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:
May. 17, 1983
Filed:
Jun. 22, 1981
John R Campbell, Saratoga, NY (US);
Jerry C Lynch, Schenectady, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
An improved interfacial polycondensation polycarbonate process, the improvement comprising an initial equilibrated pH range of 11 to 13, a temperature range of 15.degree. to 40.degree. C., a carbonyl halide rate of addition of 0.03 to 0.3 moles per minute per mole of aromatic dihydroxy compound, and a chain stopper content of 0.02 to 0.05 moles per mole of aromatic dihydroxy compound. The resulting aromatic polycarbonate exhibits improved chemical and physical properties having a weight average molecular weight within a range of from about 25,000 to 65,000, and a monocarbonate content of less than about 400 parts per million.