Patents Assigned to Kawamura Institute of Chemical Research
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Publication number: 20060148958Abstract: The polymer gel obtained from the method for incorporating hydroxyapatite in a polymer hydrogel by impregnating an aqueous phosphoric acid alkali metal salt solution and an aqueous carbonate solution alternately one or more times with a polymer gel consisting of a polymer of a water-soluble organic monomer and a water-swelling clay mineral, contains finely dispersed biocompatible substances, and the polymer gel excels in dynamic physical property and stability and can exhibit the performance of the biocompatible substance efficiently. The dried biocompatible substance-containing polymer gel is obtained by drying the above polymer gel.Type: ApplicationFiled: January 7, 2004Publication date: July 6, 2006Applicant: Kawamura Institute of Chemical ResearchInventors: Kazutoshi Haraguchi, Tooru Takehisa
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Patent number: 7049369Abstract: A styrene resin composition is provided which has a high molecular weight enabling a molded product obtained therefrom to have satisfactory strength, has a high melt mass-flow rate, high melt tension, and hence excellent moldability, and is less apt to gel during production, and a process for producing such a styrene resin composition. The styrene resin composition comprises a linear polystyrene having a weight average molecular weight of 200,000 to 350,000 and a multibranched polystyrene having a weight average molecular weight of 1,000,000 to 10,000,000, has an average molecular weight of 250,000 to 700,000, and a melt mass-flow rate (MFR) and melt tension (MT) which satisfy the following formulas (1) and (2) respectively: MFR?45×exp(?0.1×Mw×10?4)??(1) MT?0.07Mw×10?4+1.8.Type: GrantFiled: January 30, 2003Date of Patent: May 23, 2006Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Hiroyuki Yamazaki, Tsuyoshi Morita, Ren-Hua Jin
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Publication number: 20060078736Abstract: The three-dimensional periodic structure of the present invention comprises a matrix made of an inorganic oxides in which core-shell particles are disposed so as to contact with each other, the core-shell particles each comprising a core portion made of a fine particle and a shell portion made of a crosslinked hydrophilic organic polymer backbones, wherein the hydrophilic organic polymer backbones and the inorganic oxides hybridize into an organic/inorganic a composite.Type: ApplicationFiled: August 18, 2005Publication date: April 13, 2006Applicant: KAWAMURA INSTITUTE OF CHEMICAL RESEARCHInventors: Norimasa Fukazawa, Ren-Hua Jin
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Patent number: 6960644Abstract: A water-soluble block copolymer having a mass average molecular weight of 2500 to 800000 and comprising, within a molecule, a poly(ethylene imine) block unit and a poly(N-propionylethylene imine) block unit is a novel linear or star-shaped water-soluble block copolymer.Type: GrantFiled: September 15, 2003Date of Patent: November 1, 2005Assignee: Kawamura Institute of Chemical ResearchInventor: Ren-Hua Jin
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Publication number: 20050234179Abstract: A polymer composite and a stretched product thereof formed from a three dimensional network structure including an organic polymer (A), comprising either a polymer produced from a water soluble (meth)acrylate ester (a), or a copolymer of a water soluble (meth)acrylate ester (a) and at least one compound selected from a group consisting of (meth)acrylamide and N-substituted (meth)acrylamides (b), and a water swelling clay mineral (B).Type: ApplicationFiled: April 16, 2004Publication date: October 20, 2005Applicant: KAWAMURA INSTITUTE OF CHEMICAL RESEARCH.Inventors: Kazutoshi Haraguchi, Toru Takehisa, Makiko Ebato
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Patent number: 6943206Abstract: The present invention provides a novel organic/inorganic hybrid hydrogel which is superior in homogeneity, transparency, mechanical properties, and in swelling and shrinking properties, a manufacturing method therefor, and a dry body of the organic/inorganic hybrid hydrogel which is obtained by removing water from said hydrogel. The organic/inorganic hybrid hydrogel comprises a water soluble polymer (A), a water swelling clay mineral (B) which can be homogeneously dispersed in water, and water (C), and water (C) is included in a three-dimensional network formed by (A) and (B).Type: GrantFiled: November 17, 2003Date of Patent: September 13, 2005Assignee: Kawamura Institute of Chemical ResearchInventor: Kazutoshi Haraguchi
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Publication number: 20050008893Abstract: An organic electroluminescent device is provided which has a high degree of adhesion between an anode and a hole transport layer, the device emitting light of high luminance even when driven by low applied voltages. Copolymers useful in hole transport layers in organic electroluminescent devices are also provided. Methods of producing hole transport layers for organic electroluminescent devices which can emit light of high luminance even when driven by low applied voltages are also provided, the hole transport layers having high degrees of adhesion with anode. A copolymer comprises a monomer unit including in its structure an electron-donating N,N-diaryl-substituted amino group such as an N,N-diphenylaminophenyl group, or a group having an N,N-diaryl-substituted amino moiety, and a monomer unit having at least one functional group.Type: ApplicationFiled: July 10, 2003Publication date: January 13, 2005Applicant: KAWAMURA INSTITUTE OF CHEMICAL RESEARCHInventor: Shinji Kato
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Publication number: 20040106722Abstract: The present invention provides a novel organic/inorganic hybrid hydrogel which is superior in homogeneity, transparency, mechanical properties, and in swelling and shrinking properties, a manufacturing method therefor, and a dry body of the organic/inorganic hybrid hydrogel which is obtained by removing water from said hydrogel. The organic/inorganic hybrid hydrogel comprises a water soluble polymer (A), a water swelling clay mineral (B) which can be homogeneously dispersed in water, and water (C), and water (C) is included in a three-dimensional network formed by (A) and (B).Type: ApplicationFiled: November 17, 2003Publication date: June 3, 2004Applicant: Kawamura Institute of Chemical ResearchInventor: Kazutoshi Haraguchi
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Patent number: 6710104Abstract: The present invention provides a novel organic/inorganic hybrid hydrogel which is superior in homogeneity, transparency, mechanical properties, and in swelling and shrinking properties, a manufacturing method therefore, and a dry body of the organic/inorganic hybrid hydrogel which is obtained by removing water from said hydrogel. The organic/inorganic hybrid hydrogel comprises a water soluble polymer (A), a water swelling clay mineral (B) which can be homogeneously dispersed in water, and water (C), and water (C) is included in a three-dimensional network formed by (A) and (B).Type: GrantFiled: May 25, 2001Date of Patent: March 23, 2004Assignee: Kawamura Institute of Chemical ResearchInventor: Kazutoshi Haraguchi
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Publication number: 20040054127Abstract: A water-soluble block copolymer having a mass average molecular weight of 2500 to 800000 and comprising, within a molecule, a poly(ethylene imine) block unit and a poly(N-propionylethylene imine) block unit is a novel linear or star-shaped water-soluble block copolymer.Type: ApplicationFiled: September 15, 2003Publication date: March 18, 2004Applicant: KAWAMURA INSTITUTE OF CHEMICAL RESEARCHInventor: Ren-Hua Jin
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Publication number: 20010049413Abstract: The present invention provides a novel organic/inorganic hybrid hydrogel which is superior in homogeneity, transparency, mechanical properties, and in swelling and shrinking properties, a manufacturing method therefore, and a dry body of the organic/inorganic hybrid hydrogel which is obtained by removing water from said hydrogel. The organic/inorganic hybrid hydrogel comprises a water soluble polymer (A), a water swelling clay mineral (B) which can be homogeneously dispersed in water, and water (C), and water (C) is included in a three-dimensional network formed by (A) and (B).Type: ApplicationFiled: May 25, 2001Publication date: December 6, 2001Applicant: Kawamura Institute of Chemical ResearchInventor: Kazutoshi Haraguchi
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Patent number: 6319404Abstract: A porous material is disclosed, made of a semi IPN type polymer alloy of a crosslinked polymer (A) obtained by the crosslinking polymerization of a crosslinking-polymerizable vinyl monomer and/or oligomer (a) with a non-crosslinked polymer (D) which is soluble in a solvent (B) capable of dissolving said monomer and/or oligomer (a) therein and subjecting said crosslinked polymer (A) to gelation but is insoluble in a coagulating solution (C) which is compatible with said solvent (B) but doesn't subject said crosslinked polymer (D) to gelation. A porous material excellent in mechanical strength as well as in heat resistance can be prepared. Various functional groups can be introduced into the surface of the porous material. Further, the pore diameter can be easily controlled.Type: GrantFiled: April 23, 1997Date of Patent: November 20, 2001Assignees: Dainippon Ink Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Husheng Zhang, Takanori Anazawa, Yasuko Watanabe, Miyuki Miyajima
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Patent number: 5889073Abstract: Disclosed is a process for producing a material having hydrophilic surface which comprises forming a hydrophobic photopolymerizable composition comprising a hydrophobic compound (a) having two or more polymerizable unsaturated double bonds per molecule and a photopolymerization initiator into a desired form and irradiating the resultant shape (b) with actinic rays while keeping the surface of the shape (b) in contact with a hydrophilic liquid (d) containing a hydrophilic compound (c) having one or more polymerizable unsaturated double bonds under such conditions that a photopolymerization reaction is prevented from occurring in the hydrophilic liquid (d) except at the interface between the liquid (d) and the shape (b), whereby the shape (b) is cured and, at the same time, the hydrophobic compound (a) is copolymerized with the hydrophilic compound (c) at the interface between the shape (b) and the hydrophilic liquid (d) to chemically bond molecules of the hydrophilic compound (c) to the surface of the hydrophoType: GrantFiled: October 29, 1997Date of Patent: March 30, 1999Assignees: Dainippon Ink & Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Husheng Zhang, Takanori Anazawa, Hiroshi Ebato
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Patent number: 5374371Abstract: A liquid crystal device which comprises a pair of substrates having an electrode layer, at least one of said substrates being transparent, and a light-control layer supported between the substrate is disclosed, wherein said light-control layer comprises a continuous liquid crystal phase composed of a nematic liquid crystal material and a transparent solid substance having the three dimensional network existing in said continuous liquid crystal phase, said nematic liquid crystal material having an optical anisotropy (.DELTA.n) ranging from 0.18 to 0.3 and a dielectric anisotropy (.DELTA..epsilon.) ranging from 15 to 30. The device can be driven at a low voltage to provide a display of sufficient contrast and is applicable to a multiplexing drive system.Type: GrantFiled: July 29, 1993Date of Patent: December 20, 1994Assignees: Kawamura Institute of Chemical Research, Dainipponink and Chemicals, Inc.Inventors: Kiyofumi Takeuchi, Haruyoshi Takatsu
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Patent number: 5324451Abstract: A compound represented by formula (I): ##STR1## wherein R.sub.1 represents an alkyl group having from 1 to 18 carbon atoms; R.sub.2 represents an alkyl group having from 2 to 16 carbon atoms; rings A, B, C, and D each represents a 1,4-phenylene group or a 1,4-phenylene group having one or two halogen atoms; Y represents a single bond, ##STR2## m and n each represents 0 or 1; p represents 0, 1, or 2; q represents 0 or an integer of from 1 to 6; and C* and C** each represents an asymmetric carbon atom in an (S)- or (R)-configuration, and a liquid crystal composition containing the compound of formula (I). The compound of formula (I) is a chiral liquid crystal compound exhibiting large spontaneous polarization, a long helical pitch, an SC* phase in a broad temperature range including room temperature, satisfactory orientation, and a high rate of response.Type: GrantFiled: April 20, 1992Date of Patent: June 28, 1994Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Sadao Takehara, Tadao Shoji, Hiroshi Ogawa, Toru Fujisawa, Masashi Osawa
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Patent number: 5304323Abstract: A liquid crystal device comprising a pair of substrate, at least one of them being transparent, and a light-control layer supported therebetween, wherein said light-control layer comprises a liquid crystal material showing positive dielectric anisotropy and a transparent solid substance, said liquid crystal material forming a continuous phase, and said transparent solid substance existing in said continuous phase in the form of dispersed particles or a three-dimensional network. The device exhibits a clear threshold voltage, a high fast response time and a highly contrast display with a low applied voltage.Type: GrantFiled: December 1, 1992Date of Patent: April 19, 1994Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Yoshi Arai, Toru Fujisawa, Kiyohumi Takeuchi, Haruyoshi Takatsu, Koichiro Adachi, Hiroshi Ogawa, Kazunori Maruyama
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Patent number: 5128472Abstract: A 2,5-disubstituted pyrizine derivative and a 2,5-disubstituted pyrimidine derivative of the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each independently represents a straight-chain or branched alkyl group containing 1 to 20 carbon atoms;X represents a halogen atom; and ##STR2## represents a pyrazine-2,5-diyl or a pyrimidine-2,5-diyl group; each useful as an electrooptical display material are disclosed. Further a liquid crystal composition comprising said compounds as well as a ferroelectric display device wherein said liquid crystal composition is used are disclosed.Type: GrantFiled: October 31, 1990Date of Patent: July 7, 1992Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Masashi Osawa, Tadao Shoji, Sadao Takehara, Hiroshi Ogawa, Toru Fujisawa, Takeshi Kuriyama, Kayoko Nakamura
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Patent number: 5061398Abstract: An optically active lactone derivative represented by the following general formula (I): ##STR1## wherein R.sup.1 represents a straight-chain or branched alkyl, alkoxyl, alkanoyloxy, alkoxycarbonyl, alkoxyalkyl, alkoxyalkanoyloxy, or alkoxyalkoxyl group having 1 to 20 carbon atoms or an optically active group of each of the above kinds, R.sup.2 represents a straight-chain or branched alkyl group having 1 to 20 carbon atoms, ##STR2## or trans-1,4-cyclohexylene group of the formula and the asymmetric carbon atoms at the 2- and 4-positions in the lactone ring each independently is of the (S) or (R) configuration, an intermediate therefor, a process for producing the intermediate, a liquid-crystal composition, and a liquid-crystal display device.Type: GrantFiled: April 27, 1990Date of Patent: October 29, 1991Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical Research, Sagami Chemical Research CenterInventors: Sadao Takehara, Takeshi Kuriyama, Kayoko Nakamura, Tadao Shoji, Toru Fujisawa, Masashi Osawa, Tamejiro Hiyama, Tetsuo Kusumoto, Akiko Nakayama, Kiyoharu Nishide
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Patent number: 4943386Abstract: A liquid crystalline compound represented by formula ##STR1## wherein R denotes an alkyl or alkoxy group having 1 to 20 carbon atoms,m and n are each 0 or 1, provided m and n are not 1 at the same time. ##STR2## X and Y each denote a hydrogen atom, a halogen atom or a nitro group, provided X and Y are not hydrogen atoms at the same time, andQ* denotes an optically active group having an asymmetric carbon atom and a linear or cyclic alkyl or alkenyl group which may be substituted by a halogen atom, or the like.Type: GrantFiled: October 4, 1988Date of Patent: July 24, 1990Assignees: Dainippon Ink & Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Sadao Takehara, Toru Fujisawa, Yoshi Arai, Jitsuo Kurokawa
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Patent number: 4914224Abstract: An optically active carboxylic acid derivative represented by the general formula ##STR1## wherein R represents a normal alkyl group having 1 to 20 carbon atoms, m and n represent 0 or 1 but are not 1 at the same time, X represents a hydrogen or halogen atom, Y represents a hydrogen or fluorine atom, provided that when Y is a hydrogen atom, X is a halogen atom, and that when n is 0, Y is ahydrogen atom, and Q* represents an optically active alkyl or 1-alkoxyethyl group having an asymmetric carbon atom.Type: GrantFiled: January 28, 1987Date of Patent: April 3, 1990Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Tadao Shoji, Sadao Takehara, Toru Fujisawa, Masashi Osawa, Hiroshi Ogawa, Yoshi Arai, Jitsuo Kurokawa