Aqueous emulsion thermosetting coating compositions

Claim 2

An aqueous emulsion thermosetting coating composition comprising water having emulsified therein: (1) an aqueous emulsion mercaptan-terminated copolymer of ethylenically unsaturated materials produced by emulsion copolymerization in the presence of surface active agents of monomers consisting essentially, based on the weight of the copolymer, of: A. from 0.75-25% of non-nitrogenous hydroxy functional monoethylenically unsaturated monomer; B. from about 0.1% to about 15% of monoethylenically unsaturated carboxylic acid; and C. the balance of said copolymer consisting essentially of monoethylenically unsaturated monomer free of functional groups other than said monoethylenic unsaturation; (2) from about 3% to about 40%, based on the total weight of resin solids, of an aminoplast resin; and (3) from about 5 to about 50 parts per 100 parts of copolymer of water dispersible high boiling polyhydric adduct of an aliphatic polyhydric alcohol having from 2-4 hydroxy groups with a C 2 -C 4 monoepoxide or a lactone containing 3-6 carbon atoms, said adduct having a molecular weight of from about 300 to about 6000.

Claim 3

An aqueous emulsion as recited in claim 1 in which said copolymer includes from 0.3-10% by weight of said monoethylenically unsaturated carboxylic acid.

Claim 4

An aqueous emulsion as recited in claim 1 in which said monomers are selected to provide a copolymer having a glass transition temperature above room temperature.

Claim 5

An aqueous emulsion as recited in claim 1 in which said monoethylenically unsaturated monomers free of functional groups consist of styrene or vinyl toluene in combination with C 4 -C 12 alcohol ester of acrylic acid, said styrene or vinyl toluene being used in a weight excess with respect to said ester of at least 2:1 up to about 8:1.

Claim 6

An aqueous emulsion as recited in claim 2 in which said hydroxy functional monomer is present in an amount of from 2-15% of said copolymer.

Claim 7

An aqueous emulsion as recited in claim 5 in which said hydroxy-functional monomer is an hydroxy alkyl ester of a monoethylenic monocarboxylic acid.

Claim 8

An aqueous emulsion as recited in claim 5 in which said monoethylenically unsaturated carboxylic acid is present in an amount of from 0.5-8% of said copolymer.

Claim 9

An aqueous emulsion as recited in claim 1 in which said copolymer is stabilized with ammonia or an amine.

Claim 10

An aqueous emulsion as recited in claim 1 in which mercaptan is present in admixture with the ethylenic materials being copolymerized in an amount of from 0.05% to about 5%, based on the weight of the copolymer.

Claim 11

An aqueous emulsion as recited in claim 1 in which said aminoplast resin is hexamethoxymethyl melamine.

Claim 12

An aqueous emulsion as recited in claim 1 in which said aminoplast resin is pigmented.

Claim 13

An aqueous emulsion as recited in claim 10 in which the dispersed hexamethoxymethyl melamine is present in an amount of from 5-30%, based on the total weight of resin solids.

Claim 14

An aqueous emulsion as recited in claim 1 in which said adduct is an adduct of ethylene oxide or propylene oxide with a saturated aliphatic polyhydric alcohol containing from 2-4 hydroxy groups as the sole reactive functionality, and from 2-6 carbon atoms.

Claim 15

An aqueous emulsion as recited in claim 13 in which said adduct has a molecular weight in the range of from about 400 to about 5000.

Claim 16

An aqueous emulsion as recited in claim 14 in which said adduct is a polyoxypropylene adduct of propylene glycol.

Claim 17

An aqueous emulsion as recited in claim 15 in which said adduct is present in an amount of from 10-35 parts per 100 parts of copolymer solids.

Claim 18

An aqueous emulsion thermosetting coating composition comprising water having dispersed therein: (1) an aqueous emulsion mercaptan-terminated copolymer of ethylenically unsaturated materials consisting essentially, based on the weight of the copolymer, of: A. from 0.75-25% of non-nitrogenous hydroxy functional monoethylenically unsaturated monomer; B. from 0.3-10% of monoethylenically unsaturated carboxylic acid; and C. the balance of said copolymer consisting essentially of monoethylenically unsaturated monomers free of functional groups other than said monoethylenic unsaturation, said monomers being selected to provide a copolymer having a glass transition temperature above room temperature, and said copolymer being stabilized in the aqueous medium with ammonia or an amine; (2) from about 3% to about 40%, based on the total weight of resin solids, of an aminoplast resin; and (3) from about 5 to about 50 parts per 100 parts of copolymer of water soluble high boiling polyhydric polyoxyalkene adduct of an aliphatic polyhydric alcohol having from 2-4 hydroxyl groups and from 2-6 carbon atoms with a C 2 -C 4 monoepoxide, said adduct having a molecular weight of from about 300 to about 6000.

Claim 19

An aqueous emulsion thermosetting coating composition comprising water having dispersed therein: (1) an aqueous emulsion mercaptan-terminated copolymer of ethylenically unsaturated materials consisting essentially, based on the weight of the copolymer, of: A. from 0.75-25% of non-nitrogenous hydroxy functional monoethylenically unsaturated monomer; B. from 0.3-10% of monoethylenically unsaturated carboxylic acid; and C. the balance of said copolymer consisting essentially of monoethylenically unsaturated monomers free of functional groups other than said monoethylenic unsaturation, said monomers being selected to provide a copolymer having a glass transition temperature above room temperature, and said copolymer being stabilized in the aqueous medium with ammonia or an amine; (2) from about 3% to about 40%, based on the total weight of resin solids, of an aminoplast resin; and (3) from about 5 to about 50 parts per 100 parts of copolymer of water soluble high boiling polyhydric polyoxyalkene adduct of an aliphatic polyhydric alcohol having from 2-4 hydroxyl groups and from 2-6 carbon atoms with a C 2 -C 4 monoepoxide, said adduct having a molecular weight of from about 300 to about 6000.

Claim 20

An aqueous emulsion as recited in claim 17 in which said polyoxyalkene adduct is a polyoxypropylene adduct of propylene glycol having a molecular weight in the range of from about 400 to about 5000, and is present in an amount of from 10-35 parts per 100 parts of copolymer solids.