Polyamideimides and method for making
AssigneeGeneral Electric Company
InventorWilliam A. Fessler
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Abstract
Polyamideimides, resulting from the reaction of two moles of trimellitic anhydride, per mole of organic diamine, such as methylene dianiline, followed by contacting the resulting bis(N-4-carboxyphthalimido)organo reaction product with tolylene diisocyanate, have been found to be valuable dip coating compositions for electrical conductors. The polyamideimides also can be converted to electrocoating compositions having superior shelf stability.
Claims2
An electrocoating composition comprising (1) polyamide acid, (2) water, (3) organic solvent and a sufficient amount of (4) base to provide about 0.05 to about 1 meq of base per/gram of polymer, where said polyamide acid is the product of reaction of a polyamideimide and a base having an ionization constant greater than 10.sup..sup.-2 in water at 25.degree.C in the presence of an aprotic organic solvent for the polyamideimide, which is the reaction product of toluene diisocyanate and the dicarboxylic acid reaction product of two moles of trimellitic anhydride, per mole of organic diamine, where in forming the polyamideimide toluene diisocyanate is utilized in an amount at least sufficient to provide a substantially stoichiometric equivalence between isocyanate and carboxy of the dicarboxylic acid reaction product.
Dependencies are inferred from the claim text.