Patent · US Active

Method for increasing the molecular weight of a polyester granulate by using its residual heat

US8877107B2 · kind B2 · utility

3Cited by

1References

23Claims

0Family size

Assignee

UHDE INVENTA-FISCHER GMBH · DE

Inventors

Kurt Hanimann · Rodels, CH
Rainer Schaller · Wertingen, DE
Eike Schulz Van Endert · Berlin, DE

Key dates

Filing date	Sep 27, 2011
Grant date	Nov 4, 2014
Priority date	—
Expiry date	Sep 27, 2031

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29B2009/168
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The present invention relates to increasing the molecular weight during a thermal treatment of polyester in combination with a latent heat granulation. With the newly-developed method, an SSP (Solid State Postcondensation) can be directly combined with an underwater granulation. The method differs from a conventional solid state postcondensation by an increase in the molecular weight being possible without additional heat input and hence only by using the residual heat and the crystallization heat present. A characterizing element is improved water separation and dehumidification during the granulation. Only in this way is an increase in viscosity possible even with a small granulate of an average particle weight less than 20 mg.

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