Mitsubishi Chemical Industries Limited

Mitsubishi Kasei Corporation

Tsuneo Kimura

Hiroshi Hashizume

Katsuhisa Kohyama

Yoshiaki Izumisawa

Akira Utsunomiya

Katsuyuki Sakata

Tsugio Kaneko

Michihiro Ikeda

Teruo Kidera

Yuka Ohno

Katsuhisa Koyama

Takehiro Okada

Yukio Kajiwara

A process for producing a ceramic preform, which comprises mixing an alkoxysilane and fine silica powder, molding the mixture, followed by heating for de-alcoholysis.

Process for producing a ceramic preform

An aqueous dispersion of silicic anhydride, comprising an aqueous solvent and silicic anhydride dispersed therein, wherein the silicic anhydride has a surfacial silanol group density of from 0.3 to 3 per 100 .ANG..sup.2 and is obtained by the surface treatment of silicic anhydride produced by a dry method.

Aqueous dispersion of silicic anhydride and abrasive composition

A polyester is produced in an improved process by esterification or interesterification of an aromatic dicarboxylic acid or an alkyl ester thereof with 1,4-butanediol followed by polycondensation of the resulting ester characterized in reusing the 1,4-dibutanediol mixture distilled in the polycondensation step without purification as a starting material for production of more polyester.

Process for producing polyester

A purified terephthalic acid is prepared by dissolving a crude terephthalic acid in water at high temperature under high pressure and then contacting the resulting aqueous solution with a catalyst of an active carbon supporting palladium under maintaining the pressure P(kg/cm.sup.2) of the gaseous phase in the catalytic contacting zone in a range of

Process for preparing purified terephthalic acid

A process for the continuous preparation of pure terephthalic acid by oxidation of p-xylene with molecular oxygen in acetic acid solvent comprising conducting the oxidation at a temperature of 205.degree. to 230.degree. C. in the presence of an oxidation catalyst comprising (a) a cobalt compound in an amount of at least 120 ppm and less than 200 ppm as cobalt based on the weight of solvent, (b) a manganese compound sufficient to provide a manganese to cobalt weight ratio of 0.5 to 1.5 and (c) a bromine compound selected from hydrogen bromide, cobalt bromide and manganese bromide in an amount of 200 to 1,000 ppm as bromine based on the weight of solvent, while the water content of the liquid phase of the reaction system is kept at 4 to 14 percent by weight.

Process for preparing terephthalic acid

There is disclosed a process for producing terephthalic acid in which the reaction temperature range and the proportion of catalyst components of a cobalt compound, a manganese compound and at least one bromine compound are specifically chosen to produce a high grade terephthalic acid suitable for direct polycondensation in the production of polyester.

Process for producing terephthalic acid

Flame resistance is imparted to polyamide resins by the process which comprises melting said polyamide at a temperature between the softening point of the polyamide and 250.degree.C, and adding a flameproofing quantity of a flameproofing agent to said melt, and thereafter solidifying said melt whereby said polyamide is flameproofed to an extent of UL-94, said flame proofing agent being selected from the group consisting of ##EQU1## wherein R is the same or different and represents hydrogen or lower alkyl, formamide and mixtures thereof.

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Kitakyushu, Japan

Tsuneo Kimura