Patents Assigned to Tokuyama Soda Kabushiki Kaisha
-
Patent number: 5513987Abstract: 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: GrantFiled: March 8, 1994Date of Patent: May 7, 1996Assignee: Tokuyama Soda Kabushiki KaishaInventors: Yasuhiro Hosoi, Osamu Iwamoto, Masataka Himeno
-
Patent number: 5349065Abstract: 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: GrantFiled: November 17, 1992Date of Patent: September 20, 1994Assignee: Tokuyama Soda Kabushiki KaishaInventors: Takashi Tanaka, Satoshi Imura, Kenji Tanaka, Yasuji Kida
-
Patent number: 5336477Abstract: 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: GrantFiled: May 26, 1993Date of Patent: August 9, 1994Assignee: Tokuyama Soda Kabushiki KaishaInventors: Yoshiaki Koga, Genji Taga
-
Patent number: 5330833Abstract: 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: GrantFiled: January 31, 1992Date of Patent: July 19, 1994Assignee: Tokuyama Soda Kabushiki KaishaInventors: Hiroya Yamashita, Keiko Seki, Sumio Sakka, Toshinobu Yoko
-
Patent number: 5262142Abstract: 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: GrantFiled: July 31, 1992Date of Patent: November 16, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Yoshiaki Koga, Genji Taga
-
Patent number: 5260476Abstract: 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: GrantFiled: August 19, 1992Date of Patent: November 9, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Hideki Ohno, Takesi Satou, Hidenori Okamoto
-
Patent number: 5242872Abstract: 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: GrantFiled: June 28, 1991Date of Patent: September 7, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Hitofumi Taniguchi, Nobuyuki Kuramoto
-
Patent number: 5240692Abstract: 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: GrantFiled: August 17, 1992Date of Patent: August 31, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventor: Tetsuhiko Morifuji
-
Patent number: 5238735Abstract: 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: GrantFiled: February 5, 1990Date of Patent: August 24, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Satoshi Nagou, Shunichi Nakamura, Takeshi Nishibayashi
-
Patent number: 5234894Abstract: 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: GrantFiled: March 27, 1992Date of Patent: August 10, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Masahiko Ishizaki, Seiji Nagata, Tadashi Kobutani
-
Patent number: 5221455Abstract: 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: GrantFiled: May 31, 1991Date of Patent: June 22, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Fumio Hanada, Koki Hirayama, Nobuhiko Ohmura, Shinsuke Tanaka
-
Patent number: 5216953Abstract: 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: GrantFiled: June 9, 1992Date of Patent: June 8, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventor: Kazuyuki Hada
-
Patent number: 5214116Abstract: 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: GrantFiled: December 11, 1991Date of Patent: May 25, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Singo Matsuoka, Masahiro Amano, Yasuji Kida
-
Patent number: 5206272Abstract: 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: GrantFiled: June 18, 1991Date of Patent: April 27, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Sunao Urabe, Shouichi Narui
-
Patent number: 5182239Abstract: 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: GrantFiled: June 13, 1991Date of Patent: January 26, 1993Assignee: Tokuyama Soda Kabushiki KaishaInventors: Kiyofumi Hirokawa, Hitofumi Taniguchi
-
Patent number: 5171763Abstract: 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: GrantFiled: December 10, 1991Date of Patent: December 15, 1992Assignee: Tokuyama Soda Kabushiki KaishaInventors: Hideki Ohno, Takesi Satou, Hidenori Okamoto
-
Patent number: 5166107Abstract: 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: GrantFiled: July 6, 1988Date of Patent: November 24, 1992Assignee: Tokuyama Soda Kabushiki KaishaInventors: Genji Taga, Masaki Noritake, Masami Enokuchi
-
Patent number: 5156498Abstract: 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: GrantFiled: April 2, 1991Date of Patent: October 20, 1992Assignee: Tokuyama Soda Kabushiki KaishaInventors: Hiroshi Nomura, Kohichi Yoshihara, Yoshio Mitani
-
Patent number: 5138001Abstract: 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: GrantFiled: August 27, 1990Date of Patent: August 11, 1992Assignee: Tokuyama Soda Kabushiki KaishaInventors: Masahide Ueda, Kanehiro Nakamura, Yoshifumi Matsumoto, Mari Kusaba
-
Patent number: 5130058Abstract: 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: GrantFiled: June 29, 1989Date of Patent: July 14, 1992Assignee: Tokuyama Soda Kabushiki KaishaInventors: Takashi Tanaka, Kenji Tanaka, Satoshi Imura, Yasuji Kida