Method of making a polyetherimide
AssigneeSabic Global Technologies B.V.
InventorsNitin Vilas Tople, Bernabe Quevedo Sanchez, Gregory L. Hemmer
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Abstract
A method of making a polyetherimide includes forming an intermediate polyetherimide with an anhydride-amine stoichiometry of −2 to −40 mol % and melt mixing the intermediate polyetherimide with a bis(ether anhydride) for greater than 3 minutes at a temperature 50 to 225° C. greater than the glass transition temperature of a final polyetherimide to produce the final polyetherimide.
Claims25
A method of making a polyetherimide comprises melt mixing a first bis(ether anhydride) and a diamine to form an intermediate polyetherimide with an anhydride-amine stoichiometry of −2 to −40 mol % and melt mixing the intermediate polyetherimide with a second bis(ether anhydride) for greater than 3 minutes at a pressure less than atmospheric pressure and a temperature 50 to 225° C. greater than the glass transition temperature of the final polyetherimide to produce a final polyetherimide.
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A polyetherimide having a change in viscosity of −35% to 50% after being maintained for 30 minutes at 390° C. wherein melt viscosity is determined by ASTM D4440, a polydispersity index of less than or equal to 2.75 and a solvent content less than 50 ppm.
A method of making a polyetherimide comprises melt mixing a first polyetherimide with a diamine to produce an intermediate polyetherimide with an anhydride-amine stoichiometry of −2 to −40 mol % and melt mixing the intermediate polyetherimide with a bis(ether anhydride) at a temperature 50 to 225° C. greater than the glass transition temperature of the final polyetherimide for greater than 3 minutes to produce the final polyetherimide.
Dependencies are inferred from the claim text.