Patents Assigned to Tokuyama Soda Kabushiki Kaisha
  • Patent number: 5513987
    Abstract: A denture having a layer of a soft relining material and a method of repairing denture. The denture has on the mucosa surface thereof the soft relining material which comprises a cured product of a composition that contains (A) 100 parts by weight of an organopolysiloxane having in a molecule thereof at least two organic groups with a terminal unsaturated bond, (B) an organohydrogenpolysiloxane having in a molecule thereof at least three hydrogen atoms bonded to silicon atoms, in such an amount that the number of said hydrogen atoms is 0.5 or greater per one unsaturated bond in the component (A), (C) a platinum catalyst in an amount of 0.1 to 1000 ppm reckoned as platinum atoms with respect to the total amount of the component (A) and the component (B), and (D) 5 to 300 parts by weight of a fine particle of a polyorganosilsesquioxane.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: May 7, 1996
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Yasuhiro Hosoi, Osamu Iwamoto, Masataka Himeno
  • Patent number: 5349065
    Abstract: A compound represented by the following general formula (II): ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a phenyl group, a benzyl group, a phenethyl group, an alkylamine group having 1 to 4 carbon atoms, or a dialkylamino group having 2 to 8 carbon atoms, and ##STR2## represents a nobornylidene group or bicyclo [3,3,1]9-nonylidene group which may have a substituent, and ##STR3## represents a pyridine, quinoline, pyrrole or benzothiophene group which may have a substituent.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: September 20, 1994
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Takashi Tanaka, Satoshi Imura, Kenji Tanaka, Yasuji Kida
  • Patent number: 5336477
    Abstract: There is provided a composite oxide represented by the formulaiR.sub.2 O.jAl.sub.2 O.sub.3.kTiO.sub.2.mSiO.sub.2.nH.sub.2 Owherein R denotes an alkali metal, i is 0.3 to 1, k is 0 to 0.9, j+k=1, m is 7 to 70 and n is 0.2 to 0.4, said composite oxide being amorphous, and its cumulative specific pore volume of pores having a pore radius of 10.sup.4 A or less being 2.0 to 3.0 cc/g. This composite oxide can be produced by a process which comprises a first reaction step of adding an acid aqueous solution capable of forming a silicate by reaction with an alkali silicate to 7 to 10% by weight, calculated as silica, of an alkali silicate aqueous solution in the presence of a salt at 10 to 45.degree. C. such that a neutralization ratio becomes 20 to 40%, and a second reaction step of heating the reaction solution obtained in the above reaction at temperature of 90.degree. C.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: August 9, 1994
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Yoshiaki Koga, Genji Taga
  • Patent number: 5330833
    Abstract: A tin oxide fiber expressed by the general formulaSn.sub.(1-y) Z.sub.y O.sub.2 (I)wherein Z is a metal element of the Group V of the periodic table, and y is 0 to 0.3, having a diameter which is greater than 1 .mu.m or having a length which is greater than 3 mm and having an aspect ratio which is greater than 10.This fiber is process for producing a tin oxide fiber comprising spinning an alcohol solution of a tin compound soluble in alcohol, or spinning an alcohol solution of said tin compound and a compound of a metal of the Group V of the periodic table that is soluble in alcohol, followed by heating.
    Type: Grant
    Filed: January 31, 1992
    Date of Patent: July 19, 1994
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Hiroya Yamashita, Keiko Seki, Sumio Sakka, Toshinobu Yoko
  • Patent number: 5262142
    Abstract: There is provided a composite oxide represented by the formulaiR.sub.2 O.jAl.sub.2 O.sub.3.kTiO.sub.2.mSiO.sub.2.nH.sub.2 Owherein R denotes an alkali metal, i is 0.3 to 1, k is 0 to 0.9, j+k=1, m is 7 to 70 and n is 0.2 to 0.4,said composite oxide being amorphous, and its cumulative specific pore volume of pores having a pore radius of 10.sup.4 A or less being 2.0 to 3.0 cc/g. This composite oxide can be produced by a process which comprises a first reaction step of adding an acid aqueous solution capable of forming a silicate by reaction with an alkali silicate to 7 to 10% by weight, calculated as silica, of an alkali silicate aqueous solution in the presence of a salt at 10.degree. to 45.degree. C. such that a neutralization ratio becomes 20 to 40%, and a second reaction step of heating the reaction solution obtained in the above reaction at a temperature of 90.degree. C.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: November 16, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Yoshiaki Koga, Genji Taga
  • Patent number: 5260476
    Abstract: There is provided a curable composition for dental restoration comprising a vinyl monomer containing not less than 30% by weight of an acid group-containing vinyl monomer represented by the formula ##STR1## wherein R.sup.1 's may be the same or different and each denotes a hydrogen atom or a methyl group, R.sup.2 denotes a trivalent to hexavalent organic residue having 1 to 30 carbon atoms which residue may have an ether linkage and/or an ester linkage, m is an integer of 2 to 4, n is an integer of 1 or 2,an ion dissolving filler that dissolves a polyvalent metallic ion, and a polymerization initiator. Said curable composition features that it shows high adhesion even under humidity, and its cured product has high strength and less coloration.
    Type: Grant
    Filed: August 19, 1992
    Date of Patent: November 9, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Hideki Ohno, Takesi Satou, Hidenori Okamoto
  • Patent number: 5242872
    Abstract: A process for producing a sintered body of aluminum nitride, which comprises mixing an aluminum nitride powder with (A) an alkaline earth metal aluminate, or both of (A-1) an oxide or oxide-forming compound of aluminum, and (A-2) an oxide or oxide-forming compound of an alkaline earth metal, and (B) an oxide or oxide-forming compound of yttrium or an element of the lanthanide series, and firing the resulting mixture.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: September 7, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Hitofumi Taniguchi, Nobuyuki Kuramoto
  • Patent number: 5240692
    Abstract: Disclosed is a novel basic magnesium carbonate represented by the following general formula:nMgCO.sub.3.Mg(OH).sub.2.mH.sub.2 Owherein n is a number of from 3 to 5 and m is a number of from 3 to 5,which consists of porous particles composed of an aggregate of plate crystals having an average particle size of 1 to 50 .mu.m and a specific surface area of 10 to 70 m.sup.2 /g, wherein in the fine pore size distribution of the particles, the volume of fine pores having a radius smaller than 100 .ANG. is at least 0.02 cc/g and the volume of fine pores having a radius smaller than 75,000 .ANG. is at least 0.8 cc/g.This novel basic magnesium carbonate is highly improved over conventional basic magnesium carbonate in such properties as filling property, dispersibility and flowability.
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: August 31, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventor: Tetsuhiko Morifuji
  • Patent number: 5238735
    Abstract: Disclosed is a microporous shaped polyolefin article comprising a polyolefin and synthetic resin particles dispersed therein and having a softening temperature or a decomposition temperature higher than the shaping temperature of the polyolefin resin, said article having a network structure composed of open-cellular pores with a maximum pore diameter of not more than 5 micromoters, having a porosity of 20 to 90% and being molecularly oriented by stretching. A process for its production is also provided.
    Type: Grant
    Filed: February 5, 1990
    Date of Patent: August 24, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Satoshi Nagou, Shunichi Nakamura, Takeshi Nishibayashi
  • Patent number: 5234894
    Abstract: A cyanoketone derivative of the following formula (1) ##STR1## wherein A.sub.1 is a substituted or unsubstituted phenyl or naphthyl group or a substituted or unsubstituted heterocyclic group;each of X.sub.1, X.sub.2 and X.sub.3 is independently an oxygen or sulfur atom;each of B.sub.1, B.sub.2 and B.sub.3 is independently a hydrogen atom or C.sub.1 -C.sub.6 -alkyl group;each of Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 is independently a hydrogen atom, a halogen atom or a C.sub.1 -C.sub.6 -alkyl group; andA.sub.2 is a substituted or unsubstituted group selected from the group consisting of a C.sub.1 -C.sub.6 -alkyl group, a C.sub.2 -C.sub.6 -alkenyl group, a C.sub.2 -C.sub.6 -alkynyl group, a C.sub.1 -C.sub.4 -alkoxy group, a C.sub.1 -C.sub.4 -alkylthio group, a C.sub.1 -C.sub.6 -alkoxycarbonyl group, an unsubstituted benzoyl group, a halogen-substituted benzoyl group, a cyano group or a group as defined in A.sub.1 ;provided that when B.sub.1 is a hydrogen atom and B.sub.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: August 10, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Masahiko Ishizaki, Seiji Nagata, Tadashi Kobutani
  • Patent number: 5221455
    Abstract: Disclosed is a bipolar membrane comprising a cation-exchange membrane in which a cation-exchange group present at least at its adhered surface has been ion-exchanged with a heavy metal ion, which is adhered closely to an anion-exchange membrane at a peel strength of not less than 0.2 kg f/25 mm, and having a water-splitting current efficiency of not less than 80% and a water-splitting membrane potential of not more than 2.0 V.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: June 22, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Fumio Hanada, Koki Hirayama, Nobuhiko Ohmura, Shinsuke Tanaka
  • Patent number: 5216953
    Abstract: A printing cylinder is disclosed which makes it possible to remove the ink adhering to the side surfaces of the printing cylinder after the printing has been finished without the need of moving the printing cylinder.
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: June 8, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventor: Kazuyuki Hada
  • Patent number: 5214116
    Abstract: There is provided a resin having a high refractive index. The resin is a polymer comprising units derived from a sulfur-containing unsaturated compound. The present invention also provides novel sulfur-containing unsaturated compounds which in useful in the production of the resin. Examples of these compounds include ##STR1## and CH.sub.2 .dbd.CCH.sub.3 COSCH.sub.2 CH.sub.2 SC.sub.3 H.sub.6 SCH.sub.3.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: May 25, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Singo Matsuoka, Masahiro Amano, Yasuji Kida
  • Patent number: 5206272
    Abstract: This invention relates to an impression material composition comprising an alginate and a gelling agent and being hardened in the presence of water, an unsaturated carboxylic acid polymer being contained in an amount of 5 to 150 parts by weight per 100 parts by weight of the alginate.
    Type: Grant
    Filed: June 18, 1991
    Date of Patent: April 27, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Sunao Urabe, Shouichi Narui
  • Patent number: 5182239
    Abstract: Aluminum nitride granules which are characterized in that (a) they are composed mainly of aluminum nitride, (b) their bulk density ranges from 0.5 to 1.5 g/cc, (c) the mean particle diameter thereof is within the range of 20 to 500 .mu.m, and (d) they have a breaking strength of 0.5 to 5.0 g. The aluminum nitride granules can be prepared by (1) mixing an aluminum nitride powder, a surfactant, a binder and an organic solvent, and optionally, at least one inorganic matter other than aluminum nitride, to form a slurry, (2) granulating the slurry, and (3) heating the resultant granulated particles to form the granules.
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: January 26, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Kiyofumi Hirokawa, Hitofumi Taniguchi
  • Patent number: 5171763
    Abstract: There is provided a curable composition for dental restoration comprising a vinyl monomer containing not less than 30% by weight of an acid group-containing vinyl monomer represented by the formula ##STR1## wherein R.sup.1 's may be the same or different and each denotes a hydrogen atom or a methyl group, R.sup.2 denotes a trivalent to hexavalent organic residue having 1 to 30 carbon atoms which residue may have an ether linkage and/or an ester linkage, m is an integer of 2 to 4, n is an integer of 1 or 2,an ion dissolving filler that dissolves a polyvalent metallic ion, and a polymerization initiator. Said curable composition features that it shows high adhesion even under humidity, and its cured product has high strength and less coloration.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: December 15, 1992
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Hideki Ohno, Takesi Satou, Hidenori Okamoto
  • Patent number: 5166107
    Abstract: Disclosed is a process for the preparation of an anorthite sintered body, which comprises preparing a formed body of at least one powder selected from the group consisting of (i) a calcium type zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio lower than 3, (ii) an amorphous calcination product obtained by calcining said calcium type zeolite and (iii) a mixture of said calcium type zeolite or said amorphous calcination product and an alkaline earth metal compound, and sintering the formed body at a temperature lower than 1000.degree. C.
    Type: Grant
    Filed: July 6, 1988
    Date of Patent: November 24, 1992
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Genji Taga, Masaki Noritake, Masami Enokuchi
  • Patent number: 5156498
    Abstract: A method for controlling a moisture content of a silica powder, which comprises contacting a fluid-flowing silica powder with a steam in a vessel, for example, a pipeline for transportation by air that connects a hopper for storing of a silica powder and a solid-gas separator, held at a temperature lower than a condensation temperature of the steam.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: October 20, 1992
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Hiroshi Nomura, Kohichi Yoshihara, Yoshio Mitani
  • Patent number: 5138001
    Abstract: Novel vinylphenyl compound which gives, as a copolymer with other vinyl compound copolymerizable therewith, a crosslinked polymer excellent in birefringence, transparency, heat resistance and moisture absorption resistance. The crosslinked polymer is advantageously useful as a disk substrate.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: August 11, 1992
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Masahide Ueda, Kanehiro Nakamura, Yoshifumi Matsumoto, Mari Kusaba
  • Patent number: 5130058
    Abstract: A photochromic compound represented by the following general formula [I] ##STR1## wherein ##STR2## represents a divalent aromatic hydrocarbon group or a divalent heterocyclic group each of which may have a substituent,R.sub.1 represents a monovalent hydrocarbon group or a monovalent heterocyclic group each of which may have a substituent, ##STR3## represents a norbornylidene or adamantylidene group which may have a substituent,X represents an oxygen atom or a group of the formula >N--R.sub.3 in which R.sub.3 represents a hydrogen atom or a hydrocarbon group which may have a substituent, andR.sub.2 represents a monovalent hydrocarbon group which may have a substituent.Also provided are a process for production of the photochromic compound, a composition containing the photochromic compound, and the use of the photochromic compound. The colored form of this photochromic compound has excellent thermal stability.
    Type: Grant
    Filed: June 29, 1989
    Date of Patent: July 14, 1992
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Takashi Tanaka, Kenji Tanaka, Satoshi Imura, Yasuji Kida