Tosoh Corporation

Ioyo Soda Manufacturing Co., Ltd.

Morihiko Sato

Mitsuhiro Mori

Satoshi Hamura

Yozo Kondo

Akihiro Yano

Toru Yoshida

Daiji Hara

Masao Tanabiki

Toshiyuki Kaneko

Ryuji Ikeda

Hitoshi Ito

Satoru Yamada

Makoto Watanabe

Takashi Okada

Shigehiko Abe

Hisami Yasuda

Seiji Maehama

Toshikazu Chikusa

Kei Inatomi

Yasutake Wakabayashi

Kaname Ohashi

Keiji Sugihara

An object of the present invention relates to provide an ethylene polymer having excellent mechanical strength and excellent molding processability in a wide molding processing temperature range. The invention relates to use an ethylene polymer comprising a repeating unit derived from ethylene, or a repeating unit derived from ethylene and a repeating unit derived from a C&#x3b1;-olefin, the ethylene polymer being satisfied with the following (A) to (F). (A) Density (d (kg/m)) is from 910 to 970, (B) MFR (g/10 min)) is from 0.01 to 50, (C) terminal vinyl number is 0.2 or less per 1,000 carbon atoms, (D) melt strength (MS(mN)) measured at 160&#xb0; C. and MFR are satisfied with MS&#x3e;90&#x2212;130&#xd7;log(MFR), (E) melt strength (MS(mN)) measured at 190&#xb0; C. and MSare satisfied with MS/MS&#x3c;1.8, and (F) fluidized activation energy (E(kJ/mol)) and d are satisfied with 127&#x2212;0.107d&#x3c;E&#x3c;88&#x2212;0.060d.

Ethylene polymer, catalyst for ethylene polymer production, and method for producing ethylene polymer

A transition metal compound having a ligand with an azaferrocene structure or a ferrocene structure. The transition metal compound is used in combination with an activating cocatalyst, as a catalyst for polymerization of olefins.

Transition metal compound, coordinative compound, catalyst for polymerization of olefin, and process for polymerization of olefin using the catalyst

A polyolefin of a high molecular weight is produced by using a catalyst comprising a transition metal compound represented by General Formula (1):

Transition metal compound, olefin polymerization catalyst comprising the compound, and process for production of olefin polymer

A novel catalyst for polymerization of olefin is provided which comprises a modified clay compound (a) having an average particle diameter of less than 10 .mu.m, a transition metal compound (b), and an organoaluminum compound (c). This catalyst exhibits improved initial polymerization behavior, and produces an olefin polymer of less ash content at a high productivity.

Catalyst for olefin polymerization and process for production of olefin

A catalyst for polymerization of an olefin, which comprises (a) a transition metal compound of the following formula (1), (2) and/or (3): ##STR1## wherein each of M.sup.1, M.sup.2 and M.sup.3 is a titanium atom, a zirconium atom or a hafnium atom, each of Cp.sup.1, Cp.sup.2, Cp.sup.3, Cp.sup.4 and Cp.sup.5 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or a substitution product thereof, R.sup.1 is a hydrogen atom, a C.sub.1-20 hydrocarbon group or a C.sub.1-20 alkylsilyl group, each of X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5 and X.sup.6 is a hydrogen atom or a C.sub.1-20 hydrocarbon group, Z.sup.1 is a C.sub.1-20 hydrocarbon group, a silicon-containing C.sub.1-20 hydrocarbon group or a C.sub.1-20 alkylsilanediyl group, which serves to connect Cp.sup.3 and Cp.sup.4, Z.sup.2 is a C.sub.1-20 hydrocarbon group, a silicon-containing C.sub.1-20 hydrocarbon group or a C.sub.1-20 alkylsilanediyl group, which serves to connect Cp.sup.5 and J, J is an element of Group 15 or 16 of the Periodic Table, a is a coordination number of J, L is a Lewis base, and b is the number of the Lewis base L, provided 0.ltoreq.b.ltoreq.3, and (b) a modified clay obtained by treating clay or clay mineral with a compound containing an element of Group 15 or 16 of the Periodic Table.

Catalyst for polymerization of an olefin, and method for producing an

Analyst for polymerization of olefin is provided which comprises a clay mineral (a) having been modified with a compound (b) capable of introducing a cation into layer interspaces in the clay mineral; a metallocene compound (c); and an organoaluminum compound (d). This catalyst is inexpensive and yet has excellent activity for polymerization of olefin. The process for polymerization or copolymerization of olefins is also provided.

Olefin polymerization catalyst and olefin polymerization process

A catalyst for olefin polymerization obtainable by contacting:

Catalyst for olefin polymerization and process for producing olefin

A novel organic transition metal compound is disclosed, which is represented by the following formula (1): ##STR1## wherein the all symbols are defined in the disclosure. A polymerization catalyst comprising the organic transition metal compound and a process for the preparation of a polyolefin using the polymerization catalyst are also disclosed.

Organic transition metal compound and process for the preparation of

A novel class of olefin polymerization catalyst system based on specific organo-transition metal compounds and which are effective for controlling in particular the width and mode of the molecular weight distribution of the resulting polyolefins, and processes of olefin polymerization using the novel catalyst systems are disclosed.

Olefin polymerization catalyst based on organometallic complexes and

A method for producing a stereospecific polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which comprises (A) a solid catalyst component prepared by reacting a homogeneous solution containing (i) at least one member selected from the group consisting of metal magnesium and a hydroxylated organic compound, and oxygen-containing organic compounds of magnesium, (ii) an oxygen-containing organic compound of aluminum and (iii) an oxygen-containing organic compound of titanium, with (iv) at least one aluminum halide compound to obtain a solid product, and further reacting to this solid product, (v) an electron-donative compound and (vi) a titanium halide compound, (B) at least one member selected from the group consisting of organometallic compounds of Groups IA, IIA, IIB, IIIB and IVB of the Periodic Table, and (C) an oxygen-containing organic compound of silicon which has no aromatic substituent and which has at least one hydrocarbon group containing a secondary or tertiary carbon directly bonded to a silicon atom.

Method for producing a stereospecific polyolefin

A method for producing a stereospecific polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which comprises: (A) a solid catalyst component prepared by reacting (i) a homogeneous solution prepared by reacting (i-1) magnesium and a hydroxylated organic compound, (i-2) an oxygen-containing organic compound of titanium and/or (i-3) an oxygen-containing organic compound of silicon, with an oxygen-containing organic compound of aluminum and/or a boron compound, with (ii) at least one aluminum halide compound to obtain a solid product, reacting to this solid product (iii) an electron-donative compound and (iv) a titanium halide compound to obtain a solid component, and further reacting to this solid component (v) silicon tetrachloride and/or an alkyl-substituted product of silicon tetrachloride, (B) at least one member selected from the group consisting of organometallic compounds of Groups IA, IIA, IIB, IIIB and IVB of the Periodic Table, and (C) an electron-donative compound.

A method of producing a polyolefin, which comprises polymerizing at least one olefin in the presence of a catalyst system comprising

Method of producing polyolefin

A process for producing a polyolefin, which comprises polymerizing at least one olefin in the presence of a catalyst system comprising (A) a solid catalyst component (A) obtained by reacting to a uniform solution containing (i) at least one member selected from the group consisting of metallic magnesium and an organic hydroxide compound, and an oxygen-containing organic magnesium compound, and (ii) at least one oxygen containing organic titanium compound, (iii) at least one organic aluminum compound, (iv) at least one boron compound having an alkoxy group, and (v) at least one aluminum halide compound; and (B) at least one catalyst component (B) selected from the group consisting of organic metal compounds of metals of Groups Ia, IIa, IIb, IIIb and IVb of the Periodic Table.

Process for producing a polyolefin

Ethylene is polymerized, optionally with a small amount of an .alpha.-olefin, in the presence of a Ziegler catalyst in multiple stages by using a polymerization apparatus including at least three polymerization reactors. In the polymerization process, the following three ethylene polymer components U, H and L are prepared sequentially in an optional order; a component U having an .alpha.-olefin content .alpha..sub.U of 0.1-10 wt. % and an intrinsic viscosity [.eta.].sub.U satisfying 2.times.[.eta.].sub.W .ltoreq.[.eta.].sub.U .ltoreq.5.times.[.eta.].sub.W in which [.eta.].sub.W is the intrinsic viscosity of the entire ethylene polymer, the ratio R.sub.U of component U in the entire ethylene polymer satisfying 0.3.times.[.eta.].sub.W .ltoreq.[.eta.].sub.U .times.R.sub.U .ltoreq.0.8.times.[.eta.].sub.W ; a component H having an .alpha.-olefin content .alpha..sub.H of up to 20 wt. % and an intrinsic viscosity [.eta.].sub.H satisfying ([.eta.].sub.W).sup.1/2 .ltoreq.[.eta.].sub.H .ltoreq.1.5.times. [.eta.].sub.W, the ratio R.sub.H of the component H satisfying 0.25.times.[.eta.].sub.W .ltoreq.[.eta.].sub.H .times.R.sub.H .ltoreq.0.7.times.[.eta.].sub.W ; and an ethylene polymer component L having an .alpha.-olefin content .alpha..sub.L of up to 10 wt. % and an intrinsic viscosity [.eta.].sub.L satisfying 0.2.ltoreq.[.eta.].sub.L .ltoreq.2.0, the ratio R.sub.L of the component L satisfying [.eta.].sub.L .times.R.sub.L .ltoreq.0.05.times.[.eta.].sub.W. The ethylene polymer satisfies the requirement of .alpha..sub.U .times.R.sub.U .ltoreq.0.2.times.(.alpha..sub.U .times.R.sub.U +.alpha..sub.H .times.R.sub.H +.alpha..sub.L .times.R.sub.L), and has [.eta.].sub.W of 1.5 to 4.0. The catalyst used is such that, when the component H is prepared independently, the molecular weight distribution Mw/Mn of the obtained ethylene polymer is in the range of from 7 to 17 and the rate constant of deactivation Kd at said polymerization is larger than 0.3 hr.sup. -1.

Ethylene polymer and process for preparing same

A manufacturing method of polyolefin characterized in that at least one kind of olefins is allowed to polymerize in the presence of a catalyst system comprising

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Yokkaichi, Japan

Morihiko Sato