Division of a polyarylene ether solution
Joerg Erbes, Karlsruhe (DE); Gerhard Lange, Schriesheim (DE); Tobias Kortekamp, Mannheim (DE); and Cecile Schneider, Frankenthal (DE)
Assigned to BASF SE, Ludwigshafen (DE)
Filed by BASF SE, Ludwigshafen (DE)
§ 371(c)(1), (2) Date Apr. 6, 2016,
Prior Publication US 2016/0215105 A1, Jul. 28, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. C08G 75/00 (2006.01); C08J 3/14 (2006.01); C08G 65/46 (2006.01); C08G 75/23 (2006.01)
CPC C08J 3/14 (2013.01) [C08G 65/46 (2013.01); C08G 75/23 (2013.01); C08J 2371/10 (2013.01); C08J 2381/06 (2013.01)] 12 Claims
1. A process for producing polyarylene ether beads from a polyarylene ether solution, comprising:
i) dividing the polyarylene ether solution into droplets; and
ii) transferring the droplets into a precipitation bath to form polyarylene ether beads in the precipitation bath which
(A) comprises an aprotic solvent (component (1)) and a protic solvent (component (2)), and
(B) has a temperature of 0° C. to Tc, where the critical temperature Tc in [° C.] is determined by the numerical equation Tc=(99−c)/0.61 in which c is the concentration of component (1) in the precipitation bath in [% by weight],
wherein the percentages by weight are each based on the sum of the percentages by weight of component (1) and of component (2) in the precipitation bath,
wherein the precipitation bath comprises water or alcohol as component (2),
the polyarylene ether solution has a concentration of 5 to 50% by weight of polyarylene ether in the aprotic solvent, where the percentages by weight are based on the sum of the percentages by weight of the polyarylene ether and the aprotic solvent,
the polyarylene ether solution on division has a temperature of 15 to 250° C.,
the aprotic solvent is selected from the group consisting of dimethyl sulfoxide, dimethylformamide, sulfolane, diphenyl sulfone, 1,2-dichlorobenzene, hexamethylphosphoramide and mixtures thereof, and
wherein, in the polyarylene ether beads formed from the precipitation bath in (ii), a content of particles having a particle size of less than or equal to 1000 μm is less than 8.15% by weight.