Patents by Inventor Mitsuji Miyoshi
Mitsuji Miyoshi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 4525552Abstract: A process for the homopolymerization or copolymerization of olefins is disclosed, which is carried out in the presence of a catalyst system comprising the combination of at least one organometallic compound with a transition metal compound supported on a solid carrier, said solid carrier being obtained by the reaction of (a) a magnesium halide, (b) a compound represented by the formula: Al(OR).sub.n X.sub.3-n, where R is a hydrocarbon residual group having 1 to 24 carbon atoms, X is a hydrogen atom, and n is 0<n.ltoreq.3, and (c) a compound represented by the formula: Si(OR').sub.m X.sub.4-m, where R' is a hydrocarbon residual group having 1 to 20 carbon atoms, X is a halogen atom, and m is 0.ltoreq.m.ltoreq.4. The resulting polymers are characterized by a large bulk density and a narrow range of molecular weight distribution.Type: GrantFiled: February 8, 1984Date of Patent: June 25, 1985Assignee: Nippon Oil Co., Ltd.Inventors: Nobuyuki Kuroda, Toru Nakamura, Yutaka Shikatani, Kazuo Matsuura, Mitsuji Miyoshi
-
Patent number: 4507448Abstract: A process for the homopolymerization or copolymerization of olefins is disclosed, which is carried out in the presence of a catalyst system comprising the combination of at least one organometallic compound with a component resulting from the reaction of (a) a magnesium halide, (b) a compound represented by the formula, Al(OR).sub.n X.sub.3-n, where R is a hydrocarbon residual group having 1 to 20 carbon atoms, X is a hydrogen atom, and n is 0.ltoreq.n.ltoreq.3, (c) a compound represented by the formula, Si(OR').sub.m X.sub.4-m, where R' is a hydrocarbon residual group having 1 to 20 carbon atoms, X is a halogen atom, and m is 0.ltoreq.m.ltoreq.4, and (d) a titanium compound and/or a vanadium compound. The resulting polymers have a large bulk density and a narrow range of molecular weight distribution.Type: GrantFiled: May 4, 1982Date of Patent: March 26, 1985Assignee: Nippon Oil Co., Ltd.Inventors: Nobuyuki Kuroda, Toru Nakamura, Yutaka Shikatani, Kazuo Matsuura, Mitsuji Miyoshi
-
Patent number: 4384088Abstract: According to this invention, there is provided a process for preparing polyolefins wherein olefins are polymerized or copolymerized using as catalyst a solid component and an organometallic compound, characterized in that said solid component is a substance obtained by the copulverization of:(1) a reaction product resulting from a heat reaction of magnesium oxide and aluminum trichloride,(2) a titanium compound and/or a vanadium compound, and(3) if desired, an organic halide.Type: GrantFiled: June 7, 1978Date of Patent: May 17, 1983Assignee: Nippon Oil Company, LimitedInventors: Mitsuo Matsuno, Etsuo Kawamata, Nobuyuki Kuroda, Kazuo Matsuura, Mitsuji Miyoshi
-
Patent number: 4324876Abstract: A process for the homopolymerization or copolymerization of olefins is disclosed. The process is carried out in the presence of a catalyst system comprising the combination of an organometallic compound with a component resulting from the mutual contact of (i) an inorganic magnesium compound of a spherical shape having an average particle size of from 1 to 100 microns; (ii) a compound represented by the formula AlX.sub.3.OR'R" (where X represents a halogen atom, and R' and R" represent a hydrocarbon residual group having 1 to 20 carbon atoms; and (iii) a titanium compound represented by the formula Ti(OR).sub.4 (where R represents a hydrocarbon residual group having 1 to 20 carbon atoms). The resulting polymers are provided with a spherical particle shape.Type: GrantFiled: November 24, 1980Date of Patent: April 13, 1982Assignee: Nippon Oil Co., Ltd.Inventors: Kazuo Matsuura, Takeichi Shiraishi, Etsuo Kawamata, Nobuyuki Kuroda, Mitsuji Miyoshi
-
Patent number: 4288579Abstract: According to this invention there is provided a process for polymerizing or copolymerizing olefins using a catalyst consisting of:[A]a solid component obtained by contacting(1) a reaction product resulting from heat reaction of a magnesium oxide and an aluminum trihalide with(2) a titanium halide and/or an addition product of a titanium halide and an aromatic carboxylic acid ester, and[B]an organometallic compound and/or an addition product of an organometallic compound and an aromatic carboxylic acid ester,or alternatively, using a catalyst consisting of acid components [A] and [B] plus [C] an aromatic carboxylic acid ester.Type: GrantFiled: December 12, 1979Date of Patent: September 8, 1981Assignee: Nippon Oil Company, LimitedInventors: Mitsuji Miyoshi, Yoshio Tajima, Kazuo Matsuura, Nobuyuki Kuroda, Mitsuo Matsuno
-
Patent number: 4202953Abstract: A process for the production of polyolefins using an improved catalyst which exhibits enhanced activity in the polymerization or copolymerization of olefins such that the yields of the polymers or copolymers are increased with a minimum catalyst residue remaining. The catalyst is produced by reacting a magnesium dihalide anhydride with an aluminum alkoxy compound to produce a carrier on which a titanium compound and/or a vanadium compound is applied. The molar ratio of magnesium dihalide to aluminum compound ranges between 1:0.001 to 1:20, and most effectively is in the range of 1:0.05 to 1:5.Type: GrantFiled: January 25, 1979Date of Patent: May 13, 1980Assignee: Nippon Oil Co., Ltd.Inventors: Kazuo Matsuura, Nobuyuki Kuroda, Takeichi Shiraishi, Mitsuji Miyoshi
-
Patent number: 4154915Abstract: An improved catalyst system is disclosed for use in the polymerization or copolymerization of olefins. The catalyst comprises a transition metal compound, an organometal compound and a composite carrier. This carrier is constituted by a SO.sub.3 treated alumina and a magnesium and/or a calcium compound. The polymerization or copolymerization of olefins such as ethylene, propylene and 1-butene is effected under conditions similar to those for reactions by means of Ziegler catalysts, but the resulting polyolefins have a wider molecular weight distribution, viz, a larger flow parameter as required for extrusion or blow molding.Type: GrantFiled: May 8, 1975Date of Patent: May 15, 1979Assignee: Nippon Oil Co., Ltd.Inventors: Kazuo Matsuura, Masaomi Matsuzaki, Toru Nakamura, Nobuyuki Kuroda, Mitsuji Miyoshi
-
Patent number: 4083802Abstract: A process for the production of polyolefins is disclosed, which is carried out in the presence of catalysts prepared according to the invention. The catalysts comprise a carrier resulting from the reaction of anhydrous magnesium halide, silicon tetrachloride and a compound represented by the general formulaROHwhere R is a hydrocarbon group of 1 to 20 carbon atoms, and a transition metal compound supported on said carrier. Such catalysts are activated by an organometal compound of a metal of the Groups I to IV of the Periodic Table when in use.Type: GrantFiled: July 19, 1976Date of Patent: April 11, 1978Assignee: Nippon Oil Company LimitedInventors: Kazuo Matsuura, Nobuyuki Kuroda, Takeichi Shiraishi, Mitsuji Miyoshi
-
Patent number: 4006101Abstract: A process for the production of polyolefins is disclosed, which is carried out in the presence of catalysts prepared according to the invention. The catalysts comprise a carrier resulting from the reaction of anhydrous magnesium halide, silicon tetrachloride and an alcohol represented by the general formulaROHwhere R is an organic group of 1 to 20 carbon atoms, and a titanium and/or a vanadium compound supported on said carrier. Such catalysts are activated by an organoaluminum and/or an organozinc compound when in use.Type: GrantFiled: August 29, 1975Date of Patent: February 1, 1977Assignee: Nippon Oil Company Ltd.Inventors: Kazuo Matsuura, Nobuyuki Kuroda, Takeichi Shiraishi, Mitsuji Miyoshi