Patents by Inventor Yoshiho Sonobe
Yoshiho Sonobe 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).
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Patent number: 5658999Abstract: 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.Type: GrantFiled: October 16, 1995Date of Patent: August 19, 1997Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Norihide Inoue, Masahiro Kouno, Yoshiho Sonobe, Kazumi Mizutani, Tetsunosuke Shiomura, Nobuhiro Hirayama
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Patent number: 5439994Abstract: 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.Type: GrantFiled: July 20, 1994Date of Patent: August 8, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Norihide Inoue, Tetsunosuke Shiomura, Masahiro Kouno, Yoshiho Sonobe, Kazumi Mizutani
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Patent number: 5359102Abstract: A 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.Type: GrantFiled: October 8, 1992Date of Patent: October 25, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Norihide Inoue, Tetsunosuke Shiomura, Masahiro Kouno, Yoshiho Sonobe, Kazumi Mizutani
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Patent number: 5278276Abstract: 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.Type: GrantFiled: January 26, 1993Date of Patent: January 11, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Masahiro Ohta, Saburo Kawashima, Yoshiho Sonobe, Shoji Tamai, Hideaki Oikawa, Kouji Ohkoshi, Akihiro Yamaguchi
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Patent number: 5219968Abstract: A substantially syndiotactic propylene copolymer which comprises propylene and at least one cyclic diolefin having 6 to 25 carbon atoms or an alkadiene having 6 to 25 carbon atoms and at least one terminal double bond, in the .sup.13 C-NMR spectrum of the copolymer measured in a 1,2,4-trichlorobenzene solution, a peak intensity observed at about 20.2 ppm as the reference of tetramethylsilane at 0.0 ppm being 0.5 or more of the total peak intensity attributed to methyl groups of propylene; the content of the cyclic diolefin or the alkadiene being from 0.01 to 20 mol %; the intrinsic viscosity [.eta.] of the copolymer measured in a tetralin solution at 135.degree. C. being from 0.1 to 10 dl/g.This copolymer can contain an .alpha.-olefin other than propylene, particularly ethylene.Type: GrantFiled: November 12, 1991Date of Patent: June 15, 1993Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tetsunosuke Shiomura, Tadashi Asanuma, Masashiro Kouno, Norihide Inoue, Satoshi Fukushima, Yoshiho Sonobe, Kazumi Mizutani, Tutomu Iwatani, Ryuichi Sugimoto
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Patent number: 5205894Abstract: 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.Type: GrantFiled: June 17, 1991Date of Patent: April 27, 1993Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Masahiro Ohta, Saburo Kawashima, Yoshiho Sonobe, Shoji Tamai, Hideaki Oikawa, Kouji Ohkoshi, Akihiro Yamaguchi
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Patent number: 5087689Abstract: 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 noncondensed 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.Type: GrantFiled: November 9, 1990Date of Patent: February 11, 1992Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Masahiro Ohta, Saburo Kawashima, Yoshiho Sonobe, Shoji Tamai, Hideaki Oikawa, Kouji Ohkoshi, Akihiro Yamaguchi
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Patent number: 4959440Abstract: This invention relates to a novel polyimide and describes method of its preparation, adhesives of the polyimide and the method for their application.The polyimide has recurring units of the formula ##STR1## (where the positions of two carbonyl radicals in a benzene ring are meta or para, and R is a tetra-valent radical selected from the group consisting of aliphatic radical having not less than two 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).The polyimide can be prepared by reacting diamine with tetracarboxylic dianhydride in organic solvents and imidizing resultant polyamic acid.The diamine in use is ether diamine and includes 1,3-bis[4-(3-aminophenoxy)benzoyl]benzene and 1,4-bis[4-(3-aminophenoxy)benzoyl]benzene.Type: GrantFiled: January 23, 1987Date of Patent: September 25, 1990Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Shoji Tamai, Saburo Kawashima, Yoshiho Sonobe, Masahiro Ohta, Hideaki Oikawa, Akihiro Yamaguchi
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Patent number: 4937339Abstract: In a process for preparing isocyanurate ring-containing materials useful in the production of lacquers and foams which comprises trimerizing an organic isocyanate compound in the presence of a catalyst, the use of potassium fluoride as the catalyst makes it possible to yield the desired product rapidly without formation of by-products. More preferably, the reaction efficiency can further be enhanced by using a polyethylene oxide compound, a quaternary ammonium salt and/or a phosphonium compound in combination with potassium fluoride.Type: GrantFiled: December 16, 1988Date of Patent: June 26, 1990Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Tetsunosuke Shiomura, Yoshiho Sonobe, Akihiro Yamaguchi, Ryuzi Haseyama
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Patent number: 4865795Abstract: In a process for producing thermosetting resins by the polymerization reaction of a cyclic carbonate with a polyvalent isocyanate compound, potassium fluoride is used as the catalyst. If desired, a co-catalyst selected from the group consisting of polyethylene oxides, cryptands and quaternary onium salts is additionally used. The thermosetting resins so produced have excellent impact stength and, therefore, are useful as molded materials and various substrates.Type: GrantFiled: June 13, 1988Date of Patent: September 12, 1989Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Tetsunosuke Shiomura, Yoshiho Sonobe, Akihiro Yamaguchi
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Patent number: 4847349Abstract: 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 radial 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 noncondensed polyaromatic radical wherein aromatic radicals ae 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, andy is isopropylidene radical and R is IV.The polymers can be prepared from corresponding diamine and tetracarboxylic acid dianhydride.Type: GrantFiled: June 3, 1987Date of Patent: July 11, 1989Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Masahiro Ohta, Saburo Kawashima, Yoshiho Sonobe, Shoji Tamai, Hideaki Oikawa, Kouji Ohkoshi, Akihiro Yamaguchi
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Patent number: 4797466Abstract: This invention relates to a novel polyimide and describes method of its preparation, adhesives of the polyimide and the method for their application.The polyimide has recurring units of the formula ##STR1## (where R is a tetra-valent radical selected from the group consisting of aliphatic radical having not less than two 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).The polyimide can be prepared by reacting 2,6-bis(3-aminophenoxy)pyridine with tetracarboxylic dianhydride in an organic solvent and imidizing resultant polyamic acid.Various tetracarboxylic dianhydrides can be used and particularly prefered are pyromellitic dianhydride and 3,3',4,4'-benzophenonetetracarboxylic dianhydride.Type: GrantFiled: February 6, 1987Date of Patent: January 10, 1989Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Hideaki Oikawa, Masahiro Ohta, Saburo Kawashima, Shoji Tamai, Yoshiho Sonobe, Akihiro Yamaguchi
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Patent number: 4734482Abstract: This invention relates to a novel polyimide and describes the method of its preparation, adhesives of the polyimide and the method for their application.The polyimide has recurring units of the formula ##STR1## (where Y is ##STR2## and R is a tetra-valent radical selected from the group consisting of aliphatic radicals having not less than two 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).Type: GrantFiled: December 23, 1986Date of Patent: March 29, 1988Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Shoji Tamai, Saburo Kawashima, Yoshiho Sonobe, Masahiro Ohta, Hideaki Oikawa, Akihiro Yamaguchi