Process for manufacturing polyarylene sulfide

Details Process for manufacturing polyarylene sulfide Process for manufacturing polyarylene sulfide

1996-08-21

1998-05-26

Glass, Margaret W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From sulfur-containing reactant

528388, C08G 7516

Patent

active

057566542

ABSTRACT:
Disclosed is a process for manufacturing polyarylene sulfide comprising pre-polymerizing a dihalogeno-aromatic compound with a liquid or gaseous sulfur compound in the presence of a lithium compound in an aprotic organic solvent followed by further polymerizing the resulting pre-polymerized system; which is characterized in that sufficient water is added to the pre-polymerized solution (I) to separate it into a tick polymer phase and a solvent phase, then a solvent is added to the thus-separated, thick polymer phase and the resulting polymer phase is further polymerized, for efficiently manufacturing high-purity polyarylene sulfide. The process does not require any complicated steps of washing the polymer with a multi-stage washing system and is free from the increase in the production costs of the polymer. In the process, the lithium salt used can be recovered efficiently.

REFERENCES:
patent: 4373090 (1983-02-01), Edmonds
patent: 4910294 (1990-03-01), Ogata et al.
patent: 5171831 (1992-12-01), Nesheiwat et al.
patent: 5175243 (1992-12-01), Ash

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