US 9,809,681 B2
Method for forming a low viscosity polyarylene sulfide
Venkata M. Nekkanti, Florence, KY (US); Hendrich A. Chiong, Cincinnati, OH (US); and Jacob Grayson, Cincinnati, OH (US)
Assigned to Ticona LLC, Florence, KY (US)
Filed by Ticona LLC, Florence, KY (US)
Filed on Feb. 17, 2016, as Appl. No. 15/45,296.
Claims priority of provisional application 62/117,988, filed on Feb. 19, 2015.
Claims priority of provisional application 62/197,634, filed on Jul. 28, 2015.
Claims priority of provisional application 62/206,124, filed on Aug. 17, 2015.
Prior Publication US 2016/0244567 A1, Aug. 25, 2016
Int. Cl. C08G 75/00 (2006.01); C08G 75/14 (2006.01); B01D 11/02 (2006.01); B01D 21/02 (2006.01); C08G 85/00 (2006.01)
CPC C08G 75/14 (2013.01) [B01D 11/0288 (2013.01); B01D 21/02 (2013.01); C08G 85/002 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for forming a washed polyarylene sulfide, the method comprising contacting a slurry of a polyarylene sulfide with a washing solution within a vessel in which the slurry of the polyarylene sulfide enters the vessel at a slurry inlet that is located such that solids of the slurry flow via a gravity flow from the slurry inlet to a solids outlet and in which the washing solution enters the vessel at a liquid inlet and flows counter current to the gravity flow of the solids to a liquid outlet that is above the slurry inlet, wherein the washing solution contains from about 30 wt. % to about 70 wt % of water and from about 30 wt. % to about 70 wt. % of an aprotic organic solvent, wherein the washed polyarylene sulfide has an oligomer content of from about 0.5 wt. % to about 2 wt. % and a melt viscosity of about 2,350 poise or less, as determined in accordance with ISO Test No. 11443:2005 at a shear rate of 1200 s−1 and at a temperature of 310° C.