Mitsubishi Gas Chemical Company, Inc.

Mitsubishi Paper Mills Limited

Mitsubishi Gas Chemcail, Co., Inc.

Atsuo Kuramoto

Akitoshi Sugio

Shigetoshi Hiraishi

Sadao Morishita

Takao Kawaki

Isamu Masumoto

Hiroyuki Urabe

Yukiya Nakasato

Tatsuhiko Kurihara

Akio Hasebe

A condensate free from stickiness and exhibiting an excellent initial color-formability when used as color developer of pressure sensitive copying paper can be obtained by reacting p-hydroxybenzoic acid and one p-alkyl-substituted phenol or a mixture of two or more p-alkyl-substituted phenols with formaldehyde in the presence of an acid catalyst and then directly taking out the condensate into cold water without any procedure such as dehydration, concentration, etc.

Pressure sensitive copying paper

A method for recovering polyphenylene oxide having a high bulk density and a reduced content of fine particles from a solution of a polyphenylene oxide, which comprises adding a non-solvent composed of a lower alkyl alcohol and water to an aromatic solvent solution of a polyphenylene oxide substantially free from impurities to precipitate the polyphenylene oxide, the weight ratio of the aromatic solvent to the lower alkyl alcohol being from 1:1 to 1:2 and the weight ratio of the lower alkyl alcohol to water being from 1:0.005 to 1:0.1 in the precipitation system, and the addition of the non-solvent being controlled such that a liquid composition of the aromatic solvent, the lower alkyl alcohol and water forms a single phase; and recovering the precipitated polyphenylene oxide.

Method for recovering polyphenylene oxides

Growing community of inventors

Tokyo, Japan

Atsuo Kuramoto