Patents Assigned to Kureha Kagaku Kogyo Kabushiki Kaisha
  • Process for separating isomers of azolylmethylcyclopentanol derivatives
    Patent number: 5446167
    Abstract: A process for separating a cis isomer from a mixture of the cis isomer and a trans isomer of an azolylmethylcyclopentanol derivative of the formula (I): ##STR1## wherein, R.sup.1 and R.sup.2 each independently represent a hydrogen atom or an alkyl group; each X represents a halogen atom, an alkyl group, a haloalkyl group, a phenyl group, a cyano group or a nitro group; n is an integer of from 0 to 5; A represents a nitrogen atom or a CH group; and each X may be identical or different when n is an integer of from 2 to 5, comprising the steps of dehydrating selectively the trans isomer in the presence of an acid and isolating the cis isomer.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: August 29, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Shoichiro Hayashi, Kazuhiko Sunagawa, Satoru Kumazawa
  • Polyvinyl alcohol product and multi-layer product containing the same
    Patent number: 5439745
    Abstract: Disclosed herein are a polyvinyl alcohol product obtained by heat-treating a melt-molded polyvinyl alcohol product composed of a polyvinyl alcohol composition containing 0.01 to 3.0 mmol of a metal compound based on 1 g of polyvinyl alcohol; a polyvinyl alcohol product obtained by stretching a melt-molded polyvinyl alcohol product composed of a polyvinyl alcohol composition containing 0.01 to 3.0 mmol of a metal compound based on 1 g of polyvinyl alcohol; and a multi-layer product comprising at least one inner layer of a melt-molded product composed of a polyvinyl alcohol composition containing 0.01 to 3.0 mmol of a metal compound based on 1 g of polyvinyl alcohol.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: August 8, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hiroyuki Ohba, Kazuhiko Hirose, Hideaki Tanaka, Nobuyuki Hisazumi
  • Composition comprising polyarylene sulfide and polyamide composition
    Patent number: 5436300
    Abstract: A composition is disclosed, comprising(1) a polyamide as a dispersed phase and(2) a polyarylene sulfide as a continuous phase, wherein at least a part of the polyarylene sulfide has at least one modifying group directly bonded to the aromatic ring thereof, where the modifying group is selected from the group consisting of a carboxyl group, an alkali metal salt of a carboxyl group, and an alkaline earth metal salt of a carboxyl group, and where the modifying group is present at a ratio of 10 or more millimoles of the modifying group per kilogram of the polyamide. The composition has improved mechanical strength.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: July 25, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Ken Kashiwadate, Mitsuru Hoshino, Shuji Morinishi, Yukichika Kawakami
  • Permeable magnetic composition and magnetic component
    Patent number: 5435929
    Abstract: Magnetic components having a higher permeability than those obtained from Ni-Zn-based ferrite powder can be obtained by molding a composition comprising 5-30 wt. parts of polyarylene sulfide resin and 70-95 wt. parts (providing 100 wt. parts with the resin) of Ni-Zn-Cu-based ferrite powder. The Ni-Zn-Cu-based ferrite has a composition represented by the following formula (1):Ni.sub.a Zn.sub.b Cu.sub.c Fe.sub.2 O.sub.d,wherein a, b, c and d are numbers satisfying 0.10.ltoreq.a .ltoreq.0.70, 0.10.ltoreq.b.ltoreq.0.80, 0.10.ltoreq.c.ltoreq.0.35 and 3.97.ltoreq.d .ltoreq.4.20.
    Type: Grant
    Filed: February 4, 1994
    Date of Patent: July 25, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masashito Tada, Keiichiro Suzuki
  • Wave-receiving piezoelectric device
    Patent number: 5432396
    Abstract: A wave-receiving piezoelectric device for use as, e.g., a hydrophone or a microphone, is constituted by a piezoelectric body having two surfaces sandwiching a thickness and including at least one surface provided with a recess (including a perforation communicating with the two surfaces) set in the thickness direction, and a rigid member having a contact surface and an outer surface opposite to the contact surface and disposed to cover said at least one surface with the contact surface so as to make the recess airtight. As a result, an acoustic pressure received by the outer surface is concentrated and applied onto said at least one surface of the piezoelectric body, thereby giving an improved wave-receiving sensitivity at an enhanced acoustic pressure.
    Type: Grant
    Filed: March 11, 1994
    Date of Patent: July 11, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takashi Sato, Kazuyuki Suzuki, Nobuhiro Moriyama, Kenichi Nakamura
  • Core material of string for instruments and string for instruments using the same
    Patent number: 5427008
    Abstract: Core materials for strings for musical instruments of a twist of two or more multifilaments composed of a vinylidene fluoride resin. The multifilament core has a diameter of 0.1 to 5 mm, an elongation of 10 to 50%, a tensile strength of at least 30 kg/mm.sup.2, a creep elongation of at most 15% and a Young's modulus of at least 200 kg/mm.sup.2. The multifilament is made of monofilaments each having a diameter of 1 to 300 .mu.m, a dispersion diameter of at most 20%/m, a specific gravity of at least 1.6, an inherent viscosity of 0.85 to 1.6 dl/g, an apparent viscosity of 12,000 to 100,000 poise and a birefringence of 30.times.10.sup.-3. Strings for violins, cellos and the like are made by tightly wrapping the core with a metal string.
    Type: Grant
    Filed: February 1, 1994
    Date of Patent: June 27, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hisaaki Ueba, Kazuaki Ohashi, Yosio Sunaga
  • Vinylidene fluoride copolymer, and binder composition containing the copolymer for non-aqueous solvent-type secondary battery
    Patent number: 5415958
    Abstract: A vinylidene fluoride copolymer containing a carboxyl group or a carbonate group is formed by copolymerizing a monomer principally comprising vinylidene fluoride with a relatively small amount of an unsaturated dibasic acid monoester or vinylene carbonate. The copolymer has a large adhesion to various substrates or fillers and is excellent in chemical resistance, so that it is useful as a basic substance constituting a binder, an adhesive, a paint, etc. The copolymer is particularly effectively used as a binder for constituting an electrode for a non-aqueous solvent-type secondary battery together with an active substance, or an active substance and an electroconductive material, respectively in a particulate form.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: May 16, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yosuke Takahashi, Fujio Suzuki, Takao Iwasaki
  • Cyclopentanecarboxylic acid derivatives useful for producing azole compounds
    Patent number: 5414105
    Abstract: Disclosed herein are an azole derivative represented by the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 respectively represent a (C.sub.1 -C.sub.5) alkyl group or a hydrogen atom; X represents a halogen atom, a (C.sub.1-C.sub.5) alkyl group or a phenyl group; n represents an integer of from 0 to 2 and A represents a nitrogen atom or a CH, provided that R.sup.1 is not a hydrogen atom when R.sup.2 is a hydrogen atom, a process for producing the azole derivative represented by the formula (I), and an agricultural and horticultural composition containing the azole derivative represented by the formula (I).
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: May 9, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Satoru Kumazawa, Susumu Shimizu, Hiroyuki Enari, Atsushi Ito, Susumu Ikeda, Nobuo Sato, Toshihide Saishoji
  • Piezoelectric device and process for production thereof
    Patent number: 5410210
    Abstract: A sheet-form piezoelectric device having improved mechanical strengths as represented by an electrode peel strength while retaining flexibility and piezoelectric performances of a polymer-type piezoelectric device, is obtained by embedding a perforated sheet electrode into at least one surface layer of a polymer piezoelectric film treated with a solvent in advance. The sheet-form piezoelectric device may be wound or curved about a certain central axis to provide a tubular or curved piezoelectric device having wave-transmitting and/or -receiving characteristics suitable for wave-transmitting and/or -receiving devices, such as a hydrophone and microphone.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: April 25, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takashi Sato, Kazuyuki Suzuki, Nobuhiro Moriyama, Kenichi Nakamura
  • 4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine-6-carboxylic acid amide
    Patent number: 5401736
    Abstract: Disclosed herein are 4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine-6-carboxylic acid amide derivatives having a high antagonistic activity against angiotensin II and a high specificity to angiotensin II receptors, intermediates for preparing the derivatives, and antagonists against angiotensin II comprising the derivatives.
    Type: Grant
    Filed: September 16, 1993
    Date of Patent: March 28, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hiroyuki Enari, Mikiro Yanaka
  • Method of improving city water
    Patent number: 5391302
    Abstract: The Langelier index and pH of city drinking water are improved by mixing and reacting a slurry of calcium carbonate and slaked lime covered with calcium carbonate produced in a slaked lime dissolving vessel with carbonic acid-containing water in a mixing and reacting vessel to make a calcium hydrogen carbonate aqueous solution which in turn is continuously added to water in a water-receiving vessel together with the aqueous solution of slaked lime. As a result, unused undissolved matter is decreased, and the Langelier index of drinking water can be improved.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: February 21, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Isao Funahashi, Kiwamu Yamamoto
  • Surface roughening of resin molded articles for metallizing
    Patent number: 5342654
    Abstract: A method for roughening the surface of a resin molded article to make it susceptible to metallizing is disclosed, comprising contacting a resin molded article at least the surface of which to be toughened mainly comprises a block copolymer comprising 100 parts by weight of a polyphenylene sulfide resin and from 30 to 100 parts by weight of a polyphenylene sulfide ketone resin with a solvent capable of dissolving a polyphenylene sulfide ketone resin more than a polyphenylene sulfide resin.
    Type: Grant
    Filed: June 18, 1992
    Date of Patent: August 30, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tomoyoshi Koizumi, Yukio Ichikawa
  • Flat plate-like ribbed porous carbon material and manufacturing method therefor
    Patent number: 5338320
    Abstract: A ribbed porous carbon material (1) is a one piece molded product containing carbon fibers (5) and having a rib portion ( 2) and a web portion (3), in which the carbon fibers (5) are oriented in the rib portion (2) along the direction of the thickness of the web portion (3), while the carbon fibers (5) are oriented in the web portion (3) along the direction of the plane of the web portion (3) and along the direction perpendicular to the rib portion (2).
    Type: Grant
    Filed: April 21, 1993
    Date of Patent: August 16, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hiroyuki Fukuda, Masayuki Funabashi, Hikonori Abe
  • Biaxially oriented laminated film
    Patent number: 5336549
    Abstract: Disclosed herein is a biaxially oriented laminated film comprising at least a surface layer of a polyester containing not less than 88 mol. % of terephthalic acid as an acid ingredient, an intermediate layer of a polyamide having a melting point of higher than 160.degree. C. and lower than 210.degree. C. and a heat-sealing layer or a polyolefin, the thickness of the polyester layer being lower than the thickness of the polyamide layer.
    Type: Grant
    Filed: August 13, 1991
    Date of Patent: August 9, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshiharu Nishimoto, Kengo Yamazaki, Takashi Sato, Eiichi Hayashi, Hajime Takamoto
  • Resin for bonding polyarylene sulfide and adhesive
    Patent number: 5331029
    Abstract: A resin for bonding polyarylene sulfides is disclosed, comprising a copolymer wherein a main constituent element of the repeating unit of the copolymer is --A--Z--R--Z--, wherein --Z--is an ester linkage; A is an arylene sulfide oligomer component block comprising one or more arylene groups; and R is an organic compound residue formed by removing one atom or one group attached to each of two carbon atoms among carbon atoms constituting either an aliphatic main chain or an aromatic ring and has at most a molecular weight corresponding to an oligomer, but is different from A. An adhesive comprising the resin and a pyrrolidone solvent is also disclosed.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: July 19, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hiroyuki Sato, Kazuhiro Watanabe, Toshiya Watanabe
  • Method of welding tubular products of polyarylene sulfide and welded tubular structure
    Patent number: 5328541
    Abstract: A pair of tubular products of polyarylene sulfide having end faces to be welded are welded to each other by heating the end faces by a hot plate in no contact with the end faces to a surface temperature which is at least the melting heat-absorption peak temperature and at most 80.degree. C. above the melting initiation temperature of the polyarylene sulfide, and abutting the end faces under a pressure of 50-1500 kPa when the end faces are at a surface temperature which is at least 10.degree. C. above the melting initiation temperature and not exceeding the melting heat-absorption peak temperature of the polyarylene sulfide. As a result, a welded tubular structure having a weld with a small inside bead but having a sufficiently large weld strength can be obtained with substantially no thermal degradation and at a good operating efficiency.
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: July 12, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Satoshi Usui, Kouichi Kodama, Yoichiro Yamanobe, Ken Kashiwadate
  • Surface roughening of resin molded articles for metallizing
    Patent number: 5326593
    Abstract: A method for roughening the surface of a resin molded article to make it susceptible to metallizing is disclosed, including contacting a resin molded article at least the surface portion of which to be roughened mainly includes a block copolymer including 100 parts by weight of a polyarylene sulfide component block and from 100 to 200 parts by weight of a polyarylene sulfide ketone component block with a solvent capable of dissolving a polyarylene sulfide ketone more than a polyarylene sulfide.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: July 5, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tomoyoshi Koizumi, Yukio Ichikawa
  • Polyvinyl alcohol product and multi-layer product containing the same
    Patent number: 5317052
    Abstract: Disclosed herein are polyvinyl alcohol products obtained by heat-treating a melt-molded polyvinyl alcohol product composed of a polyvinyl alcohol composition containing 0.01 to 3.0 mmol of a metal compound based on 1 g of polyvinyl alcohol;a polyvinyl alcohol product obtained by stretching a melt-molded polyvinyl alcohol product composed of a polyvinyl alcohol composition containing 0.01 to 3.0 mmol of a metal compound based on 1 g of polyvinyl alcohol; anda multi-layer product comprising at least one inner layer of a melt-molded product composed of a polyvinyl alcohol composition containing 0.01 to 3.0 mmol of a metal compound based on 1 g of polyvinyl alcohol.
    Type: Grant
    Filed: November 19, 1991
    Date of Patent: May 31, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hiroyuki Ohba, Kazuhiko Hirose, Hideaki Tanaka, Nobuyuki Hisazumi
  • Flexible piezoelectric device
    Patent number: 5288551
    Abstract: A laminated piezoelectric device is formed by sandwiching a relatively rigid central electrode layer with a pair of piezoelectric polymer films and then with a pair of outer electrode layers which are less rigid than the central electrode layer. The laminated piezoelectric device, as a whole, has a good flexibility and shows good piezoelectric characteristics represented by a hydrostatic piezoelectric constant d.sub.h and a symmetrical vibration characteristic. The outer electrode layers may preferably be constituted as a sprayed coating electrode which shows good solderability and peel strength.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: February 22, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takashi Sato, Kazuyuki Suzuki, Kenichi Nakamura
  • Method for inhibiting aromatase
    Patent number: 5286737
    Abstract: This invention provides a method of inhibiting aromatase and treating of estrogen-dependent diseases in a patient by administering azole derivatives as nonsteroidal inhibitors. The azole derivative has the formula ##STR1## where R.sub.1 a is hydrogen or a (C.sub.1 -C.sub.5) alkyl; R.sub.2 is a hydrogen or a (C.sub.1 -C.sub.5) alkyl; R.sub.3 is any of a halogen, a (C.sub.1 -C.sub.5)alkyl, a haloalkyl, a phenyl, a cyano, or nitro; n is 0 to 5; and Y is a nitrogen atom or CH.
    Type: Grant
    Filed: September 16, 1992
    Date of Patent: February 15, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Akira Kato, Junko Miyagawa, Yuko Ikeda, Koichi Niimura