Electrocoating compositions and method for making same

Claim 2

POLYAMIDE ACID BASE MIXTURES HAVING FROM ABOUT 0.05 TO ABOUT 1.0 MEQ OF BASE PER GRAM OF POLYAMIDE ACID, COMPRISING BY WEIGHT, A. 2 TO 15% OF A DISPERSED PHASE OF A PARTICULATED POLYAMIDE ACID HAVING LESS THAN ABOUT 25 PPM OF TITRATABLE CHLORIDE BASED ON THE WEIGHT OF POLYAMIDE ACID, WHICH PRIOR TO BEING AT LEAST PARTIALLY BASE NEUTRALIZED IS THE PRODUCT OF REACTION OF SUBSTANTIALLY EQUAL MOLAR AMOUNTS OF AN ORGANIC DIAMINE OF THE FORMULA,

Claim 3

An electrocoatable composition in accordance with claim 1, where the organic diamine is methylene dianiline.

Claim 4

washing the precipitated polyamide acid reaction product to produce solids having less than 25 ppm of titratable chloride, and

Claim 5

washing the precipitated polyamide acid reaction product to produce solids having less than 25 ppm of titratable chloride, and

Claim 6

agitating a mixture consisting essentially of the washed polyamide acid solids, water, organic solvent and base to provide for the production of an aqueous electrocoating mixture comprising by weight A. 2 to 15% of polyamide acid B. 85 to 98% of solvent containing as essential ingredients, (i) water and ii. organic solvent selected from a class consisting of N,N-dimethylformamide, N,N-diethylacetamide, N,N-diethylformamide, N,N-diethylacetamide, N,N-dimethylmethoxyacetamide, N-methylcaprolactam, dimethylsulfoxide, N-methyl-2-pyrrolidone, tetramethylurea, pyridine, dimethylsulfone, tetramethylenesulfone, N-methylformamide, and N-acetyl-2-pyrrolidone, where the ratio (i)/(ii) has a value of from 3.75 to 1.0, and sufficient base to provide from about 0.05 to about 1.0 meq of base per gram of polymer, where R is selected from a divalent aromatic hydrocarbon radical having from 6 to 18 carbon atoms, and R''QR'', R'' is a divalent aromatic selected from R radicals and Q is a member selected from -O-,

Claim 7

agitating a mixture consisting essentially of the washed polyamide acid solids, water, organic solvent and base to provide for the production of an aqueous electrocoating mixture comprising by weight A. 2 to 15% of polyamide acid B. 85 to 98% of solvent containing as essential ingredients, (i) water and ii. organic solvent selected from a class consisting of N,N-dimethylformamide, N,N-diethylacetamide, N,N-diethylformamide, N,N-diethylacetamide, N,N-dimethylmethoxyacetamide, N-methylcaprolactam, dimethylsulfoxide, N-methyl-2-pyrrolidone, tetramethylurea, pyridine, dimethylsulfone, tetramethylenesulfone, N-methylformamide, and N-acetyl-2-pyrrolidone, where the ratio (i)/(ii) has a value of from 3.75 to 1.0, and sufficient base to provide from about 0.05 to about 1.0 meq of base per gram of polymer, where R is selected from a divalent aromatic hydrocarbon radical having from 6 to 18 carbon atoms, and R''QR'', R'' is a divalent aromatic selected from R radicals and Q is a member selected from -O-,

Claim 8

A composition in accordance with claim 1, where the organic solvent is N-methylpyrrolidone.