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AssigneeToray Industries, Inc.
InventorsTakeshi Unohara, Yoshiki Makabe, Naoya Nakamura, Kei Saitoh, Atsushi Ishio, Masahiro Inohara
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A process for producing a polyphenylene sulfide resin with properties of (1) 0.3 wt % or less in the amount of the volatile gas generated when heated and melted at 320° C. in vacuum for 2 hours, (2) 0.3 wt % or less in the ash content achieved when incinerated at 550° C., (3) 4.0 wt % or less in the residue amount achieved when a solution with 1 part by weight of the polyphenylene sulfide resin dissolved in 20 parts by weight of 1-chloronaphthalene is pressure-filtered by a PTFE membrane filter with a pore size of 1 μm at 250° C. for 5 minutes, and (4) higher than 500 g/10 min in melt flow rate (according to ASTM D-1238-70: measured at a temperature of 315.5° C. and at a load of 5000 g), by acid-treating a polyphenylene sulfide resin in an acid treatment step and subsequently treating it for thermal oxidation in a thermal oxidation step.
A process for producing a polyphenylene sulfide resin with properties of (1) 0.3 wt % or less in an amount of volatile gas generated when heated and melted at 320° C. in a vacuum for 2 hours, (2) 0.3 wt % or less in ash content achieved when incinerated at 550° C., (3) 4.0 wt % or less in residue amount achieved when a solution with 1 part by weight of the polyphenylene sulfide resin dissolved in 20 parts by weight of 1-chloronaphthalene is pressure-filtered by a PTFE membrane filter with a pore size of 1 μm at 250° C. for 5 minutes, and (4) higher than 500 g/10 min in melt flow rate (according to ASTM D-1238-70:
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