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:
Sep. 19, 1989
Filed:
May. 24, 1988
Applicant:
Inventors:
A Lee Stautzenberger, Corpus Christi, TX (US);
Ellen A Langford, Corpus Christi, TX (US);
Edward E Quick, Corpus Christi, TX (US);
Assignee:
Celanese Engineering Resins, Inc., Chatham, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560 78 ; 560 79 ; 560 99 ;
Abstract
Crude diphenyl phthalates, including isomeric mixtures thereof which are prepared by reacting mixtures of isophthalic and terephthalic acids with phenol, preferably in the presence of an organotitanate, organozirconate, or organostannate catalyst, are purified by dissolving the crude phthalate in an organic solvent, contacting the resulting solution with dilute aqueous alkali to neutralize the ester, separating the resulting oil and aqueous phases, and thereafter recovering from the oil phase a purified diaryl phthalate of reduced color and low acidity.