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:
Nov. 05, 2002
Filed:
Nov. 13, 2001
Applicant:
Inventors:
Assignee:
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G 6/400 ;
U.S. Cl.
CPC ...
C08G 6/400 ;
Abstract
The invention relates to an inexpensive and simple method for producing a starting material for polycarbonate resin and for producing polycarbonate resin. In the method for producing a starting material for polycarbonate resin production through interfacial polymerization, (I) a molten bisphenol compound is mixed and dissolved in an aqueous alkali solution at 20 to 80° C., or (II) it is, without being solidified, directly mixed with water to be in liquid at a temperature not higher than the melting point of the bisphenol compound, and then dissolved in an aqueous alkali solution.