Daicel Chemical Industries, Ltd.

Akihiro Yabui

Yoshihiro Ohtsuka

Nobuyuki Watanabe

An epoxidized granular thermoplastic polymer which comprises a shell-like surface layer insoluble in toluene at 25&#xb0; C. is formed on the polymer, and a process for the production of the epoxidized granular thermoplastic polymer characterized in that the process comprises: the first step of epoxidizing a granular thermoplastic polymer in a water medium in the presence of an epoxidizing agent or the epoxidizing agent and a solvent for accelerating an epoxidation reaction and a phosphoric acid series compound; the second step of the washing with water, or the neutralization and washing with water of the epoxidized granular thermoplastic polymer; and the third step, if necessary, of removing the solvent for accelerating epoxidation reaction which may be used in the first step, as well as a process for the production of an epoxidized thermoplastic polymer, characterized in that under the condition in which thermoplastic polymer (A) in the solid-state is dispersed or suspended in water (B), the thermoplastic polymer (A) is epoxidized by a peroxide (C) with the dispersed or suspended state maintained.

Epoxidized thermoplastic polymers and processes for their production

A process for producing an epoxidized diene polymer includes: dispersing or suspending a diene polymer (C) having a ball-reduced particle size of 0.05-20 mm in a medium (A) in the presence of powder particles (B) insoluble in the medium (A), or in an aqueous medium in the presence of a phenol-based stabilizer and/or a phosphorus-based stabilizer; and epoxidizing the diene polymer (C) by an epoxidizing agent, therefore, problems associated with epoxidation performed by dissolving diene polymer in a solvent are eliminated; an economical method for epoxidizing, producing, and purifying a diene polymer (C) in a solid form is provided; and the epoxidized diene polymer having an excellent heat stability can be obtained.

Process for producing epoxidized diene polymer

A coated molding comprising a molding of a thermoplastic resin composition including a thermoplastic resin and an epoxidized diene based block copolymer, and a coating layer formed on a surface of the molding, the thermoplastic resin composition including a thermoplastic resin and an epoxidized diene based block copolymer obtained by epoxidizing a diene based block copolymer or a partially hydrogentated diene based block copolymer, wherein prior to epoxidizing, the diene based block copolymer or partially hydrogenated diene based block copolymer consists of a polymer block consisting of a vinyl aromatic hydrocarbon compound, and a polymer block consisting of a conjugate diene compound or a partially hydrogenated conjugate diene compound. The thus obtained coating layer is thereby firmly adhered to a molding of the thermoplastic resin composition.

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Ohtake, Japan

Akihiro Yabui