Method and apparatus for increasing an intrinsic viscosity of polyester
US7828538B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Oct 15, 2002 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Mar 29, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0094
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of increasing the intrinsic viscosity of polyester by means of solid state polymerization, wherein a polyester plastics melt is granulated and after granulation is conveyed into a thermal treatment container (13) for thermal treatment therein, the granules being produced slightly below their melting temperature and being fed into the thermal treatment container (13) immediately after granulation so as to utilize the residual heat in the granules, as well as an arrangement for increasing the intrinsic viscosity of polyester by means of solid state polymerization with a granulating and a thermal treatment unit, with an unheated, thermally insulated container (13) or a container (13) having wall heating means (15) being provided as the thermal treatment unit, which is directly connected to the granulating unit via a conveying device (11, 36, 37).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.