Mitsui Chemicals, Inc.

Prime Polymer Co., Ltd.

Hideki Bando

Yoshiho Sonobe

Makoto Mitani

Yasushi Nakayama

Yasuo Satoh

Terunori Fujita

Masao Suzuki

Yasushi Tohi

Yasuyuki Harada

Daisuke Tanifuji

Junji Saito

Mamoru Takahashi

Ken Yoshitsugu

Takashi Yukita

Kenji Sugimura

Naoto Matsukawa

Naoshi Nagai

Kenji Michiue

Kazuoki Nakai

Shiro Nakatsuka

Takahiro Akashi

Tsutomu Tasaki

Yusuke Sekioka

Shinya Matsubara

Chiaki Tomata

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

The invention provides a method for preventing fouling in chemical equipment, comprising adding an antifouling agent which comprises a polyoxyalkylene polymer having Mn of 30,000 or less to a component in the chemical equipment.

Method for preventing fouling in chemical equipment and antifouling agent

The present invention provides a film including, in at least a part thereof, a layer comprising an ethylene-based resin, which is a copolymer of ethylene and an &#x3b1;-olefin of 4 to 10 carbon atoms, and satisfies the following requirements (1) to (5) at the same time or an ethylene-based resin composition containing the resin;

Film or laminate comprising ethylene-based resin or ethylene-based resin composition

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

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Ichihara, Japan

Hideki Bando