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:
Feb. 12, 1985
Filed:
Mar. 09, 1984
David R Fagerburg, Kingsport, TN (US);
Finley E McFarlane, Kingsport, TN (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Disclosed is a process for preparing sulfo-modified polyesters having an inherent viscosity of about 0.3 to about 0.9 and characterized by an improved planar stretch ratio relative to a given inherent viscosity, an improved rate of acetaldehyde generation relative to a given planar stretch ratio and increased buildup of melt viscosity. The process comprises the steps of (a) reacting (1) a dicarboxylic acid component comprising at least about 85 mole % terephthalic acid and about 0.1 to about 5.0 mole % of a difunctional sulfo-monomer, and (2) a glycol component comprising at least about 85 mole % ethylene glycol, the reaction being conducted in the presence of a catalyst system comprising a titanium compound and an organic salt of an alkali metal, (2) polycondensing the reaction product of step (1) in the presence of a phosphate ester until a polymer having the desired I.V. is obtained.