Process for production of polyarylene sulfides

Details Process for production of polyarylene sulfides Process for production of polyarylene sulfides

1993-06-25

1994-09-27

Marquis, Melvyn I.

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

Synthetic resins

From sulfur-containing reactant

525537, C08G 7514

Patent

active

053508335

ABSTRACT:
In a process for preparing a polyarylene sulfide by reacting an alkali metal sulfide and at least one dihaloaromatic compound in an organic amide solvent at an elevated temperature: a highly pure anhydrous alkali metal sulfide reactant having a purity of at least 95% by weight and a content of alkali metal hydrosulfide impurity of not greater than 2% by weight is employed. The water is deliberately added in a proportion of 0.1 to 0.8 moles per each mole of the alkali metal sulfide used in the process. The alkali metal sulfide reactant is charged in a concentration of 2.5 to 5 moles per liter of the reaction mixture. The deliberate addition of water enables one to omit a dehydration stage which has been desirably or rather necessarily effected to obtain a satisfactory polymer product where a hydrous alkali metal sulfide reactant is employed. The improved process of the invention provides a highly pure polyarylene sulfide product having a relatively increased molecular weight and a decreased content of by-product oligomers.

REFERENCES:
patent: 3919177 (1975-11-01), Campbell
patent: 4282347 (1981-08-01), Tieszen et al.
patent: 4631336 (1986-12-01), Idel et al.
patent: 4663430 (1987-05-01), Ostlinning et al.
patent: 5008368 (1991-04-01), Nesheiwat

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