Patents by Inventor Masakatsu Nakatsuka
Masakatsu Nakatsuka 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: 8294144Abstract: In order to attain high mobility, large on/off current ratio and excellent storage stability to organic transistor comprising an organic semiconductor layer, the organic semiconductor layer comprises at least one compound represented by the general formula (1): (wherein each of X1 to X4 represents independently a hydrogen atom, a halogen atom, a straight, branched or cyclic alkyl group, a straight, branched or cyclic alkoxy group, a straight, branched or cyclic alkoxyalkyl group, or an unsubstituted or substituted aryl group, A represents an unsubstituted or substituted thiophene ring, B represents an unsubstituted or substituted benzene ring, or an unsubstituted or substituted thiophene ring).Type: GrantFiled: September 12, 2008Date of Patent: October 23, 2012Assignee: Yamamoto Chemicals, Inc.Inventors: Takahiro Fujiyama, Yoshiyuki Totani, Masakatsu Nakatsuka
-
Publication number: 20110012098Abstract: In order to attain high mobility, large on/off current ratio and excellent storage stability to organic transistor comprising an organic semiconductor layer, the organic semiconductor layer comprises at least one compound represented by the general formula (1).Type: ApplicationFiled: September 12, 2008Publication date: January 20, 2011Applicant: YAMAMOTO CHEMICALS, INC.Inventors: Takahiro Fujiyama, Yoshiyuki Totani, Masakatsu Nakatsuka
-
Patent number: 7166240Abstract: An electroluminescent element in which at least one layer containing at least one of novel hydrocarbon compounds with an anthracene ring and a fluorene ring directly bound is held between a pair of electrodes. The compounds can advantageously be used in a luminescent element and provide an organic electroluminescent element having an excellent luminescent efficiency and a long luminescent life.Type: GrantFiled: September 1, 2004Date of Patent: January 23, 2007Assignee: Mitsui Chemicals, Inc.Inventors: Tsutomu Ishida, Takehiko Shimamura, Yoshiyuki Totani, Masakatsu Nakatsuka
-
Patent number: 6929870Abstract: An electroluminescent element in which at least one layer containing at least one of novel hydrocarbon compounds with an anthracene ring and a fluorene ring directly bound is held between a pair of electrodes. The compounds can advantageously be used in a luminescent element and provide an organic electroluminescent element having an excellent luminescent efficiency and a long luminescent life.Type: GrantFiled: August 10, 2001Date of Patent: August 16, 2005Assignee: Mitsui Chemicals, Inc.Inventors: Tsutomu Ishida, Takehiko Shimamura, Yoshiyuki Totani, Masakatsu Nakatsuka
-
Publication number: 20050074631Abstract: An electroluminescent element in which at least one layer containing at least one of novel hydrocarbon compounds with an anthracene ring and a fluorene ring directly bound is held between a pair of electrodes. The compounds can advantageously be used in a luminescent element and provide an organic electroluminescent element having an excellent luminescent efficiency and a long luminescent life.Type: ApplicationFiled: September 1, 2004Publication date: April 7, 2005Applicant: Mitsui Chemicals, Inc.Inventors: Tsutomu Ishida, Takehiko Shimamura, Yoshiyuki Totani, Masakatsu Nakatsuka
-
Publication number: 20030087126Abstract: An electroluminescent element in which at least one layer containing at least one of novel hydrocarbon compounds with an anthracene ring and a fluorene ring directly bound is held between a pair of electrodes. The compounds can advantageously be used in a luminescent element and provide an organic electroluminescent element having an excellent luminescent efficiency and a long luminescent life.Type: ApplicationFiled: April 10, 2002Publication date: May 8, 2003Inventors: Tsutomu Ishida, Takehiko Shimamura, Yoshiyuki Totani, Masakatsu Nakatsuka
-
Patent number: 6383982Abstract: A color developer composition comprising (A) a color developer containing a polyvalent metal salt of a salicylic acid derivative, and (B) a polyester polyol having in the molecule skeleton at least one carbonate bond or ester bond, and a derivative thereof, an aqueous dispersion and a color developing ink using this color developer composition, and a recording sheet having a layer containing this color developer composition on a base material.Type: GrantFiled: May 2, 2000Date of Patent: May 7, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Jotaro Kida, Yoshimitsu Tanabe, Nobuhiro Takizawa, Masakatsu Nakatsuka
-
Patent number: 6217793Abstract: Provided are novel acetylene compounds which are useful as a component for a liquid crystal composition used for a liquid crystal element, a liquid crystal composition containing said compounds and a liquid crystal element using said liquid crystal composition. The acetylene compound is represented by Formula (1): n-CmH2m+1—C≡C—A—Z1—B—Y1—R1 (1) wherein m represents an integer of 2 to 24; R1 represents a linear or branched alkyl group, a linear or branched alkoxyalkyl group, a linear or branched alkenyl group, or a linear or branched alkenyloxyalkyl group each of which may be substituted with a halogen atom; R1 may have an asymmetric carbon atom, and the asymmetric carbon atom may be optically active; A and B represents a cyclic group such as a phenylene group, a biphenylene group, a naphthylene group and the like each of which may be substituted with a halogen atom.Type: GrantFiled: May 17, 1999Date of Patent: April 17, 2001Assignee: Mitsui Chemicals, Inc.Inventors: Yoshiyuki Totani, Hiroe Kayashima, Tsutomu Ishida, Masakatsu Nakatsuka
-
Patent number: 5861108Abstract: Provided is a naphthalene compound represented by the following Formula (1): ##STR1## wherein R.sub.1 and R.sub.2 each represent a linear or branched alkyl group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms which may be substituted with halogen atoms and have no asymmetric carbon atoms; A represents any of the groups represented by the following formulas: ##STR2## (wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 each represent a hydrogen atom or a halogen atom); and z represents 0 or 1. The addition of this naphthalene compound to a liquid crystal composition makes it possible to improve various characteristics such as the high speed response property of the liquid crystal composition and the temperature dependency of the response time. The above naphthalene compound is useful as a liquid crystal material for liquid crystal compositions, particularly ferroelectric liquid crystal compositions.Type: GrantFiled: July 1, 1996Date of Patent: January 19, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Tsutomu Ishida, Atsuo Otsuji, Yoshiyuki Totani, Motokazu Hirao, Hiroe Kayashima, Masakatsu Nakatsuka
-
Patent number: 5770108Abstract: A novel pyrimidine compound represented by the following Formulas (1) and (2), a liquid crystal composition containing said compound and a liquid crystal element having excellent characteristics such as high speed response, orientation and high contrast ratio. ##STR1## wherein R.sub.1 and R.sub.2 each represent a linear or branched alkyl or alkenyl group, an alkoxyl or alkenyloxy group; R.sub.3 and R.sub.4 each represent a linear or branched alkyl group or alkenyl group; A.sub.1 and A.sub.2 each represent a substituted or unsubstituted 1,4-phenylene group, a pyridine-2,5-diyl or trans-1,4-cyclohexylene group; X.sub.1 and X.sub.2 each represent a single bond, --COO--, --OCO--, --OCH.sub.2 or --CH.sub.2 O-- group; Y.sub.1 and Y.sub.2 each represent --COO-- or --OCO-- group; and a, b, p, q, m and n each represent 0 or 1, provided that a+b+p+q is not 0.Type: GrantFiled: June 21, 1996Date of Patent: June 23, 1998Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshiyuki Totani, Motokazu Hirao, Atsuo Otsuji, Tsutomu Ishida, Hiroe Kayashima, Masakatsu Nakatsuka
-
Patent number: 5647896Abstract: Provided are a color-developing agent comprising a multivalent metal salt of a salicylic acid derivative and a sulfonated phenol and/or a metal salt thereof and having excellent initial and ultimate color-developing capacities and improved waterproofness; and a color-developing sheet making use of the color-developing agent.Type: GrantFiled: October 30, 1995Date of Patent: July 15, 1997Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Takeshi Nishimura, Tomoko Kamashita, Masaru Wada, Teruyuki Nagata, Yoshimitsu Tanabe, Kiyoharu Hasegawa, Masakatsu Nakatsuka
-
Patent number: 5525686Abstract: A process for preparing a polyvalent metal salt of a salicylic acid resin which comprises the steps of reacting salicylic acid or its derivative with styrene or its derivative at a temperature of -20.degree. C. or higher but lower than 40.degree. C. in the presence of sulfuric acid, and then reacting the resulting reaction product with a polyvalent metal compound; an aqueous dispersion in which the polyvalent metal salt of the resin is dispersed in water; and a developing sheet in which the polyvalent metal salt of the salicylic acid resin is used.Type: GrantFiled: December 13, 1994Date of Patent: June 11, 1996Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshimitsu Tanabe, Jotaro Kida, Kiyoharu Hasegawa, Masakatsu Nakatsuka, Masayuki Furuya, Takeshi Nishimura
-
Patent number: 5476957Abstract: The heat-sensitive recording material disclosed comprises a colorless or pale colored dyestuff precursor, one or more salicylic acid derivative of the formula (1) or metal salt of the derivative and an aliphatic amide compound having 18.about.60 carbon atoms in molecular structure, and is excellent in thermal response and preservation stability of white portions and images. ##STR1## wherein X.sub.1 and X.sub.2 are a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aralkyl group or an aryl group, Y.sub.1 and Y.sub.2 are an oxygen atom or a sulfur atom, R.sub.1 is a hydrogen atom, an alkyl group, an aralkyl group or an aryl group, and R.sub.2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group.Type: GrantFiled: November 9, 1994Date of Patent: December 19, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshimitsu Tanabe, Yuki Kobayashi, Atsuo Otsuji, Masakatsu Nakatsuka, Akihiro Yamaguchi
-
Patent number: 5426170Abstract: 1. A method for preparing an aromatic polycarbonate having less content of a low molecular weight oligomer which comprises the steps of:(A) conducting an interfacial polymerization reaction in a reaction system comprising at least one aromatic dihydroxy compound, a carbonate precursor, an alkali metal or alkaline earth metal base, water and an organic solvent in the absence of an endcapping agent, and(B) conducting an interfacial polymerization reaction with the addition of an endcapping agent after at least one of the following parameters reaches a predetermined value:(1) a weight-average molecular weight of a prepolymer obtained in step A,(2) a residual amount of the aromatic dihydroxy compound which is contained in the reaction mixture obtained in step A,(3) an amount ratio of a bishaloformate compound to a prepolymer wherein the bishaloformate compound is a bishaloformate derivative of a dihydroxy compound and is contained in the reaction mixture obtained in step A.Type: GrantFiled: November 29, 1993Date of Patent: June 20, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Motokazu Hirao, Yoshiyuki Totani, Tomonori Ito, Masakatsu Nakatsuka, Akihiro Yamaguchi
-
Patent number: 5391806Abstract: Heat-sensitive recording materials contain an electron-donating chromogenic compound and an electron-attracting compound. The recording materials also contain at least one compound represented by the following formula: ##STR1## wherein R.sub.1 and R.sub.3 mean a hydrogen atom or an alkyl, aralkyl or aryl group, R.sub.2 and R.sub.4 denote an alkyl, alkenyl, aralkyl or aryl group, X.sub.1, X.sub.2, Y.sub.1 and Y.sub.2 stand for an oxygen or a sulfur atom, and --Z.sub.1 -- and --Z.sub.2 -- are a specific aromatic group. Also provided are phenol compounds represented by the following formula: ##STR2## wherein R.sub.1, R.sub.2, X.sub.1 and Y.sub.1 have the same meanings as defined above; R.sub.5 and R.sub.6 are a hydrogen or halogen atom or an alkyl, alkoxy, aralkyl, aryl or hydroxyl group; p and q stand for an integer of 1-4; R.sub.5 and R.sub.6 may be either the same or different when p and q represent an integer of 2 or greater; and --Z.sub.3 -- means a specific divalent group.Type: GrantFiled: October 5, 1993Date of Patent: February 21, 1995Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Atsuo Otsuji, Toshihiro Motoshima, Yoshimitsu Tanabe, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Masakatsu Nakatsuka, Akihiro Yamaguchi
-
Patent number: 5380814Abstract: A process for producing an aromatic polycarbonate by reacting an aromatic dihydroxy compound, an alkali or alkaline earth metal base and a carbonyl halide compound comprises feeding a polymerization catalyst as the carbonyl halide is fed to a mixture of the aromatic dihydroxy compound, the alkali metal or alkaline earth metal, water and an organic solvent. The molecular weight of the aromatic polycarbonate can be properly controlled, the rate of end capping is high, and coloration of the aromatic polycarbonate is less. Such aromatic polycarbonate can be produced while suppressing hydrolysis of the carbonyl halide compound and/or haloformate compound.Type: GrantFiled: June 8, 1993Date of Patent: January 10, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshiyuki Totani, Motokazu Hirao, Tomonori Ito, Masakatsu Nakatsuka, Akihiro Yamaguchi
-
Patent number: 5359117Abstract: A process for producing continuously an aromatic polycarbonate oligomer by reacting an aromatic dihydroxy compound and an alkali metal base or an alkaline earth metal base with a carbonyl halide compound comprises:(1) feeding continuously to a tank reactor an aromatic dihydroxy compound, water, a molecular weight controlling agent, a polymerization catalyst, a carbonyl halide compound, and an organic solvent, and an alkali metal base or an alkaline earth metal base in an amount of 1.15-1.6 equivalents based on the aromatic dihydroxy compound,(2) carrying out the reaction with a residence time as defined by the following formula,log Y<-2.19X+1.84 (0.0005.ltoreq.X<0.84,1.ltoreq.Y<69)where X is an amount of the polymerization catalyst in terms of mole % based on the amount of mole of the aromatic dihydroxy compound fed per unit time, and Y is a residence time (min.Type: GrantFiled: July 8, 1993Date of Patent: October 25, 1994Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshiyuki Totani, Motokazu Hirao, Tomonori Ito, Masakatsu Nakatsuka, Akihiro Yamaguchi, Ken-Ichi Goto, Takashi Kuroki, Yukiko Mori, Shoji Obuchi, Masahiro Ohta
-
Patent number: 5354513Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.Type: GrantFiled: October 13, 1993Date of Patent: October 11, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Katsuji Nakamura, Junichi Fujio, Shin Hosonuma, Masakatsu Nakatsuka, Tsutomu Nishizawa
-
Patent number: 5348685Abstract: This invention is directed to reduce the viscosity of a naphthalene type mixed liquid crystal and to improve display quality while maintaining a bookshelf layer structure. The ferroelectric liquid crystal composition of the present invention comprises 70 to 97 parts by weight of a naphthalene base mixed liquid crystal and 3 to 30 parts by weight of a predetermined tolan type liquid crystal.Type: GrantFiled: August 17, 1993Date of Patent: September 20, 1994Assignees: Fujitsu Limited, Mitsui Toatsu Chemicals, Inc., Sanyo Chemical Industries, Ltd.Inventors: Akihiro Mochizuki, Shigeo Kasahara, Tetsuya Makino, Masashi Watanabe, Masakatsu Nakatsuka, Kunikiyo Yoshio, Masahiro Satoh, Tetsuya Watanabe, Naoko Sugita, Tatsuroh Yanagi
-
Patent number: 5346878Abstract: The heat-sensitive recording material disclosed comprises a colorless or pale colored dyestuff precursor, one or more salicylic acid derivative of the formula (1) or metal salt of the derivative and an aliphatic amide compound having 18.about.60 carbon atoms in molecular structure, and is excellent in thermal response and preservation stability of white portions and images. ##STR1## wherein X.sub.1 and X.sub.2 are a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aralkyl group or an aryl group, Y.sub.1 and Y.sub.2 are an oxygen atom or a sulfur atom, R.sub.1 is a hydrogen atom, an alkyl group, an aralkyl group or an aryl group, and R.sub.2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group.Type: GrantFiled: August 18, 1993Date of Patent: September 13, 1994Assignees: Mitsui Toatsu Chemicals, Inc., Mitsubishi Paper Mills LimitedInventors: Masakatsu Nakatsuka, Naomasa Koike, Akinori Okada