| 摘要 |
A method of purifying a poly(phenylene ether) is described. The method includes mixing a poly(phenylene ether) solution comprising a poly(phenylene ether) and a poly(phenylene ether) solvent with first washing solvents including a C1-C4 alkanol and water to form a first liquid phase including poly(phenylene ether) and poly(phenylene ether) solvent, and a second liquid phase comprising C1-C4 alkanol and water, and separating the first liquid phase from the second liquid phase. The first and second liquid phases combined comprise about 60 to about 95 weight percent poly(phenylene ether) solvent, about 4 to about 32 weight percent C1-C4 alkanol, and about 1 to about 36 weight percent water. When optionally combined with evaporative removal of the poly(phenylene ether) solvent, the method reduces C1-C4 alkanol usage compared to the antisolvent precipitation method, and it produces poly(phenylene ether) having reduced catalyst metal ion residue and reduced color. |
| 主权项 |
1. A method of purifying a poly(phenylene ether), comprising:
mixing
a poly(phenylene ether) solution comprising a poly(phenylene ether) and a poly(phenylene ether) solvent selected from the group consisting of toluene, xylenes, mesitylene, chlorobenzene, dichlorobenzenes, chloroform, and combinations thereof, andfirst washing solvents comprising a C1-C4 alkanol and water to forma first liquid phase comprising poly(phenylene ether) and poly(phenylene ether) solvent, anda second liquid phase comprising C1-C4 alkanol and water; and separating the first liquid phase from the second liquid phase; wherein the first liquid phase and the second liquid phase are present in a volume ratio of about 1.5:1 to about 10:1; wherein the first and second liquid phases combined comprise, based on 100 weight percent total of the poly(phenylene ether) solvent, the C1-C4 alcohol, and the water,
about 60 to about 95 weight percent poly(phenylene ether) solvent,about 4 to about 32 weight percent C1-C4 alkanol, andabout 1 to about 36 weight percent water; and wherein the first liquid phase comprises at least 95 weight percent of the poly(phenylene ether) in solution. |
