Mitsubishi Chemical Corporation

Takashi Komaya

Masanori Yamamoto

Hiroto Ito

Hiroshi Hashizume

Haruhiko Kusaka

Teruhiko Ohara

Kazunao Kusano

Kazuki Wakabayashi

Katsunori Fukuda

Kentaro Uchino

Haruo Iiduka

A novel polycarbonate diol is useful as a raw material for producing a polycarbonate diol-based polyurethane with a high degree of hardness, superior abrasion resistance, and superior hydrophilicity. The polyurethane is useful in paints, coating agents, synthetic leathers, artificial leathers, and highly-functional elastomers, or the like. The polycarbonate diol is also useful for producing an active-energy radiation curable polymer composition giving a cured film having superior contamination resistance and high degree of hardness. The curable polymer composition contains a urethane(meth)acrylate oligomer obtained from the polycarbonate diol. The polycarbonate diol is obtained, for example, by reacting two specific types of diols with diester carbonate in the presence of a transesterification catalyst. The catalyst has a metal of Group 1 or 2 on the periodic table. A metal content of the transesterification catalyst is 100 weight ppm or less.

Polycarbonate diol and producing method thereof, and polyurethane and active energy ray-curable polymer composition both formed using same

A process for producing an aromatic carboxylic acid, which comprises oxidizing an alkylaromatic hydrocarbon with a molecular oxygen-containing gas in a liquid phase in an acetic acid solvent in the presence of catalyst components comprising cobalt, manganese and bromine, wherein (1) the reaction temperature is from 140.degree. to 180.degree. C., (2) the cobalt component is in an amount of from 400 to 3,000 ppm by weight to the acetic acid solvent, as calculated as cobalt metal, (3) the manganese component is in an amount of from 0.001 to 0.4 time in the atomic ratio to cobalt, (4) the bromine component is in an amount of from 0.1 to 5.0 times in the atomic ratio to cobalt, (5) a part of an oxidation exhaust gas obtained by removing condensable components by condensation from a gas withdrawn from the reactor, is recycled to a liquid phase in the reactor, and (6) the reaction pressure is adjusted to a level which is higher than the pressure for a case where air is used as the molecular oxygen-containing gas and no recycling of the oxidation exhaust gas is carried out.

Process for producing an aromatic carboxylic acid

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Chiyoda-ku, Japan

Takashi Komaya