Toyo Soda Manufacturing Co., Ltd.

Tosoh Corporation

Akio Kiyohara

Yasushi Sakai

Michio Saito

Koji Tanaka

Hiroshi Kaneko

Tetsuo Fujii

Motoaki Munekata

Tooru Iwashita

Tetsuya Asahi

A process for producing a light color high softening point hydrocarbon resin, which comprises polymerizing an oil fraction obtained by condensing a fractionated component withdrawn in a gas phase from a recovery section of a fractionating tower located below the feeding section and above the bottom of the tower during the fractional distillation in the tower of a feed oil fraction having a boiling point within a range of from 140.degree. to 280.degree. C. selected among cracked oil fractions obtained by thermal cracking of petroleum.

Process for producing a light color high softening point hydrocarbon

A process for producing a hydrocarbon resin which comprises polymerizing, by means of a Friedel-Crafts catalyst, a mixture of (1) a residual fraction obtained by polymerizing a fraction of a boiling point range of from 140.degree. to 280.degree. C. obtained from the decomposition of a petroleum and containing unsaturated hydrocarbons and removing the resulting polymer and (2) phenol and/or a phenol derivative.

Process for producing a hydrocarbon resin

A method of preventing the scale from sticking wherein, upon the polymerization of vinyl type monomers in aqueous medium, reaction products of liquid polybutadiene with phenolic compounds or reaction products between thermoplastic resin gathered from the stumps of pine, phenolic compounds and, if desired, aldehyde compounds are coated beforehand onto the inside face of polymerization vessel, and a preventive agent of scale from sticking are disclosed.

Method of polymerizing vinyl monomers with coated reactor

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Yokkaichi, Japan

Akio Kiyohara