Mitsubishi Chemical Industries Limited

Kenji Tsuruhara

Katsuhisa Kohyama

Akira Matsuno

Teruo Kidera

A process for producing polycarbonate resin particles from a methylene chloride solution of a polycarbonate resin obtained by the polycondensation of a dihydroxydiaryl compound and phosgene, which comprises continuously supplying the methylene chloride solution of the polycarbonate resin to a particle-forming vessel, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form an aqueous slurry containing polycarbonate resin particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming vessel and containing the polycarbonate resin particles to wet pulverization treatment and recycling at least a part of the treated polycarbonate resin particles to the particle-forming vessel.

Process for producing polycarbonate resin particles

A process for producing aromatic polyester polycarbonate particles from a methylene chloride solution of an aromatic polyester polycarbonate comprises continuously supplying the methylene chloride solution of an aromatic polyester polycarbonate to a particle-forming tank, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form aromatic polyester polycarbonate particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming tank and containing the aromatic polyester polycarbonate particles to wet pulverization treatment and recycling the treated slurry to the particle-forming tank.

Growing community of inventors

Kitakyushu, Japan

Kenji Tsuruhara