Binder solutions
View Patent ↗The present invention is directed to alternate solvent systems for polyethersulfone, polyamideimide, polyether imide, polyimide, and/or polyamic acid binder solutions. The present invention provides stable binder solutions equivalent or superior to current binder solvent solutions.
1. A binder solution comprising polyethersulfone, polyamideimide, polyether imide, polyimide, or mixtures thereof, and solvent comprising acetoacetamides.
2. A binder solution of claim 1 further comprising one or more of: viscosity modifiers, thinning solvents, binders, pigments, fillers, dispersing aids, surface tension modifiers, and fluoropolymers.
3. The binder solution of claim 2 wherein the thinning solvent is a diether or a glycol ether acetate.
4. The binder solution of claim 1 wherein the solvent comprises diethyl acetoacetamide.
5. A binder solution of claim 1 , wherein the solvent comprises a mixture of diethyl acetoacetamide and at least one solvent selected from the group consisting of: delta-valerolactone, gamma-valerolactone, gamma butyrolactone, epsilon-caprolactone, dimethyl piperidone, tetramethyl guanidine, methyl acetoacetate, dodecyl acetoacetate, isobutyl acetoacetate, isopropyl acetoacetate, and ethyl acetoacetate.
6. The binder solution of claim 1 having a resin binder solids content of at least 30%, as a percentage by weight of the total composition, and a viscosity of no greater than 20,000 mPa·s.
7. The binder solution of claim 1 wherein the binder solution comprises polyethersulfone and solvent comprises acetoacetamide.
8. The binder solution of claim 7 comprising polyethersulfone and diethylacetoacetamide.