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Improved Melt Stable Polyester

IP.com Disclosure Number: IPCOM000009991D
Publication Date: 2002-Oct-07

Publishing Venue

The IP.com Prior Art Database


A process for improving the melt stability of polyesters such as PET in melt extrusion process wherein additives such as epoxies are used. The extrusion process is improved by supplying solid polymer into the feed section and venting moisture extracted from the polymer during the conversion of the polymer from a solid to a melt into a vent area and through a rear vent positioned in the feed section. The additive is added after the moisture is extracted which results in improved reaction with PET resulting in enhanced melt stability.