Mitsui Toatsu Chemicals, Incorporated

Nippon Petrochemicals Company, Limited

Nippon Oil Company

Kazuo Miyazaki

Moritsugu Morita

Akihiro Yamaguchi

Masahiro Ohta

Shoji Tamai

Yoshihiko Araki

Hajime Hara

Atsushi Kaiya

Hideo Horii

Kunio Nishihara

Hideo Kawaguchi

Nobuyuki Takizawa

Eizo Arai

Kojiro Teramoto

Shoji Iida

Humiaki Oshimi

A method for continuously producing a liquid low molecular weight polymer of conjugated diolefin having a number average molecular weight of 300 to 10000. The method comprises the step of continuously polymerizing or copolymerizing conjugated diolefin in an inert hydrocarbon solvent at a temperature of 40.degree. to 70.degree. C. with maintaining the quantity of dissolved oxygen in the reaction system at 1 ppm or below and in the presence of a polymerization catalyst of an organic sodium compound and a chain transfer agent of an alkylaryl compound.

Method for continuously producing low molecular weight polymer of

Flexible laminate printed-circuit board and methods of making same

Process for the correction of curls of flexible metal clad laminate and

In a method for purifying a crude epoxidation product of a liquid conjugated diolefin polymer or a vegetable oil which comprises the steps of adding an aqueous washing agent to a crude epoxidation product which is obtained by the reaction of a liquid conjugated diolefin polymer or a vegetable oil with an organic peracid or an epoxidizing agent capable of generating an organic peracid in situ, stirring the mixture, leaving the mixture to stand to induce phase separation and thereafter withdrawing the organic layer, the improvement wherein 50 to 300 parts by weight, per 100 parts by weight of the crude epoxidation product, of a 10-80% by weight aqueous solution of isopropanol is used as the washing agent.

Method for purifying an epoxidation product

A method for recovering a low molecular weight polymer containing no catalyst residue, which method comprises the steps of: polymerizing a conjugated diolefin or copolymerizing comonomers of conjugated diolefins and a vinyl compound having anionic polymerization activity in the presence of a catalyst containing an organic sodium compound and a chain transfer agent of an alkyl aryl compound; uniformly mixing the obtained polymerization mixture with an isopropyl alcohol aqueous solution; separating the thus obtained mixture into two phases of a polymer mixture containing the liquid low molecular weight polymer and an isopropyl alcohol aqueous solution containing catalyst residue; and separating the low molecular weight polymer from the polymer mixture.

Method for recovering low molecular weight polymers

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Yokohama, Japan

Kazuo Miyazaki