Back to results
US 5,668,186 AGranted
Process for depolymerizing polyesters
AssigneeGeneral Electric Company
InventorsDaniel Joseph Brunelle, Ganesh Kailasam, Judith Ann Serth-Guzzo, Paul Russell Wilson
Life of this patent
Estimating the term…
Abstract
The invention relates to a novel process for depolymerizing polyesters by subjecting the polyesters to catalysts and organic solvents which are substantially free of oxygen and water in order to produce macrocyclic polyester oligomers substantially free of hydroxybutyl terminated linear impurities.
Claims27
A process for depolymerizing polyester linears comprising the step of contacting in the presence of heat a mixture consisting essentially of:
- (a) polyester linears;
- (b) organic solvents which are substantially free of oxygen and water;
- and
- (c) depolymerization catalysts selected from the group consisting of tin compounds and titanium compounds.
1 more element
Dependencies are inferred from the claim text.