Patents Assigned to Asahi Kasei Kogyo Kabushiki Kaisha
  • Patent number: 6117542
    Abstract: A flame retardant resin composition comprising a thermoplastic resin/flame retardant mixture having fluororesin fibrils dispersed therein, wherein, when a breakage-exposed surface of a tensile force-broken piece of a test sample prepared from the flame retardant composition by injection molding so as to be used in a flame retardancy test by the Vertical Burning Method described in UL-Subject 94 is examined by means of a SEM with respect to a predetermined area of 7 .mu.m.times.7 .mu.m wherein the fibrils are dispersed in the entire region of the predetermined area, the dispersed fibrils exhibit a dispersion morphology in which the fibrils have a diameter of 0.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: September 12, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Nobutsugu Nanba, Hideki Nasu
  • Patent number: 6117474
    Abstract: An aqueous suspension composition containing at least 2 wt. % of a fine cellulose and a water-insoluble calcium material which have been subjected to a wet co-grinding treatment, having a weight ratio of the fine cellulose to the water-insoluble calcium material of from 1/9 to 9/1 and having a proportion of particles having a particle size of at least 10 .mu.m of not greater than 40%; a preparation process therefor; and a water-dispersible dry composition and a food composition using the same.
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: September 12, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Etsuo Kamada, Nobuyoshi Mochihara
  • Patent number: 6117969
    Abstract: A polycarbonate resin composition comprising (A) 5 to 95 parts by weight of a polycarbonate resin comprising a plurality of aromatic polycarbonate main chains, wherein the aromatic polycarbonate main chains collectively contain specific heterounits in a specific amount in the polycarbonate main chains, and (B) 5 to 95 parts by weight of a rubber-reinforced thermoplastic resin comprising a graft copolymer which is obtained by a method comprising grafting on a rubber polymer at least one vinyl compound. The resin composition of the present invention has high impact resistance and high moldability. When the resin composition further comprises a flame retardant (C) and an anti-dripping agent as optionally components, the resin composition has an extremely high dripping-preventive property, as compared to a conventional polycarbonate resin composition containing a flame retardant and an anti-dripping agent.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: September 12, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Nobutsugu Nanba, Hiroshi Hachiya
  • Patent number: 6114001
    Abstract: In an optical recording information recording medium of a structure having protection layers on both surfaces of a recording layer, overwrite cyclability is improved without deteriorating the reliability of recorded data.To achieve this, the first protection layer is deposited by a sputtering method from a target made of a mixture comprising ZnS and SiO.sub.2 without adding an O.sub.2 gas and a H.sub.2 gas to a sputtering atmosphere, the second protection layer is deposited by a sputtering method using a target made of a mixture comprising ZnS and SiO.sub.2 by adding an O.sub.2 gas and an H.sub.2 gas to the sputtering atmosphere.Especially, an optical information recording medium having a high reliability of recorded data and capable of overwriting of 300,000 cycles or more can be obtained, particularly, by controlling the partial pressure of the added O.sub.2 gas to 10.times.10.sup.-6 -50.times.10.sup.-6 Torr and the partial pressure of the added H.sub.2 gas to 20.times.10.sup.-6 -50.times.10.sup.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: September 5, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Masaru Suzuki, Akihiko Ohyama
  • Patent number: 6113785
    Abstract: A polysulfone membrane for purifying blood having excellent compatibility with blood and the process producing the membrane are disclosed. The membrane comprises a mixed polymer phase of a graft copolymer and/or block copolymer having a molecular weight of 3.times.10.sup.5 daltons or more and comprising (A) a hydrophilic segment and (B) a hydrophobic segment (exclusive of polysulfone) in a total amount of from 0.5 to 30 parts by weight per 100 parts by weight of polysulfone, with the monomer unit ratio (A/B) between the segments A and B being from 0.5 to 5. The copolymer is preferably a graft copolymer where the hydrophilic segment is a polyvinylpyrrolidone segment and the hydrophobic segment is a polystyrene segment. The membrane can be prepared by applying a wet film formation process to a dope containing an appropriate solvent of the mixed polymer, such as N,N-dimethylacetamide.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: September 5, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Morikazu Miura, Yoshiaki Nitadori, Akira Kiguchi, Shigemi Mukaiyama
  • Patent number: 6111048
    Abstract: Disclosed is a novel blocked polyisocyanate obtained by blocking the terminal isocyanate groups of a non-blocked polyisocyanate with a thermally dissociative blocking agent, wherein the non-blocked polyisocyanate is obtained by reacting at least one diisocyanate selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate with a polyhydroxy compound having an average number of hydroxyl groups as many as 4.5 to 10, and removing substantially all unreacted diisocyanate monomers. A coating composition comprising the blocked polyisocyanate of the present invention as a curing agent and a polyol as a main agent not only has excellent curability even under low temperature conditions, but is also capable of forming a coating which has excellent impact resistance.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: August 29, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Yoshiyuki Asahina, Taketoshi Usui
  • Patent number: 6110440
    Abstract: A fluidized-bed reactor for ammo-oxidation or oxidation and an ammo-oxidation or oxidation process using the reactor. The reactor comprises a vessel, a sparger for supplying and dispersing a gas containing an organic material, and a distributor for supplying and dispersing an oxygen-containing gas, the sparger comprising a header and a plurality of dispersion pipes connected laterally to the header, the dispersion pipes each having a plurality of orifices, wherein the hole size of an orifice farthest from the header is larger than the hole size of an orifice nearest the header, and the hole size of one orifice is larger than or equal to the hole size of adjacent orifice that is nearer the header than the one orifice.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: August 29, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Masanobu Ohta, Morihide Yokura
  • Patent number: 6107515
    Abstract: A process for producing a methacrylic acid ester or an acrylic acid ester comprising: reacting methacrolein or acrolein with an alcohol or molecular oxygen in the presence of a catalyst comprising Pd; removing water with a separation membrane which can selectively permeate water from a mixed liquid of the alcohol and water.
    Type: Grant
    Filed: March 10, 1999
    Date of Patent: August 22, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Tatsuo Yamaguchi, Hiroshige Okamoto
  • Patent number: 6103830
    Abstract: A methacrylic resin having excellent impact resistance which is industrially more usable in general purposes, has the excellent weatherability and surface gloss inherent in methacrylic resins, and is optionally excellent in transparency and other properties. The impact-resistant methacrylic resin is characterized by being constituted of (A) a partially hydrogenated conjugated diene polymer having a degree of hydrogenation of from 20% to 70%, excluding 70%, and (B) a methacrylic copolymer formed from from 80 to 99.9% by weight-methyl methacrylate and from 0.1 to 20% by weight at least one other vinyl monomer-copolymerizable with the methyl methacrylate, and by having a toluene-insoluble content of from 0.5 to 50% by weight and a degree of swelling in toluene of from 2 to 12.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: August 15, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Satoru Hirota, Masahiro Sasagawa, Hideo Kinoshita
  • Patent number: 6100339
    Abstract: Disclosed is a curable resin which comprises at least one polymer selected from polymers each independently having a polymer chain represented by the following formula (I): ##STR1## wherein A to F are monomer units constituting a main chain of the polymer and are arranged in any order, and a to f are, respectively, wt % of A to F, based on the total weight of A to F; wherein each A is independently selected from cyclic olefin monomer units having no reactive group, each B is independently selected cyclic conjugated diene monomer units having no reactive group, each C to F is independently selected from comonomer units having no reactive group, and copolymerizable with A and B, wherein Q.sub.1 to Q.sub.6 are reactive groups, and wherein the average total number (J) of Q.sub.1 to Q.sub.6 of the at least one polymer satisfies: 1.ltoreq.(J).ltoreq.4, the polymer having an ME of from 1,000 to 5,000,000. A resin composition containing the curable resin is also disclosed.
    Type: Grant
    Filed: May 21, 1997
    Date of Patent: August 8, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Tomonari Watanabe, Itaru Natori
  • Patent number: 6099414
    Abstract: The present invention provides a golf club head comprising: a face section made of a low specific gravity metal not higher than 5; and a back face section made of a clad material in which the low specific gravity metal and a high specific gravity metal not lower than 7 are metallurgically bonded to each other in advance, wherein the low specific gravity metal of the face section and the low specific gravity metal of the clad material are integrally joined to each other by welding so as to form a club head. In this case, the methods of welding of TIG, plasma arc and laser beams are used in which a U-shaped and/or V-shaped groove is formed. In this golf club head, it is possible to improve the mechanical strength of the joint portion, and it is also possible to produce the golf club head in a short period of time.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: August 8, 2000
    Assignees: Nippon Steel Corporation, Fourteen Co., Ltd, Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Akihiko Kusano, Seiichi Soeda, Masaya Fukuda, Shigeru Chino, Takamitsu Takebayashi, Kenichi Miyazawa, Etsuji Kakimoto
  • Patent number: 6093760
    Abstract: A low volatility flame retardant for a styrene resin comprising an aromatic phosphate represented by formula (I): ##STR1## (I) wherein a, b, and c each independently represent an integer of 1-3; and R.sub.1, R.sub.2, R.sub.3 each independently represent a hydrogen atom or a halogen-free alkyl group having from 1 to 30 carbon atoms, which is not an isopropyl group, the total number of carbon atoms in the substituents represented by R.sub.1, R.sub.2 and R.sub.3 being from 12 to 25 on a average in one molecule of said aromatic phosphate.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: July 25, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hajime Nishihara, Susumu Tanji
  • Patent number: 6083428
    Abstract: The present invention provides a flame-retardant resin composition which comprises 100 parts by weight of a thermoplastic resin (A) and 0.1 to 30 parts by weight of one or more of organic phosphorus compounds (B) represented by the following formula (1) ##STR1## wherein X is ##STR2## R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent a phenyl group or a xylyl group with at least one being a phenyl group and at least one being a xylyl group, and n is a positive integer.The flame-retardant resin composition of the present invention is excellent in heat resistance, impact strength in the form of thin-walled moldings and blooming-free property on the surface of articles molded therefrom.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: July 4, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Eiji Ueda, Hideo Kasahara, Kazuhiro Matsubara, Tsutomu Katsumata
  • Patent number: 6082265
    Abstract: An electronic delay detonator comprises an electronic timer (100) and an electric detonator (200) fired by ignition of an ignition element. The timer includes an energy charging circuit (120) for storing electrical energy supplied from a power supply, a delay circuit (30) for counting a time period by using the electrical energy stored in the energy charging circuit to thereby output a trigger signal, and a switching circuit (140) for supplying the electrical energy stored in the energy charging circuit to the ignition element in response to the trigger signal. To an impact externally applied to the electronic delay detonator, a lower limit of an impact value in an induced detonation range of the electric detonator substantially overlaps with an upper limit of an impact value in a range in which the electronic timer is operable. Thus, no explosive remains misfired even in adverse use environments.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: July 4, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Midori Sakamoto, Masaaki Nishi, Kazuhiro Kurogi
  • Patent number: 6084260
    Abstract: An Si oxide film, an oriented paraelectric oxide thin film and an oriented ferroelectric thin film are laminated on an Si single crystal substrate having a region for a source and a drain. A conductor thin film is formed in a portion not covered with an insulating film. A laminated structure formed of the Si oxide film, the oriented paraelectric oxide thin film and the oriented ferroelectric thin film is used as a gate of a transistor. The Si oxide film functions as a carrier injection inhibiting layer.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: July 4, 2000
    Assignees: Asahi Kasei Kogyo Kabushiki Kaisha, Yasuo Tarui
    Inventors: Tadahiko Hirai, Yasuo Tarui
  • Patent number: 6084119
    Abstract: A process for producing acrylonitrile or methacrylonitrile, wherein a molybdenum compound, which is convertible to molybdenum oxide and not supported on a carrier is added to a fluidized bed reactor as an activator, in such a way that the ratio y of molybdenum atoms in the oxide catalyst represented by the formula:Mo.sub.y Bi.sub.p Fe.sub.q A.sub.a B.sub.b C.sub.c D.sub.d E.sub.e O.sub.fwill be maintained in the range of 1.02x to 1.12x (x=1.5p+q+a+c+1.5d+1.5e) during an ammoxydation reaction.
    Type: Grant
    Filed: September 8, 1998
    Date of Patent: July 4, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hideo Midorikawa, Ken Someya
  • Patent number: 6080882
    Abstract: Process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation at a temperature in the range of from 380 to 500.degree. C. in a fluidized-bed reactor containing a catalyst composition preheated to a temperature of not lower than 300.degree. C.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: June 27, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hideo Midorikawa, Naoki Sugiyama, Hidenori Hinago
  • Patent number: 6077908
    Abstract: A polyoxymethylene resin composition comprising (A) 100 parts by weight of a polyoxymethylene resin and (B) 0.01 to 10 parts by weight of a vinyl compound having a primary acid amide group and an acid imide group is provided. The composition is excellent in heat stability in molding and weatherability and suited for use as a molding material for electric and electronic parts and automotive parts.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: June 20, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventor: Shyuzi Yahiro
  • Patent number: 6077472
    Abstract: The purpose of the invention is to produce a shaped article having a uniform dull surface with less noticeable weld line and other surface detects. The injection molded synthetic resin article of the invention has a weld portion and is characterized in that the weld line on the surface of the injection molded article has a dent of no more than 2 .mu.m, the surface of the injection molded article is a dull surface with no more than 30% gloss, the general portion, the weld portion and the resin flow end portion of the surface of the injection molded article provide a uniform dull surface, said dull surface having such abrasion resistance that no visible flaws develops at a hardness of 2B and below in a pencil scratch test. Such molded article can be produced without post-molding paint application and yet it has practical utility, thus presenting a maximum economic advantage.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: June 20, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hiroshi Kataoka, Yuo Umei
  • Patent number: 6077983
    Abstract: A method for recovering the activity of a ruthenium catalyst which comprises a step of bringing a ruthenium catalyst decreased in activity by its use in hydrogenation of an unsaturated organic compound into contact with oxygen in a liquid phase, and a step of maintaining the catalyst at a hydrogen partial pressure lower than that at the hydrogenation and a temperature not lower than a temperature lower by 50.degree. C. than the hydrogenation temperature.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: June 20, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Mitsuji Ono, Masashi Nonaka