Patent · US Active

Method for the production of polyester granulates from highly viscous polyester melts and also device for the production of the polyester granulates

US7993557B2 · kind B2 · utility

5Cited by

1References

19Claims

0Family size

Assignees

UHDE INVENTA-FISCHER GMBH · DE
BKG Bruckmann & Kreyenborg · DE

Inventors

Kurt Hanimann · Rodels, CH
Eike Schulz Van Endert · Berlin, DE
Theodor Bruckmann · Greven, DE

Key dates

Filing date	Aug 21, 2008
Grant date	Aug 9, 2011
Priority date	—
Expiry date	Feb 22, 2029

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2067/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a method and device for the direct production of polyester granulate from a highly viscous polyester melt with a polymerization degree of 132 to 165, as well as the granulates formed thereform. In the method, the highly viscous polyester melt is subjected to a pre-drying and drying/degassing after a hot cutting method. Hot cutting is implemented at water temperatures of 70° C. to 95° C. and with a liquid to solid ratio of 8 to 12:1.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.