Patent · US Expired

Method and device for the continuous polycondensation of polyester material in the solid phase

US7884177B2 · kind B2 · utility

1Cited by

5References

11Claims

0Family size

Assignee

Buhler AG · CH

Inventors

Camille Borer · Flurlingen, CH
Martin Muller · Berlin, DE
Brent Allan Culbert · Wil, CH

Key dates

Filing date	Feb 26, 2001
Grant date	Feb 8, 2011
Priority date	—
Expiry date	Apr 11, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/80
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method and device for the continuous polycondensation of polyester material in the solid phase, in particular in the form of partially crystalline granulate. The aim of the invention is to achieve a high product throughput on recrystallising and recondensation of polyester material with a low initial IV. Said aim is achieved, whereby on recrystallisation, a low residence time of 1-10 minutes is achieved, by means of a rapid heating of a thin product layer, followed by an SSP treatment.

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