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:
Jan. 03, 1978
Filed:
Oct. 26, 1976
Michael M Besso, West Orange, NJ (US);
Lowell Saferstein, Edison, NJ (US);
Celanese Corporation, New York, NY (US);
Abstract
The present invention relates to a process for preparing certain halogenated aromatic polyesters by an inverse interfacial polymerization technique. More specifically, the present invention offers a method for substantially reducing the amount of low molecular weight fraction which accompanies the formation of these polyesters when prepared by standard interfacial polymerization techniques by (1) inverting the order of addition of one phase to the other, i.e. by adding the aqueous phase to the organic phase, (2) controlling the rate of addition of the aqueous phase to the organic phase and (3) adding the catalyst to the organic phase prior to the addition of the aqueous phase thereto.