| 摘要 |
A process for the preparation of a granular polyarylene sulfide comprises: A) an initial-stage polymerization step for obtaining a polyarylene sulfide by reacting an alkali metal sulfide, a dihaloaromatic compound and a polyhaloaromatic compound, having three or more halogen substituents per molecule, in an organic amide solvent in the presence of from 0.5 to 2.9 moles of water per mol of said alkali metal sulfide at a temperature of from 180 to 235<o>C until the total conversion ratio of said dihalo- and polyhaloaromatic compounds reaches from 50 to 98% and the melt viscosity of a polyarylene sulfide obtained is from 0.5 to 500 Pas (5 to 5,000 poise) measured at 310<o>C and a shear rate of 1,200/second; (B) a temperature raising step in which, while adjusting the amount of water as necessary to from 2.5 to 7 moles per mol of fed alkali metal sulfide, the temperature is raised from the temperature of step (A) to 240<o>C under such conditions that the melt viscosity of the polymer obtained at 240<o>C is from 30 to 1000 Pas (300 to 10,000 poise) measured at 310<o>C and a shear rate of 1,200/second and the temperature is further raised from 240<o>C to the temperature for step (C) at a rate of from 10 to 100<o>C/hour; and (C) a second-stage polymerization step for further continuing polymerisation at a temperature of from 245 to 290<o>C until the melt viscosity of the final polyarylene sulfide product reaches a value not lower than 1 x 10<4> Pas (1 x 10<5> poise) measured at 330<o>C and a shear rate of 2/second. , |
