Patents Assigned to Kuraray Company, Ltd.
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Patent number: 5719354Abstract: The invention provides a multilayer microelectronic circuit board including a laminate of a plurality of circuit layers containing conductive vias within the layers or a combination of conductive vias and conductive wiring patterns on a surface of the layers, the layers comprising a first liquid crystal polymer and, interposed between said circuit layers, a layer of second liquid crystal polymer having a melting point of at least about 10.degree. C. lower than the melting point of the first liquid crystal polymer.Type: GrantFiled: September 16, 1994Date of Patent: February 17, 1998Assignees: Hoechst Celanese Corp., Kuraray Company Ltd.Inventors: Randy Douglas Jester, Edwin Charles Culbertson, Detlef M. Frank, Sherman Hall Rounsville, John Arthur Penoyer, Takeichi Tsugaka, Minoru Onodera, Toshiaki Sato, Toru Sanefuji
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Patent number: 5495026Abstract: A phenol, a formaldehyde and an unsaturated compound having carbon-carbon double bond are reacted in the presence of a secondary amine and an acid at a temperature of 100.degree. to 250.degree. C., to give a chroman.Type: GrantFiled: September 13, 1994Date of Patent: February 27, 1996Assignee: Kuraray Company Ltd.Inventors: Eriko Fukumoto, Masahiro Torihara, Yoshin Tamai
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Patent number: 5439976Abstract: A polyester composition principally comprising a polyester and a specific block copolymer having terminal hydroxyl groups. The polyester composition is excellent not only in heat resistance, solvent resistance and processability, but also in shock resistance.Type: GrantFiled: July 12, 1994Date of Patent: August 8, 1995Assignee: Kuraray Company Ltd.Inventors: Satoshi Kinoshita, Hideo Takamatsu, Kazushige Ishiura, Haruhisa Masuda, Shunro Taniguchi
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Patent number: 5436295Abstract: A thermoplastic elastomer composition comprises the following two components:(a) a thermoplastic polyurethane having soft segments from a poly (3-methyl-1,5-pentane adipate) diol having a molecular weight of at least 2,000 and having a JIS A hardness at 25.degree. C. of not more than 80, and(b) a block copolymer comprising at least 2 polymer blocks A principally comprising an aromatic vinyl compound and at least 1 block B comprising an olefinic elastomer, said aromatic vinyl compound being contained in an amount of 5 to 50% by weight based on the weight of the block copolymer and the olefinic elastomer block having a glass transition point of not higher than -20.degree. C. and a heat of fusion of crystal of not more than 8 cal/g;the ratio by weight between the component (a) and the component (b) being (a)/(b)=95/5 to 5/95.Type: GrantFiled: January 7, 1994Date of Patent: July 25, 1995Assignee: Kuraray Company, Ltd.Inventors: Makoto Nishikawa, Katsuya Hashimoto, Masao Ishii
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Patent number: 5430095Abstract: A rubber composition having excellent processability and improved dispersion state of carbon black containing:a functional group-containing polymer having a number average molecular weight of 1,000 to 100,000 and comprising 0 to 60 mole % of a structural unit represented by the formula (1) and 100 to 40 mole % of a structural unit represented by formula (2) plus a structural unit represented by formula (3), the polymer having on one end of its molecule an average at least 0.6 group per molecule of a group represented by formula (4), a hydroxyl group or an amino group; ##STR1## wherein R.sup.1 represents a hydrogen atom or a methyl group, ##STR2## wherein R.sup.2 represents a hydrogen atom or a methyl group, ##STR3## wherein R.sup.3 represents a vinyl group or an isopropenyl group;--COOR.sup.4 (4)wherein R.sup.4 represents a hydrogen atom or an alkali metal;a solid rubber andcarbon black.Type: GrantFiled: September 1, 1993Date of Patent: July 4, 1995Assignee: Kuraray Company, Ltd.Inventors: Kazushige Ishiura, Hideo Takamatsu, Tsutomu Yamada, Atsuhisa Ogawa
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Patent number: 5414138Abstract: A process for producing 2-formyl-1,4-butanediol comprises effecting reaction of 2-butene-1,4-diol with hydrogen and carbon monoxide in the presence of:(a) a rhodium compound,(b) a tris(substituted aryl) phosphite having an electronic parameter, .nu.-value, of 2,080 to 2,090 cm.sup.-1 and a steric parameter, .theta.-value, of 135.degree. to 190.degree. and being represented by the formula P(OR).sub.3wherein each of R's, which may be the same or different, represents a substituted aryl group having at least 7 carbon atoms, and(c) a bis (diphenylphosphino) alkane represented by the formula Ph.sub.2 P-(CH.sub.2)n-PPh.sub.2 where n n is an integer of 2 to 6, andat a temperature of not more than 80.degree. C.Type: GrantFiled: June 2, 1994Date of Patent: May 9, 1995Assignee: Kuraray Company Ltd.Inventors: Toshihiro Omatsu, Yasuo Tokitoh
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Patent number: 5403905Abstract: Process for producing polyvinyl ester having a high degree of polymerization and an intrinsic viscosity of from 15 dl g.sup.-1 to 3.2 dl g.sup.-1, and a polyvinyl ester obtained thereby. The process comprises subjecting a vinyl ester monomer to emulsion polymerization using nonionic emulsifiers nonionic-anionic emulsifiers, or anionic emulsifiers and a redox initiator at a temperature of -60.degree. to 15.degree. C.Type: GrantFiled: February 3, 1994Date of Patent: April 4, 1995Assignee: Kuraray Company, Ltd.Inventors: Toshiaki Sato, Ken Yuki, Junnosuke Yamauchi, Takuji Okaya
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Patent number: 5393837Abstract: A polyester composition principally comprising a polyester and a specific block copolymer having terminal hydroxyl groups. The polyester composition is excellent not only in heat resistance, solvent resistance and processability, but also in shock resistance.Type: GrantFiled: January 7, 1994Date of Patent: February 28, 1995Assignee: Kuraray Company Ltd.Inventors: Satoshi Kinoshita, Hideo Takamatsu, Kazushige Ishiura, Haruhisa Masuda, Shunro Taniguchi
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Patent number: 5312978Abstract: A process for producing vitamin A acid, having useful biological activity, which comprises oxidizing vitamin A aldehyde with an aqueous solution of an alkali metal chlorite in the presence of an acid.Type: GrantFiled: March 19, 1993Date of Patent: May 17, 1994Assignee: Kuraray Company Ltd.Inventors: Toshiki Mori, Hiroshi Fujii, Takashi Onishi, Yoshin Tamai
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Patent number: 5278343Abstract: 2-Methyl-1-naphthol is obtained by isomerization of 2-methylene-1-tetralone. For the isomerization of 2-methylene-1-tetralone there is used a Pd-, Rh- or Ru-based catalyst that has been previously treated with hydrogen gas. 2-Methylene-1-tetralone synthesized from 1-tetralone by the Mannich reaction can be used for this purpose.Type: GrantFiled: February 22, 1993Date of Patent: January 11, 1994Assignee: Kuraray Company, Ltd.Inventors: Masato Taniura, Yoshin Tamai
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Patent number: 5237027Abstract: The present invention provides an alkaline water-soluble thermoplastic resin comprising units from isobutylene, units from maleic anhydride and units from n-butyl acrylate unit in a molar ratio of isobutylene units, maleic anhydride units and n-butyl acrylate units of 1:0.8-1.2:0.2-5.0.Type: GrantFiled: August 13, 1992Date of Patent: August 17, 1993Assignee: Kuraray Company, Ltd.Inventors: Toshimitu Kawame, Yoshiki Nobuto, Atsushi Ooishi, Shobu Minatono
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Patent number: 5237102Abstract: Provided is a novel process for readily producing .beta.-carotene in which a sulfone compound represented by the general formula (1), (2) or (3) is reacted with an alkali, ##STR1## wherein R represents a phenyl group which may be substituted, R' a protecting group of acetal type and X a halogen atom.Type: GrantFiled: August 31, 1992Date of Patent: August 17, 1993Assignee: Kuraray Company Ltd.Inventors: Toshiki Mori, Hiroshi Fujii, Takashi Onishi, Kazuo Yamamoto
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Patent number: 5185470Abstract: Provided is a process which comprises conducting the ring-closure of pseudoirone in the presence of chlorosulfonic acid, which is inexpensive, to obtain in a high yield the .alpha.-cis form of irone, which has nearly the same fragrance as that of natural irones.Type: GrantFiled: February 5, 1992Date of Patent: February 9, 1993Assignee: Kuraray Company, Ltd.Inventors: Goro Asanuma, Yoshin Tamai
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Patent number: 5185468Abstract: Provided is a novel process for readily producing .beta.-carotene by reacting a sulfone compound represented by the general formula (1), (2) or (3) with an alkali, ##STR1## wherein R represents a phenyl group which may be substituted, R' a protecting group of acetal type and X a halogen atom.Type: GrantFiled: May 28, 1991Date of Patent: February 9, 1993Assignee: Kuraray Company Ltd.Inventors: Toshiki Mori, Hiroshi Fujii, Takashi Onishi, Kazuo Yamamoto
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Patent number: 5118833Abstract: The invention provides a novel process for produing .alpha. -keto-carboxylic acid esters that are useful as intermediates for the preparation of pharmaceutical drugs in high yield by oxidizing .alpha. -hydroxycarbocylic acid esters with hypochlorous acid in the presence of nitroxy radical.Type: GrantFiled: June 14, 1990Date of Patent: June 2, 1992Assignee: Kuraray Company, Ltd.Inventors: Toshiki Mori, Shigeaki Suzuki, Takashi Onishi, Kazuo Yamamoto
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Patent number: 5087762Abstract: The invention provide a process for producing vitamin A aldehyde in high yield by oxidizing vitamin A with a aldehyde of the general formula (1) ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different and respectively represents a lower alkyl group or a lower alkenyl group in the presence of aluminum alkoxide in a catalytic amount.Type: GrantFiled: November 28, 1990Date of Patent: February 11, 1992Assignee: Kuraray Company Ltd.Inventors: Toshiki Mori, Takashi Onishi, Kazuo Yamamoto
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Patent number: 5084464Abstract: The present invention provides conjugated .gamma.-hydroxybutenolide compounds represented by the general formula: ##STR1## wherein R represents, when n is 1, furyl groups, thienyl groups or naphthyl groups, unsubstituted or substituted with alkyl group or alkoxy group; phenyl groups substituted with dialkylamino group, acyl group or pyridinyl group; or ##STR2## when n is 2 or 3, phenyl groups unsubstituted or substituted with alkyl group or alkoxy group; and antiulcer agents comprising an aforementioned conjugated .gamma.-hydroxybutenolide compound as an active ingredient.Type: GrantFiled: September 13, 1990Date of Patent: January 28, 1992Assignee: Kuraray Company Ltd.Inventors: Yoshin Tamai, Masahiro Torihara, Yoichi Kido, Johji Yamahara
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Patent number: 5066826Abstract: A process for the racemization of optically active 4-phenylbutanoic acid esters which comprises treating optically active 4-phenylbutanoic acid esters of the general formula (1) ##STR1## wherein R.sup.1 represents a hydroxy group, a hydroxy group protected by vinyl ester, or a lower acyloxy group and R.sup.2 represents a lower alkyl group with a base selected from the group consisting of alkali metal alcoholates, alkali metal hydrides, and alkali metal amides is provided.Type: GrantFiled: September 26, 1990Date of Patent: November 19, 1991Assignee: Kuraray Company, Ltd.Inventors: Hiroyuki Nohira, Takashi Onishi, Kazuo Yamamoto, Noriaki Kumagai
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Patent number: 5059482Abstract: Provided is a composite fiber comprising an ethylenevinyl alcohol copolymer (component A) and a polyester (component B) heterogeneously blended with each other. In the cross section of the fiber, component A is distributed in islands form locally, and the region of component B where component A is not present containing a component B zone containing a circular area having a diameter at least 1/20 that of the fiber. By assuming the above structure, the fiber has good bulk, touch and silhouette, and a feeling similar to that of natural fibers, having solved the problems inherent to polyester fibers, such as oil soiling, soil redeposition by washing and soiling by sublimation and migration of disperse dye, while making use of superior features of polyester fiber, such as high strength, modulus, abrasion resistance, chemical resistance, weather resistance and dimensional stability.Type: GrantFiled: September 7, 1989Date of Patent: October 22, 1991Assignee: Kuraray Company, Ltd.Inventors: Masao Kawamoto, Kazuhiko Tanaka, Kiyoshi Hirakawa, Shinji Yamaguchi, Tomoyasu Takegami
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Patent number: 5057390Abstract: A photosensitive composition characterized by comprising:(a) a vinyl alcohol polymer containing the following structural unit A and having a saponification degree of a vinyl ester unit of not less than 70 mol %: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each represents H or a hydrocarbon group having 1 to 4 carbon atoms;(b) a radically polymerizable ethylenic unsaturated compound; and,(c) a photopolymerization initiator,having flexiblity and impact resistance which can maintain sufficient softness but are not broken particularly even at low temperature and low humidity so that resin plates showing high printing quality can be obtained from the photosensitive composition.Type: GrantFiled: November 20, 1986Date of Patent: October 15, 1991Assignee: Kuraray Company, Ltd.Inventors: Toshiaki Sato, Junnosuke Yamuchi, Takuji Okaya