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. 04, 2018
Filed:
Sep. 03, 2015
Sulzer Chemtech Ag, Winterthur, CH;
Liborio Ivano Costa, Winterthur, CH;
Hans-Peter Brack, Herrliberg, CH;
Francesca Tancini, Wettingen, CH;
Yingchuan Yu, Zürich, CH;
Sulzer Chemtech AG, Winterthur, CH;
Abstract
A process of manufacturing a polyester from cyclic ester monomer comprises the steps of: a) providing a cyclic ester, b) polymerizing the cyclic ester in the presence of a catalyst and optionally an initiator in a reactor to form a reaction mixture comprising polyester and unreacted cyclic ester, wherein after the polymerization at least one polymerization inhibitor is added to the reaction mixture, wherein the polymerization inhibitor is selected from the group consisting of monoimines, diimines, mono alkyl phosphates according to the formula RPOH, wherein R is a Clinear, branched or cyclic alkyl group, di alkyl phosphates according to the formula RPOH, wherein each R is independently a Clinear, branched or cyclic alkyl group or a combination thereof, and phosphate esters according to the general formula (I) wherein at least one of R', R″ and R″′ has the general structure as in general formula (II) wherein n>0 and Q is independently a Clinear, branched or substituted alkyl group, and R is independently an H or linear, branched, cyclic or substituted alkyl group or a phenyl group derivative, and wherein any of R′, R″ and R″′ not having the general structure as in general formula (II) is independently an H or a linear, branched, cyclic or substituted alkyl group or a phenyl group derivative.