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. 11, 1982
Filed:
Dec. 01, 1980
Willem F Borman, Pittsfield, MA (US);
General Electric Company, Pittsfield, MA (US);
Abstract
Poly(butylene terephthalates) are prepared by an improved process which makes it possible to directly esterify terephthalic acid and 1,4-butanediol without excessive loss of the diol reactant to side reactions. In the process, the conditions are controlled to promote rapid removal of the water as formed. It is also advantageous to minimize the contact time between 1,4-butanediol and terephthalic acid. Illustratively, 1,4-butanediol will be heated to 175.degree.-275.degree. C., terephthalic acid is gradually added, and byproduct water is removed as formed. In another embodiment, a mixture of terephthalic acid and an excess of 1,4-butanediol is heated and byproduct water is removed by entrainment in the excess 1,4-butanediol distilled from the reaction zone.