and (B) a Lewis acid. A process for producing an olefin polymer is also provided. The catalyst has a high olefin polymerization activity without a combined use of an expensive organoaluminum oxy-compound or organoboron compound, and can maintain the high activity for a long polymerization time.

Olefin polymerization catalyst and process for producing olefin polymer with the catalyst

A salt useful as an active species in an organic reaction and represented by the following chemical formula (1): ##STR1## wherein n stands for an integer of from 1 to 8, Z.sup.n- represents an n-valent anion of an active hydrogen compound, a, b, c and d each stands for a positive integer, and Rs represent the same or different hydrocarbon groups. In addition, a simple and efficient process is provided for producing a poly(alkylene oxide) by polymerizing an alkylene oxide compound in the presence of the salt represented by the chemical formula (1).

Phosphazenium salt and preparation process thereof, and process for

Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or absence of an organoaluminum compound. A hydrogen partial pressure of a gas phase in the reaction vessel, said gas phase being formed of the propylene and hydrogen, is maintained at 10% or higher. The solid catalyst is formed of a transition metal compound or a reaction product between the transition metal compound and an organometallic compound, an aluminoxane and a fine particulate carrier. Also described herein is a heating-roll fixing type toner composition composed essentially of a binder resin or a binder resin composition, a colorant and, as a releasing agent, the wax.

Syndiotactic polypropylene wax, production process thereof, and heating

A novel transition metal compound represented by the formula ##STR1## (wherein each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A.sup.5 is a hydrocarbondiylidene group having 4 to 30 carbon atoms; a pair of A.sup.1 and A.sup.2 as well as a pair of A.sup.3 and A.sup.4 is respectively bonded to the identical carbon atom in A.sup.5 to form a crosslinking structure; each of R.sup.1 and R.sup.2 is a halogen atom, a hydrogen atom, an alkyl group or a silicon-containing alkyl group having 1 to 10 carbon atoms, an aryl group, an alkylaryl group, an arylalkyl group or a halogenated aryl group having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 may be identical or different; each of M.sup.1 and M.sup.2 is titanium, zirconium or hafnium; and M.sup.1 and M.sup.2 may be mutually identical or different), and a method for polymerizing an olefin in the presence of this compound and a co-catalyst. The employment of the combination of the above-mentioned compound and another known transition metal compound as the transition metal compounds permits preparing a polyolefin having a wide molecular weight distribution.

Method of polymerizing an olefin using a novel transition metal compound

Transition metal compound having two transition metal atoms in one

Polyimide having repeating units of the following formula (I) and its polyamic acid precursor having repeating units of the following formula (II) are disclosed; ##STR1## (where Y is a radical selected from the group consisting of a bond, divalent hydrocarbon having 1 to 10 carbons, hexafluorinated isopropylidene, carbonyl, thio, sulfinyl, sulfonyl and oxide, and R is a tetra-valent radical selected from the group consisting of aliphatic radical having 2 and more carbons, cyclo-aliphatic radical, monoaromatic radical, condensed polyaromatic radical, and non-condensed polyaromatic radical wherein aromatic radicals are mutually connected with a bond or a crosslinking function). Typical examples of polyimide and polyamic acid include where Y is thio radical and R is ##STR2## Y is a bond and R is III or IV, and Y is isopropylidene radical and R is IV. The polymers can be prepared from corresponding diamine and tetracarboxylic acid dianhydride. Polyimide or polyamic acid of this invention is excellent for high-temperature adhesive.

Polyimide and high-temperature adhesive of polyimide

Propylene copolymer

Growing community of inventors

Yokohama, Japan

Yoshiho Sonobe