Process for producing polyarylene sulfide
US6982312B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 4, 2002 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | Mar 4, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/0254
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed a process for producing a polyarylene sulfide (PAS) which comprises reacting a sulfur source with a dihalogenated aromatic compound in the presence of an aprotic organic solvent, characterized in that the process comprises at least one polymerization reaction step wherein a polymer phase as a dispersed phase is in the form of spherical droplets. It is made possible by the continuous polymerization process to discharge the polymer phase and solvent phase from a polymerization vessel at a constant ratio and as a result, to maintain PAS composition (concentration) at a constant level at all times, and thus to provide a continuous PAS production process which is effective for enhancing its molecular weight and stabilizing the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.