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:
Oct. 08, 1985
Filed:
Aug. 17, 1984
Larry L Chandler, Greensboro, NC (US);
Thurston R Friar, Jamestown, NC (US);
Berwyn W Green, Greensboro, NC (US);
Foam Systems Company, Riverside, CA (US);
Abstract
The process of the present invention reacts a polyhydric alcohol and a second reactant selected from the group consisting of polycarboxylic acid, anhydride or an ester of a polycarboxylic acid in a first reactor to produce a flowable intermediate ester. During this reaction, volatile by-product is removed. The flowable intermediate ester is transferred to a holding vessel from which it is metered to a second reactor. Additional polyhydric alcohol may be added to the flowable intermediate ester which may be preheated by heat exchange with the finished polyester before introduction to the second reactor. A polyalkylene terephthalate feed is introduced to the second reactor in which it is reacted to form a finished polyester which is continuously removed from the second reactor. By altering the feeds to the second reactor, the physical characteristics of the finished polyester may be changed to meet various specifications.