Process for controlling a particle size of polyarylene sulfide and polyarylene sulfide thus produced
US6369191B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1995 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Jul 21, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/0254
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A particle size of polyarylene sulfide obtained in polymerization is controlled by a process characterized in that a gaseous phase part of a reactor is cooled or heated after starting decreasing a temperature of a reaction system o an end of precipitation of polyarylene sulfide formed In an embodiment, a water content in the reaction system is 0.8 to 1.7 moles per mole of the alkali metal sulfide; the gaseous phase part of the reactor is cooled in a polymerization stage to thereby condense a part of a gaseous phase in the reactor and the condensed liquid is refluxed to a liquid phase in the reactor; and the gaseous phase part is only cooled after starting decreasing the temperature of the reaction system, whereby high molecular weight polyarylene sulfide suitable for powder coating is formed, which has a weight average molecular weight of at least 30,000 and an average particle size of 50 to 80 &mgr;m, wherein particles of 40 to 150 &mgr;m account for at least 90% by weight of the whole particles in a particle size distribution, and the amount of particles of 180 &mgr;m or more is 0.5% lby weight or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.