Method of purifying a polymer
AssigneeSabic Innovative Plastics IP B.V.
InventorDavid Bruce HALL
Life of this patent
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Abstract
A method for purifying a polymer comprising providing a first mixture comprising at least one solvent and at least one polymeric material, diluting the first mixture with veratrole to produce a second mixture in which the polymeric material is substantially dissolved at a temperature less than 100° C., performing at least one step selected from (i) contacting the second mixture with an aqueous wash solution, and (ii) filtering the second mixture.
Claims20
A method of purifying a polymer, said method comprising:
- (a) providing a first mixture comprising at least one solvent and at least one polyethersulfone, wherein the at least one solvent comprises a halogenated aromatic solvent;
- (b) diluting said first mixture with veratrole to produce a second mixture in which the polyethersulfone is substantially dissolved as indicated by a single organic phase at a temperature in a range from about 25° C. to about 100° C., and then;
- (c) performing at least one step selected from:
- (i) contacting the second mixture with an aqueous wash solution, and
- (ii) filtering said second mixture.
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A method of purifying a polyethersulfone, said method comprising:
- (a) providing a first mixture comprising at least one solvent and at least one polyethersulfone, wherein the at least one solvent comprises a halogenated aromatic solvent;
- (b) diluting said first mixture with veratrole to produce a second mixture in which the polyethersulfone is substantially dissolved at a temperature less than 100° C.;
- (c) performing at least one step selected from:
- (i) contacting the second mixture with an aqueous wash solution, and
- (ii) filtering said second mixture.
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A method of preparing a polymer, said method comprising:
- (a) polymerizing at least two reactants to provide a first mixture comprising at least one solvent and at least one polyethersulfone, wherein the at least one solvent comprises a halogenated aromatic solvent;
- (b) diluting said first mixture with veratrole to produce a second mixture in which the polyethersulfone is substantially dissolved at a temperature less than 100° C.;
- (c) performing at least one step selected from:
- (i) contacting the second mixture with an aqueous wash solution, and
- (ii) filtering said second mixture.
Dependencies are inferred from the claim text.