Method of separating a poly(arylene ether) composition from a solvent, and poly(arylene ether) composition prepared thereby
AssigneeSabic Innovative Plastics IP B.V.
InventorsChristina Louise Braidwood, Alvaro Carrillo, Hua Guo, Gerardo Rocha-Galicia
Life of this patent
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Abstract
A method of separating a poly(arylene ether) from a solvent includes treating a poly(arylene ether)-containing solution with a devolatilizing extruder to form an extruded composition, and cooling the extruded composition with a cooling device that does not immerse the extruded composition in water. The composition may be used to isolate a poly(arylene ether) from the solvent-containing reaction mixture in which it is prepared, or to remove solvent from a multi-component poly(arylene ether)-containing thermoplastic composition.
Claims37
A method of separating a poly(arylene ether) from a solvent, comprising:
- removing volatiles from a mixture comprising a poly(arylene ether) and a solvent by devolatilizing extrusion to form an extruded composition comprising the poly(arylene ether);
- wherein the devolatilizing extrusion comprises adding a solid poly(arylene ether) to a first section of an extruder, and adding the mixture to a second section of the extruder downstream of the first section;
- and
- cooling the extruded composition with a cooling device;
- wherein the cooling device cools the extruded composition without water immersion of the extruded composition;
- wherein the poly(arylene ether) comprises, on average, at least 1.5 hydroxy groups per molecule.
A method of isolating a poly(arylene ether), comprising:
- removing volatiles from a mixture comprising a poly(arylene ether) and a solvent by devolatilizing extrusion to form an extruded poly(arylene ether);
- wherein the devolatilizing extrusion comprises adding a solid poly(arylene ether) to a first section of an extruder, and adding the mixture to a second section of the extruder downstream of the first section;
- and
- cooling the extruded poly(arylene ether) with a cooling belt to form an isolated poly(arylene ether);
- wherein the isolated poly(arylene ether) is a polyhydroxy poly(arylene ether) comprising, on average, at least 1.5 hydroxy groups per molecule;
- wherein the isolated poly(arylene ether) has an intrinsic viscosity of about 0.04 to about 0.15 deciliter per gram as measured in chloroform at 25° C.;
- wherein the mixture comprises about 65 to about 85 weight percent poly(arylene ether) and about 15 to about 35 weight percent solvent;
- and
- wherein devolatilizing extrusion comprises feeding the mixture to an extruder comprising
- at least one barrel having a temperature of about 200 to about 235° C., and
- at least one vent having a pressure of about 20 to about 40 kilopascals.
A method of isolating a poly(arylene ether), comprising:
- removing volatiles from mixture comprising a poly(arylene ether) and a solvent by devolatilizing extrusion to form an extruded poly(arylene ether);
- wherein the devolatilizing extrusion comprises adding a solid poly(arylene ether) to a first section of an extruder, and adding the mixture to a second section of the extruder downstream of the first section;
- and
- cooling the extruded poly(arylene ether) with a cooling belt to form an isolated poly(arylene ether);
- wherein the mixture comprises about 70 to about 80 weight percent poly(arylene ether) and about 20 to about 30 weight percent toluene;
- and
- wherein the isolated poly(arylene ether) has an intrinsic viscosity of about 0.04 to about 0.10 deciliter per gram as measured in chloroform at 25° C.;
- wherein the isolated poly(arylene ether) has, on average, at least 1.5 hydroxy groups per molecule;
- wherein the isolated poly(arylene ether) comprises a poly(arylene ether) having the structure
- wherein each occurrence of Q7 and Q8 is independently methyl or di-n-butylaminomethyl;
- and each occurrence of a and b is independently 0 to about 12, provided that the sum of a and b is at least 1;
- wherein devolatilizing extrusion comprises feeding the mixture to an extruder comprising
- at least one barrel having a temperature of about 210 to about 230° C., and
- at least one vent having a pressure of about 25 to about 35 kilopascals;
- wherein the mixture is fed to the extruder downstream of at least one vent;
- and
- wherein a portion of the isolated poly(arylene ether) is recycled for addition to the feed throat of the extruder.
Dependencies are inferred from the claim text.