Mitsubishi Chemical Industries Limited

Mitsubishi Kasei Corporation

Yoshiaki Ohtani

Hironori Hayashida

Yoshitomi Urabe

Katsuyuki Sakata

Mitsuhiko Tamura

Shinichiro Koga

Akira Matsuno

Haruo Katsumata

Isao Akihara

Kiyoharu Urakawa

This invention provides a polycarbonate resin composition for optical use and an optical disc substrate manufactured therefrom. Polycarbonate resin is mixed with at least one kind of carboxylic acid selected from aliphatic carboxylic acids having 1 to 10 carbon atoms in which hydrogen atoms of aliphatic group may be substituted by hydroxyl groups; or aromatic carboxylic acids in which hydrogen atoms of the aromatic ring may be substituted by low alkyl groups, hydroxyl groups, or halogen atoms. The amount of the carboxylic acids is 5 to 1000 ppm based on the polycarbonate resin.

Polycarbonate resin composition for optical use

Disclosed herein is a process for producing a resin having carbonate bonding, comprising polymerizing a hydroxydiaryl compound and phosgene in an organic solvent of methylene chloride such that the concentration of carbon tetrachloride in phosgene and methylene chloride in the polymerization system satisfies the following equation:

Preparation with controlled amounts of polycarbonate carbon tetrachloride

The present invention relates to a process for preparing a 2-(1-hydroxyalkyl)cyclohexanone and/or a 2-alkylidene cyclohexanone. According to the present invention, the reaction of cyclohexanone with an aliphatic aldehyde is conducted in a heterogeneous system of an oil-in-water emulsion, whereby it is possible to obtain the 2-(1-hydroxyalkyl)cyclohexanone and/or the 2-alkylidene cyclohexanone in high selectivity.

Process for preparing 2-(1-hydroxyalkyl) cyclohexanone and/or

Growing community of inventors

Nakama, Japan

Yoshiaki Ohtani