Polymer treatment
US7776998B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2003 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | May 31, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B2009/168
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the separation of volatile material from particulate polymer which has been substantially freed from unreacted monomer in an earlier separation step, comprising (a) feeding the particulate polymer to a purge vessel, optionally causing it to move through the vessel in substantially plug-flow mode, (b) heating the particulate polymer in the purge vessel to a temperature grater than 30° C. but insufficiently high to cause the particles to become agglomerated, and/or maintaining the polymer at a temperature in this range in the purge vessel, (c) feeding gas to the purge vessel counter-current to the movement of the particulate polymer to remove volatile material therefrom, (d) removing the particulate polymer from the purge vessel, wherein substantially all of the heating of the particles which occurs in the purge vessel is accomplished by preheating the gas fed into the purge vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.