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:
Jul. 04, 2000
Filed:
Mar. 30, 1999
Daniel Joseph Brunelle, Burnt Hills, NY (US);
Taeseok Jang, Troy, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Polyesters such as poly(1,4-cyclohexanedimethyl-1,4-cyclohexanedicarboxylate) are prepared by the reaction of at least one relatively non-volatile diol, preferably 1,4-cyclohexanedimethanol, with a 1,4-cyclohexanedicarboxylic acid ester in the presence of a catalyst such as a tetraalkyl titanate. Maximum molecular weight and crystallinity are provided by at least one of two options: conducting the reaction at a series of progressively increasing temperatures below 265.degree. C., with a residence time in the range of 40-120 minutes at temperatures above 250.degree. C.; and conducting an initial stage of the reaction in the presence of at least one C.sub.2-6 aliphatic diol such as ethylene glycol, diethylene glycol or 1,4-butanediol.