Film forming compositons from polycarboxylic acids and adducts of polyepoxides and amines

Claim 2

A process for obtaining a cured coating on a substrate, which comprises the steps of: a. Mixing a polyepoxide-amine adduct which is free of unreacted epoxide groups with a polycarboxylic acid or acid anhydride, b. dissolving the mixture obtained in a. in a solvent, c. coating a substrate with the solution obtained in b., and d. curing the coating obtained in c. by heating at from about 75* to about 350* centigrade, wherein,

Claim 3

said polyepoxide-amine adduct is the product of either ammonia or a primary amine, and a polyepoxide, reacted at a temperature in the range of from about 50* to about 250* centigrade, wherein, a. said primary amine is aliphatic cycloaliphatic, or aromatic, and contains a single nitrogen atom and from one to about eight carbon atoms, b. said polyepoxide contains more than one 1,2-epoxide group, and is selected from the group consisting of polyglycidyl ethers of polyhydric phenols, polyglycidyl ethers of polyhydric alcohols, glycidyl esters of polycarboxylic acids, epoxidized hydrocarbons anD esters, and polymers and copolymers of vinyl polymerizable monoepoxides, and c. the amount of said ammonia or primary amine employed is about 1 mol per 1,2-epoxide group of said polyepoxide,

Claim 4

said polyepoxide-amine adduct is the product of either ammonia or a primary amine, and a polyepoxide, reacted at a temperature in the range of from about 50* to about 250* centigrade, wherein, a. said primary amine is aliphatic cycloaliphatic, or aromatic, and contains a single nitrogen atom and from one to about eight carbon atoms, b. said polyepoxide contains more than one 1,2-epoxide group, and is selected from the group consisting of polyglycidyl ethers of polyhydric phenols, polyglycidyl ethers of polyhydric alcohols, glycidyl esters of polycarboxylic acids, epoxidized hydrocarbons anD esters, and polymers and copolymers of vinyl polymerizable monoepoxides, and c. the amount of said ammonia or primary amine employed is about 1 mol per 1,2-epoxide group of said polyepoxide,

Claim 5

said polycarboxylic acid or acid anhydride is selected from the group consisting of aliphatic polycarboxylic acids and anhydrides having from two to about 10 carbon atoms, aromatic polycarboxylic acids and anhydrides having from eight to about 20 carbon atoms, cycloaliphatic polycarboxylic acids and anhydrides having from eight to about 20 carbon atoms, and dimerized and trimerized fatty acids.

Claim 6

said polycarboxylic acid or acid anhydride is selected from the group consisting of aliphatic polycarboxylic acids and anhydrides having from two to about 10 carbon atoms, aromatic polycarboxylic acids and anhydrides having from eight to about 20 carbon atoms, cycloaliphatic polycarboxylic acids and anhydrides having from eight to about 20 carbon atoms, and dimerized and trimerized fatty acids.

Claim 7

The process of claim 1 wherein the mixture obtained in step a. contains from about 10 to about 40 weight percent, based on the total weight of said mixture, of an aminoplast resin selected from the group consisting of the urea-formaldehyde resins, the melamine-formaldehyde and alkylated melamine-formaldehyde resins, and the benzoguanamine-formaldehyde and alkylated benzoguanamine-formaldehyde resins.

Claim 8

The process of claim 2 wherein said mixture also contains from about 1 to about 2 weight percent, based on the total weight of said mixture, of the morpholine salt of p-toluenesulfonic acid.

Claim 9

The ratio of the number of nitrogen atoms in said polyepoxide-amine adduct to the number of carboxylic acid equivalents in said polycarboxylic acid anhydride is in the range of from about 1:1 to about 1:2,

Claim 10

The ratio of the number of nitrogen atoms in said polyepoxide-amine adduct to the number of carboxylic acid equivalents in said polycarboxylic acid anhydride is in the range of from about 1:1 to about 1:2,

Claim 11

said solvent consists of from about 20 to 100 weight percent water and up to about 80 weight percent of a co-solvent selected from the group consisting of the water-soluble aliphatic organic solvents and polyols and monoethers thereof, and

Claim 12

said solvent consists of from about 20 to 100 weight percent water and up to about 80 weight percent of a co-solvent selected from the group consisting of the water-soluble aliphatic organic solvents and polyols and monoethers thereof, and

Claim 13

The process of claim 1 wherein said primary amine is n-butylamine.

Claim 14

The process of claim 1 wherein said primary amine is a hydroxy-substituted amine having from 1 to 3 hydroxy groups and from 2 to about 6 carbon atoms.

Claim 15

the amount of said solvent employed is sufficient to provide a solution containing from about 10 to about 80 weight percent of solids, based on the total weight of the solution.

Claim 16

the amount of said solvent employed is sufficient to provide a solution containing from about 10 to about 80 weight percent of solids, based on the total weight of the solution.

Claim 17

The process of claim 5 wherein said primary amine is isopropanol amine.

Claim 18

The process of claim 5 wherein said polyepoxide is a diglycidyl ether of p,p''-dihydroxydiphenyl propane having a weight per epoxide of from about 180 to about 250, said primary amine is ethanol amine, and said polycarboxylic acid is adipic acid.

Claim 19

The process of claim 5 wherein said polyepoxide is a diglycidyl ether of p,p''-dihydroxydiphenyl propane having a weight per epoxide of from about 180 to about 250, said primary amine is ethanol amine, said polycarboxylic acid is sebacic acid, said co-solvent is the monobutyl ether of ethylene glycol, and said mixture contains from about 15 to about 25 weight percent, based on the total weight of the mixture, of hexamethoxy methyl melamine.

Claim 20

The process of claim 5 wherein the solids content is in the range of from about 30 to about 80 weight percent.

Claim 21

The process of claim 5 wherein the solids content is in the range of from about 40 to about 60 weight percent.