| abstract |
In the preparation of polyarylene sulfide (PAS) by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent to obtain a polyarylene sulfide slurry and subjecting the slurry to acid treatment, an acid or hydrogen salt is added to the slurry in such an amount that a pH of the slurry is more than 7.0 and at most 11.0 to carry out the acid treatment. Alternatively, a zinc compound in an amount of 0.1 to 1.5 mole % per mole of the alkali metal sulfide supplied is added to the polyarylene sulfide slurry to treat the slurry, and, then, an acid or hydrogen salt in an amount of at least 0.2 mole % per mole of the alkali metal sulfide supplied is added.The PAS thus obtained has high crystallization speed, high whiteness, high mechanical strength and high melt viscosity, V6. |