公开(公告)号：JPH01157467A

公开(公告)日：1989-06-20

申请号：JP2371988

申请日：1988-02-05

Applicant: UBE INDUSTRIES

Inventor： KAMITOKU YASUHIKO ,  SHIMAMURA TSUNEO ,  FUJITA TOSHIHIRO

IPC: C01B21/068 ,  C04B35/58 ,  C04B35/626

Abstract: PURPOSE:To obtain the title powder excellent in sinterability and moldability by blending Si3N4 powder consisting of fine particles, middle particles and coarse particles at a prescribed rate. CONSTITUTION:For example, both silicon halide such as SiCl4 and a nitrogencontg. compd. such as NH3 are allowed to react with each other in a liquid phase and produced silicon diimide is thermally decomposed to obtain amorphous Si3N4. Then this is utilized as a raw material and one part thereof is calcined and both this calcined powder and the residual amorphous Si3N4 are uniformly mixed with a vibration mill, etc., and thereafter the mixture is calcined to obtain Si3N4 powder. Then this powder is separated into coarse particles having 0.50-3.0mu mean particle diameter, middle particles having 0.15-0.50mu mean particle diameter and fine particles having 0.05-0.15mu mean particle diameter obtained by pulverizing the middle particles in accordance with necessity and these are blended so as to be regulated to the rate within slanting lines shown in a triangular diagram.

公开(公告)号：JPH01122962A

公开(公告)日：1989-05-16

申请号：JP27904587

申请日：1987-11-06

Applicant: UBE INDUSTRIES

Inventor： NISHIDA AKIO ,  SHIMAMURA TSUNEO

IPC: C04B35/053

Abstract: PURPOSE:To produce the above sintered material having excellent hydration resistance and mechanical properties, by forming a powdery mixture of magnesia powder having uniform coating film of silica and granular zirconia powder and sintering the formed product. CONSTITUTION:Magnesia powder having a purity of >=99.9% and a specific surface area of >=5m /g and composed of primary particles of regular system is introduced into a fluidized layer reactor together with vapor of an organic silicate compound and the silicate compound is subjected to thermal decomposition and/or hydrolysis on the surface of the particle to obtain magnesia powder (A) having uniform coating film of silica having a purity of >=99.9% on the surface of the particle. A powdery mixture composed of 77-99wt.% of the component A and (B) 30-1wt.% of granular zirconia powder having a purity of >=99.9% and a specific surface area of >=5m /g is formed and the obtained formed article is sintered at 1,200-1,850 deg.C to obtain a sintered magnesia having a porosity of >=1% and composed of 70-99wt.% of magnesia particles having a particle diameter of

公开(公告)号：JPS56118061A

公开(公告)日：1981-09-16

申请号：JP2163780

申请日：1980-02-25

Applicant: UBE INDUSTRIES

Inventor： MIKAMI ICHIROU ,  USHIMI KATSUHIKO ,  NAKAGAWA KANJI ,  SHIMAMURA TSUNEO

IPC: C07D209/48 ,  C07D405/14 ,  C08F26/00 ,  C08F26/06 ,  C08G59/00 ,  C08G59/26 ,  C08G59/28 ,  C08G59/50

Abstract: NEW MATERIAL:A biphenyltetracarboxylic acid diimide compound of formula I (R is allyl or glycidyl) or formula II. EXAMPLE:N,N'-Diallyl-3,3',4,4'-biphenyltetracarboxylic acid diimide. USE:Raw material of heat-resistant cured product. It can be cured with a conventional epoxidization curing agent or crosslinking agent, and gives a cured product having excellent heat resistance. A material obtained by melting and quenching the diimide compound having glycidyl group can be compounded uniformly with a curing agent at a low temperature. PROCESS:The compound of formula I or formula II wherein R is allyl is obtained by heating a solution of an amic acid prepared by reacting biphenyltetracarboxylic acid with allylamine. Oxidation and subsequent epoxidization of the above compound affords the compound of formula I or formula II wherein R is glycidyl.

公开(公告)号：JPH04297444A

公开(公告)日：1992-10-21

申请号：JP13237591

申请日：1991-03-26

Applicant: UBE INDUSTRIES

Inventor： SHIMAMURA TSUNEO ,  FUJIZU SATORU ,  TOYAHARA YOSHINOBU

IPC: B01J27/10 ,  B01J27/13 ,  B01J27/24 ,  B01J31/26 ,  C07B61/00 ,  C07C68/00 ,  C07C69/96

Abstract: PURPOSE:To stably obtain a carbonic acid diester in high selectivity and yield by subjecting CO to vapor phase reaction with a nitrite under mild conditions using a solid catalyst consisting of a platinum group, metal group of iron, copper, etc., metal group of V, W, etc., and chloride of alkali (earth) metal. CONSTITUTION:Carbon monoxide is subjected to vapor phase reaction with a nitrite (particularly, methyl nitrite or ethyl nitrite) using a solid catalyst obtained by supporting a platinum group metal such as Pd or Pt or compound thereof as the primary catalyst component, compound of a metal selected from iron, copper, Bi, Co, Ni and tin as the secondary catalyst compound, a compound of metal selected from V, Mo and W as the tertiary catalyst component and chloride (e.g. NaCl or NaK) of alkali metal as the forth component on the support to provide carbonic acid diester (e.g. dimethyl carbonate). The above-mentioned reaction can be stably carried out under mild conditions in high selectivity and yield without accompanying danger in the operation by subjecting the above-mentioned component to vapor phase reaction under low temperature and pressure using the above-mentioned catalyst. Separation of catalyst is made unnecessary and metal thereof is not eluted, because the reaction is carried out in vapor phase. Therefore, the above-mentioned method is a industrially advantageous method.

公开(公告)号：JPH04290849A

公开(公告)日：1992-10-15

申请号：JP12883391

申请日：1991-03-15

Applicant: UBE INDUSTRIES

Inventor： SHIMAMURA TSUNEO ,  FUJIZU SATORU ,  TORIYAHARA YOSHINOBU

IPC: B01J31/18 ,  C07B61/00 ,  C07C68/00 ,  C07C69/96

Abstract: PURPOSE:To obtain a carbonic acid diester in high selectivity and yield by the vapor-phase catalytic reaction of CO with a nitrous acid ester under mild condition in the presence of a catalyst produced by supporting palladium tetraammine molybdate and a compound of a metal selected from Fe, Cu, Bi, Co, Ni and Sn on a carrier. CONSTITUTION:A carbonic acid diester is produced by the vapor-phase catalytic reaction of carbon monoxide with a nitrous acid ester using a solid catalyst produced by supporting (A) a catalyst consisting of palladium tetraammine molybdate prepared e.g. by reacting a palladium salt with a molybdic acid salt in an ammoniacal aqueous solution and (B) a cocatalyst consisting of a compound of a metal selected from Fe, Cu, Bi, Co, Ni and Sn on a carrier. The carbonic acid diester can stably be produced in high selectivity and yield at low temperature under low pressure by the use of the above solid catalyst and the process is advantageous for industrial use.

公开(公告)号：JPH04139152A

公开(公告)日：1992-05-13

申请号：JP25704290

申请日：1990-09-28

Applicant: UBE INDUSTRIES

Inventor： MATSUZAKI TOKUO ,  SHIMAMURA TSUNEO ,  FUJIZU SATORU ,  TOYAHARA YOSHINOBU

IPC: B01J23/648 ,  B01J23/64 ,  B01J23/652 ,  B01J23/89 ,  C07B61/00 ,  C07C68/00 ,  C07C69/96

Abstract: PURPOSE:To safely obtain the subject compound in high selectivity and yield under a mild condition by reacting CO with a nitrite ester in a gaseous phase in the presence of a solid catalyst whose activity is stable for a long period and which is prepared by carrying a three component compound such as Pt-Fe-V compound on a carrier. CONSTITUTION:CO is reacted with a nitrite ester such as methyl nitrite in the presence of a solid catalyst at 0-200 deg.C under the ordinary atmospheric pressure at a gas space rate of 500-20000hr in a gaseous phase to prepare the objective compound useful as a raw material for synthesizing medicines, agricultural chemicals, etc. The solid catalyst has a composition of the formula which is prepared by carrying (the first catalyst component) a platinum group metal or a compound thereof such as PdCl2, (the second component) the compound of a metal selected from copper, iron, bismuth, cobalt, nickel and tin, such as cupric chloride, and (the third catalyst component) the compound of a metal selected from molybdenum, vanadium and tungsten, such as ammonium molybdenate, on a carrier such as active carbon.

公开(公告)号：JPH01201065A

公开(公告)日：1989-08-14

申请号：JP29168187

申请日：1987-11-20

Applicant: UBE INDUSTRIES

Inventor： NISHIDA AKIO ,  SHIMAMURA TSUNEO ,  KUBOI YOUJI

IPC: C04B35/04

Abstract: PURPOSE:To improve mechanical properties is adding zirconia to magnesia and sintering, by specifying particle diameter and ratio of both the particles and making porosity of high-strength magnesia sintered material =5m /g specific surface area and 0.1-30wt.% granular zirconia powder having /g specific surface area and sintering the molded article at >=1,400 deg.C.

公开(公告)号：JPS598292B2

公开(公告)日：1984-02-23

申请号：JP13125076

申请日：1976-11-02

Applicant: Ube Industries

Inventor： NAKAMURA ASUMARU ,  MAKINO HIROSHI ,  SHIMAMURA TSUNEO ,  HARADA TAKASHI

IPC: C08G65/00 ,  C08G65/44 ,  C08G65/46 ,  C08G65/48

公开(公告)号：JPH0672042B2

公开(公告)日：1994-09-14

申请号：JP29168187

申请日：1987-11-20

Applicant: UBE INDUSTRIES

Inventor： NISHIDA AKIO ,  SHIMAMURA TSUNEO ,  KUBOI YOJI

IPC: C04B35/04

公开(公告)号：JPH04130006A

公开(公告)日：1992-05-01

申请号：JP25009290

申请日：1990-09-21

Applicant: UBE INDUSTRIES

Inventor： KAMITOKU YASUHIKO ,  SHIMAMURA TSUNEO ,  KITA TAKESHI

IPC: C01B21/082

Abstract: PURPOSE:To uniformly combine components in powder and to obtain silicon carbonitride at a low cost by heat-treating a mixture of powder of a nitrogen- contg. silane compd. and/or amorphous silicon nitride with an aliphatic compd. and/or an arom. compd. under specified conditions. CONSTITUTION:A mixture of powder of a nitrogen-contg. silane compd. and/or amorphous silicon nitride with polyhydric phenol is heat-treated at 1,450-1,900 deg.C in an inert gaseous atmosphere. By this heat treatment, carbon is formed from the phenol and crystalline silicon nitride from the powder. The carbon reacts with the silicon nitride to form silicon carbide. The resulting silicon carbonitride is fine powder of silicon carbide and silicon nitride combined on a particle level and is suitable for use as starting material for a sintered body having high strength at high temp.