The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 2010
Filed:
May. 22, 2007
Toshiyuki Hamano, Mie, JP;
Ryuuji Uchimura, Fukuoka, JP;
Kazuyuki Takahashi, Kitakyushu, JP;
Masaaki Miyamoto, Fukuoka, JP;
Toshiyuki Hamano, Mie, JP;
Ryuuji Uchimura, Fukuoka, JP;
Kazuyuki Takahashi, Kitakyushu, JP;
Masaaki Miyamoto, Fukuoka, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
The object of the present invention is to provide a production method of a high molecular weight aromatic polycarbonate containing a reduced amount of a high melting point product, and having less thermal history received and excellent hue by a melt process. The present invention relates to a production method of an aromatic polycarbonate, characterized in that in producing an aromatic polycarbonate using an aromatic dihydroxy compound and a carbonic diester as raw materials and using plural reactors, a molten reactant temperature T(° C.) in at least one reactor A and a molten reactant temperature T(° C.) in a reactor B subsequent to the reactor A are satisfied with the relationship of TT, and an evaporation surface area per unit treatment amount of a molten reactant in the reactor to which a molten reactant having a limiting viscosity of 0.1 dl/g or more is supplied is 1.0 m·hr/mor more.