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:
Mar. 18, 1980
Filed:
Jan. 25, 1979
Applicant:
Inventors:
Josefina T Baker, Cupertino, CA (US);
Robert S Cooke, Morris Plains, NJ (US);
Stylianos Sifniades, Madison, NJ (US);
Assignee:
Allied Chemical Corporation, Morristown, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528182 ; 528194 ; 528196 ; 528199 ;
Abstract
A process for poly(ester-carbonates) from dihydric phenols, especially bisphenol A; aromatic or cycloaliphatic dicarboxylic acids, especially terephthalic acid; and phosgene as carbonate precursor wherein a reaction of the acid and phosgene is carried out in a first stage forming dicarboxylic acid chloride; and then phosgene and bisphenol A are added in separate streams, simultaneously during most of the second or condensation stage. Thereby only one kettle is required for carrying out the complete polymer production.