Kureha Corporation

Yui Yoshida

Akihiro Konno

Ken-Ichi Takaki

Hiroyuki Sato

Yasuhiro Suzuki

Hiroshi Sakabe

Kazuhiko Sunagawa

Shingo Taniguchi

A method of producing a polyarylene sulfide (PAS) includes a preparation step of preparing a charged mixture containing an organic amide solvent, a sulfur source, water, and a dihalo aromatic compound; a first-stage polymerization step of performing a polymerization reaction on the charged mixture at a temperature of from 170 to 280&#xb0; C. to produce a prepolymer having a conversion ratio of the dihalo aromatic compound of 50% or greater; and a second-stage polymerization step of continuing the polymerization reaction in a phase-separated state at a temperature of from 245 to 290&#xb0; C. in a reaction system containing the prepolymer, and includes adding a polyfunctional compound to the reaction system in the phase-separated state. A PAS having a melt viscosity (310&#xb0; C., shear rate: 1216 sec) of from 0.1 to 8000 Pa&#xb7;s is produced by the method.

Polyarylene sulfide production method and polyarylene sulfide

A granular polyarylene sulfide; (i) the granular polyarylene sulfide containing an &#x2014;S&#x2014; substituent at the terminal, the substituent being formed by cleavage of a disulfide compound; (ii) the granular polyarylene sulfide being an oversize fraction after sifting with a sieve having a mesh size of at least 38 &#x3bc;m; (iii) the granular polyarylene sulfide having a halogen content of at most 1,500 ppm; and (iv) the granular polyarylene sulfide being a granular polyarylene sulfide having a melt viscosity of 3 to 100 Pa&#xb7;s when measured under conditions at a temperature of 310&#xb0; C. and a shear rate of 1,200 sec. The granular polyarylene sulfide is well balanced in melt viscosity, halogen content, nitrogen content, thermal stability, and yield.

Granular polyarylene sulfide and process for manufacturing the same

Disclosed are a branched poly(arylene sulfide) resin having a melt viscosity measured at a temperature of 310&#xb0; C. and a shear rate of 1200 secof 65 to 450 Pa&#xb7;s, a maximum draft ratio of 6500 or more, and a degree of whiteness of 65 or more; moreover, a branched poly(arylene sulfide) resin preferably having a dependence of melt viscosity on shear rate of 1.4 to 2.6 or a melt stability of 0.85 to 1.30; and a method for producing a branched poly(arylene sulfide) resin, wherein a sulfur source and a dihaloaromatic compound are caused to undergo a polymerization reaction at a temperature of 170 to 290&#xb0; C. in the organic amide solvent in the presence of a polyhaloaromatic compound in an amount of 0.0001 to 0.01 mol per mol of the fed sulfur source.

Branched poly(arylene sulfide) resin and method for producing same

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Tokyo, Japan

Yui Yoshida