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. 16, 1985
Filed:
Aug. 03, 1984
Applicant:
Inventor:
Sarah M Glass, Richwood, TX (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528196 ; 528198 ; 528199 ;
Abstract
An interfacial process for the preparation of polycarbonates having improved optical properties is disclosed wherein dihydric phenols are reacted with phosgene in the presence of an aqueous alkali solution and an organic solvent. After the polycarbonate oligomers are formed, the reaction mixture is diluted with additional solvent (25 to 125 volume percent). A polymerization catalyst such as triethylamine is then added to generate high molecular polycarbonates and the resins are then recovered.