Patents by Inventor Michihiro Ishiguro
Michihiro Ishiguro 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: 5912193Abstract: Disclosed are thermoplastic polyurethanes obtainable by reacting (a) a polyester-polyol that satisfies all the following requirements (1) to (4):(1) its ester group content (number of ester bonds/number of all carbon atoms) is from 0.08 to 0.17;(2) it has hydroxyl groups of from 2.01 to 2.08 per one molecule;(3) it has a number average molecular weight of from 1000 to 7000; and(4) it has a crystallization enthalpy (.DELTA.H) of 70 J/g or less,(b) an organic diisocyanate and (c) a chain extender at a ratio that satisfies the following numerical formula (i):1.00.ltoreq.b/(a+c).ltoreq.1.Type: GrantFiled: March 3, 1998Date of Patent: June 15, 1999Assignee: Kuraray Co., Ltd.Inventors: Shizuo Iwata, Shinya Katoh, Kimio Nakayama, Tetsuya Ashida, Hisao Yoneda, Michihiro Ishiguro, Koji Hirai
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Patent number: 5780573Abstract: Disclosed are thermoplastic polyurethanes obtainable by reacting (a) a polyester-polyol that satisfies all the following requirements (1) to (4):(1) its ester group content (number of ester bonds/number of all carbon atoms) is from 0.08 to 0.17;(2) it has hydroxyl groups of from 2.01 to 2.08 per one molecule;(3) it has a number average molecular height of from 1000 to 7000; and(4) it has a crystallization enthalpy (.DELTA.H) of 70 J/g or less,(b) an organic diisocyanate and (c) a chain extender at a ratio that satisfies the following numerical formula (i):1.00.ltoreq.b/(a+c).ltoreq.1.Type: GrantFiled: May 23, 1996Date of Patent: July 14, 1998Assignee: Kuraray Co., Ltd.Inventors: Shizuo Iwata, Shinya Katoh, Kimio Nakayama, Tetsuya Ashida, Hisao Yoneda, Michihiro Ishiguro, Koji Hirai
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Patent number: 5688890Abstract: A thermoplastic polyurethane composition comprises a thermoplastic polyurethane and a tin compound. The tin compound is contained in an amount of 0.3 to 15 ppm as converted into tin atom based on the thermoplastic polyurethane. The thermoplastic polyurethane composition has a retention ratio of long-chain hard segments when melt treated at 220.degree. C. for 60 minutes of at least 85%. The thermoplastic polyurethane composition also has a retention ratio of inherent viscosity when melt treated at 220.degree. C. for 6 minutes and then melt extruded and, thereafter, allowed to stand at 20.degree. C., 60% RH (relative humidity) for 24 hours of at least 85%. The thermoplastic polyurethane composition has excellent mold-ability and gives molded products being excellent in tensile strength and elongation, heat resistance, compression set, resistance to hydrolysis and like properties, and are hence useful as a raw material for various items.Type: GrantFiled: December 29, 1994Date of Patent: November 18, 1997Assignee: Kuraray Co., Ltd.Inventors: Michihiro Ishiguro, Tatuya Oshita, Hiroyuki Ono, Kimio Nakayama, Koji Hirai
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Patent number: 5606005Abstract: A polyurethane made of polyester diol units, organic diisocyanate units and units from a chain extender, wherein the polyester diol units contain dicarboxylic acid units and diol units, wherein at least 30 mole % of the dicarboxylic acid units are units derived from 3,8-dimethyldecanedioic acid, 3,7-dimethyldecanedioic acid or a mixture thereof, and wherein the polyester diol units have a number-average molecular weight in a range from 500 to 6000 is provided along with the polyester diol for preparing the polyurethane, polyurethane fibers prepared from the polyurethane, a molded article prepared from the polyurethane and processes for producing the polyurethane, polyester diol, dimethyldecanedioic acids and dimethyldecanedials used to prepare the dimethyldecanedioic acids; where the polyurethane and fibers produced therefrom are superior in various properties such as hydrolytic resistance, heat resistance, resistance to hot water, cold resistance, fungal resistance and mechanical performances e.g.Type: GrantFiled: November 16, 1995Date of Patent: February 25, 1997Assignee: Kuraray Co., Ltd.Inventors: Tatuya Oshita, Kimio Nakayama, Michihiro Ishiguro, Koji Hirai, Shigeaki Suzuki, Noriaki Yoshimura
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Patent number: 5310852Abstract: Provided is an elastic polyurethane fiber comprising a polyurethane obtained by copolymerizing a polymer diol (A), an organic diisocyanate (B) and a chain extender (C);said polymer diol (A) that constitutes the polyurethane being a polyester diol and/or polyesterpolycarbonate diol having an average molecular weight of 1,000 to 6,000, and satisfying the following condition (I); ##EQU1## wherein the total number of carbon atoms means the number of the carbon atoms contained in the polymer diol and excluding those contained in the ester bonds and carbonate bonds thereof;the diol units that constitute said polymer diol containing branched diols in an amount of at least 10 mol %;said polyurethane constituting said elastic fiber satisfying the following conditions (II) and (III)45%.ltoreq.long chain hard segment content.ltoreq.Type: GrantFiled: December 21, 1992Date of Patent: May 10, 1994Assignee: Kuraray Co., Ltd.Inventors: Koji Hirai, Michihiro Ishiguro, Tatuya Oshita, Setuo Yamashita, Katsura Maeda, Yukiatsu Komiya
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Patent number: 5070172Abstract: In the preparation of a polyurethane from a polymeric polyol and an organic polyisocyanate, by using as the polyol a polymeric polyol containing in the molecule thereof 2-methyl-1,8-octanediol residue, a novel polyurethane having excellent resistance to hydrolysis, low temperature characteristics and abrasion resistance can be obtained.Type: GrantFiled: September 22, 1988Date of Patent: December 3, 1991Assignee: Kuraray Co., Ltd.Inventors: Koji Hirai, Shunro Taniguchi, Michihiro Ishiguro, Yoshifumi Murata, Shinichi Yokota, Masao Ishii, Noriaki Yoshimura, Takayuki Okamura
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Patent number: 4639471Abstract: A process for producing a novel polyester polyurethane having excellent hydrolysis resistance and excellent flexibility at low temperature, which is obtained from a polyisocyanate and a polyester polyol which is obtained by reaction a dicarboxylic acid with a mixture of 1,9-nonanediol and a polyol represented by the formula ##STR1## wherein R.sup.1 denotes methyl group or ethyl group, R.sup.2 denotes hydrogen atom, methyl group, ethyl group, hydroxymethyl group or hydroxyethyl group, and n is an integer of 1 to 5, said polyester polyol having an average molecular weight of 500 to 30,000.Type: GrantFiled: February 6, 1986Date of Patent: January 27, 1987Assignee: Kuraray Co., Ltd.Inventors: Koji Hirai, Shunro Taniguchi, Michihiro Ishiguro, Yoshifumi Murata, Shinichi Yokota, Masao Ishii, Noriaki Yoshimura, Takayuki Okamura
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Patent number: 4436939Abstract: A process for producing 1-(p-prenylphenyl)ethanol, which comprises reacting p-chloroprenylbenzene with magnesium at a temperature between 100.degree. C. and 150.degree. C. to form a Grignard reagent, and then reacting it with acetaldehyde.Type: GrantFiled: August 25, 1982Date of Patent: March 13, 1984Assignees: Taisho Pharmaceutical Co., Ltd., Kuraray Co., Ltd.Inventors: Takehiro Amano, Kensei Yoshikawa, Tatsuhiko Sano, Yutaka Ohuchi, Michihiro Ishiguro, Manzo Shiono, Yoshiji Fujita, Takashi Nishida
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Patent number: 4433160Abstract: A process for producing an .alpha.-arylalkanoic acid ester represented by the general formula ##STR1## wherein Ar represents an aryl group which may optionally be substituted, and R.sup.1 and R.sup.2, independently from each other, represent a lower alkyl group,which comprises reacting a Grignard reagent prepared from an aryl halide of the general formulaAr--X.sup.1 (II)wherein Ar is as defined above and X.sup.1 represents a halogen atom,and magnesium, with an .alpha.-haloalkanoic acid ester of the general formula ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, and X.sup.2 represents a halogen atom,said reaction of the Grignard reagent with the .alpha.-haloalkanoic acid ester of general formula (III) being carried out in the presence of a nickel compound.Type: GrantFiled: August 25, 1982Date of Patent: February 21, 1984Assignee: Taisho Pharmaceutical Company, Ltd.Inventors: Takehiro Amano, Kensei Yoshikawa, Tatsuhiko Sano, Yutaka Ohuchi, Michihiro Ishiguro, Manzo Shiono, Yoshiji Fujita, Takashi Nishida
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Patent number: 4336202Abstract: Novel cyclohexanone derivatives of general formula: ##STR1## (wherein R.sup.1 is a hydrocarbon group of 1 to 15 carbon atoms) and new cyclohexanone derivatives of general formula: ##STR2## (wherein R.sup.1 and R.sup.2 each is a hydrocarbon group of 1 to 15 carbon atoms) are produced by an electrooxidative coupling of 1,3-cyclohexanedione with a vinyl ether of general formula:CH.sub.2 .dbd.CH-O-R.sup.1(wherein R.sup.1 is as defined above) in the presence or absence of an alcohol of general formula:R.sup.2 OH(wherein R.sup.2 is as defined above). These new cyclohexanone derivatives can be easily converted to N-substituted or unsubstituted-4-oxo-4,5,6,7-tetrahydroindoles, which are of value as intermediates for the production of N-substituted or unsubstituted-4-hydroxyindoles and, thence, to pindolol and its analogs.Type: GrantFiled: May 18, 1981Date of Patent: June 22, 1982Assignee: Kuraray Co., Ltd.Inventors: Sigeru Torii, Kenji Uneyama, Takashi Onishi, Yoshiji Fujita, Michihiro Ishiguro, Takashi Nishida
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Patent number: 4215230Abstract: Ionones and irones are produced by thermal rearrangement of novel propargylic alcohols, as follows: ##STR1## wherein R.sup.1 is a lower alkyl group, R.sup.2 is hydrogen or methyl and the dotted lines in the product formula reflect the existence of a double bond at either one or the other of the positions indicated.Type: GrantFiled: May 23, 1978Date of Patent: July 29, 1980Assignee: Kuraray Co., Ltd.Inventors: Takashi Ohnishi, Yoshiji Fujita, Michihiro Ishiguro, Takashi Nishida