Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Kabushiki Kaisha

Ps Japan Corporation

Takeshi Ikematsu

Yasuo Hattori

Ikuji Ohtani

Toshiharu Kawasaki

Kiyoshi Kawakami

Mitsuhiro Tanaka

Mitsutoshi Toyama

Yoshihiro Inoki

Hironori Suezawa

Hiroshi Shirai

The present invention provides a method for manufacturing a styrene-based polymer having the steps of continuously feeding raw materials into one end of two or more polymerization vessels connected in series; polymerizing a styrenic monomer in the coexistence of a (meth)acrylate ester monomer by using an organic radical generating agent as an initiator by a mass or solution polymerization method of continuous process; and continuously taking out a product from another end of the polymerization vessels, wherein polymerization conditions are controlled in ranges specified by the following items (a) and (b): (a) a composition of monomers to be fed is 60 to 97% by weight of a styrenic monomer(s) and 3 to 40% by weight of a (meth)acrylate ester monomer(s); and (b) a concentration of the (meth)acrylate ester monomer(s) at any part of the polymerization vessels exceeds 1% by weight based on total monomers at any time during the polymerization.

Styrene polymer resin and composition thereof

A process for producing a styrenic resin with a small content of low molecular weight components, comprising a continuous anionic polymerization process wherein a raw material system having the following composition (A) is continuously fed, either collectively or in a divided manner, from one end of a reactor tank R1 having a back mixing flow and the product system is continuously discharged from the other end of the reactor tank R1, the internal temperature of the reactor tank R1 being controlled to a range of 40-120&deg; C., the average proportion of styrene monomers to the sum total of the styrene monomers, hydrocarbon solvent and styrenic polymers present in the reactor tank R1 being controlled to less than 10 wt. %, and the resulting styrenic polymer solution being devolatilized and dried:

Process for producing styrene resin reduced in content of low-molecular ingredient

A butadiene polymer or a copolymer of butadiene with another conjugated diene having the following structural parameters and physical properties:

Crystalline trans-butadiene polymers

Growing community of inventors

Musashino, Japan

Takeshi Ikematsu