Cationic electrodeposition compositions for producing chip-resistant films

Claim 2

A cationic electrodeposition coating composition comprising, in aqueous dispersion: a. A modified alkyd composition derived from the reaction of a polyol with at least one unsaturated fatty acid and reacted with addition polymerizable ethylenically unsaturated monomers including an amine-functional unsaturated monomer in a guantity sufficient to render the coating composition water-dispersible and cationically electrodepositable; and b. A reactive agent in sufficient guantity to significantly improve the resistance to chipping of a cured coating resulting from the electrodeposition of the composition upon a metal substrate, the agent including at least one ethylenically unsaturated, addition polymerizable monomer or oligomer having a substantially linear backbone, a molecular weight of at least about 150, and being polymerizable under free radical initiating conditions.

Claim 3

The composition of claim 1 wherein the at least one monomer or oligomer contains a backbone that is predominantly polymethylene and contains an average of at least about 1.2 ethylenically unsaturated groups per molecule.

Claim 4

The composition of claim 2 wherein the monomer or oligomer is a compound of the formula R--(CH.sub.2).sub.x --R.sub.1 wherein x is 8 or more, R is an ethylenically unsaturated group, and R 1 is an ethylenically unsaturated group, hydrogen, methyl, or a hydroxyl, carboxyl, amine or isocyanate functional group.

Claim 5

The composition of claim 3 wherein the monomer or oligomer is a C 12 -C 18 diol diacrylate or dimethacrylate.

Claim 6

The composition of claim 1 wherein the monomer or oligomer is the reaction product of a polyisocyanate and an acrylate or methacrylate.

Claim 7

The composition of claim 1 wherein the alkyd is formed to contain an elastomer having functional groups reacted with hydroxyl or carboxyl group of the alkyd and in sufficient guantity to substantially improve said chip resistance of the cured coating.

Claim 8

The composition of claim 6 wherein said elastomer is the polymerization or copolymerization product of butadiene.

Claim 9

The composition of claim 6 wherein said elastomer is the addition copolymerization reaction product of butadiene and acrylonitrile.

Claim 10

The composition of claim 1 or claim 6 wherein said addition-polymerizable, ethylenically unsaturated monomers from which the modified alkyd composition is derived include a monomer having a molecular weight of at least 200 and having at least one primary and at least one secondary ethylenically unsaturated group, said monomer being present in sufficient guantity to significantly increase chip resistance.

Claim 11

The composition of claim 9 wherein said monomer having at least one primary and at least one secondary ethylenically unsaturated group comprises the reaction product of an acrylate or an allyl alcohol or its derivatives with an unsaturated acid.

Claim 12

The coating composition of claim 9 wherein the monomer having at least one primary and at least one secondary ethylenically unsaturated group is the reaction product of glycidyl methacrylate with an unsaturated fatty acid.

Claim 13

A cationic electrodeposition coating composition comprising, in aqueous dispersion: a. A modified alkyd composition derived from the reaction of a polyol with at least one unsaturated fatty acid and reacted with addition polymerizable ethylenically unsaturated monomers including an amine functional unsaturated monomer in a guantity sufficient to render the coating composition water-dispersible and cationically electrodepositable; and b. A reactive agent in sufficient quantities to significantly improve the resistance to chipping of a cured coating resulting from the electrodeposition of the composition upon a metal substrate, the agent including at least one ethylenically unsaturated, addition polymerizable monomer or oligomer having a substantially linear backbone that is predominantly polymethylene, which has a molecular weight of at least about 150 and an average of at least about 1.2 ethylenically unsaturated groups per molecule, and which is polymerizable under free radical initiating conditions.

Claim 14

A cationic electrodeposition coating composition comprising, in aqueous dispersion: a. A modified alkyd composition derived from the reaction of a polyol with at least one unsaturated fatty acid and reacted with addition polymerizable ethylenically unsaturated monomers including an amine functional unsaturated monomer in a guantity sufficient to render the coating composition water-dispersible and cationically electrodepositable; and b. A reactive agent in sufficient quantities to significantly improve the resistance to chipping of a cured coating resulting from the electrodeposition of the composition upon a metal substrate, the agent including at least one ethylenically unsaturated, addition polymerizable monomer or oligomer having a substantially linear backbone that is predominantly polymethylene, which has a molecular weight of at least about 150 and an average of at least about 1.2 ethylenically unsaturated groups per molecule, and which is polymerizable under free radical initiating conditions.

Claim 15

The composition of claim 12 wherein the monomer or oligomer of the reactive agent is the reaction product of a polyisocyanate and an acrylate or methacrylate.

Claim 16

The composition of claim 12 wherein the monomer or oligomer is a C 12 -C 18 diol diacrylate or dimethacrylate.

Claim 17

The composition of any of claims 12 -14 wherein the alkyd is formed to contain the polmerization or copolymerization product of butadiene reacted with hydroxyl or carboxyl groups of the alkyd and in sufficient guantity to substantially improve said chip resistance of the cured coating.

Claim 18

The composition of claim 15 wherein said product is the addition copolymerization reaction product of butadiene and acrylonitrile.

Claim 19

The coating composition of any of claims 12-14 wherein said addition polymerizable, ethylenically unsaturated monomers from which the modified alkyd composition is derived include a monomer having a molecular weight of at least 200 and having at least one primary and at least one secondary ethylenically unsaturated group, the monomer being present in sufficient guantity to significantly increase chip resistance.

Claim 20

The coating composition of claim 17 wherein the monomer having at least one primary and at least one secondary ethylenically unsaturated group is the reaction product of glycidyl methacrylate with an unsaturated fatty acid.

Claim 21

A cationic electrodeposition coating composition comprising, in aqueous dispersion: a. A modified alkyd composition derived from the reaction of a polyol with at least one unsaturated fatty acid and reacted with addition polymerizable ethylenically unsaturated monomers including an amine-functional unsaturated monomer in a guantity sufficient to render the coating composition water-dispersible and cationically electrodepositable; and b. A reactive agent in sufficient quantities to significantly improve the resistance to chipping of a cured coating resulting from the electrodeposition of the composition upon a metal substrate, the agent including at least one ethylenically unsaturated, addition polymerizable monomer or oligomer having a predominantly polymethylene backbone, which was a molecular weight of at least about 150 and an average of at least about 1.2 ethylenically unsaturated groups per molecule, which is polymerizable under free radical initiating conditions, and which is a polyol triacrylate or a polyol tetraacrylate.

Claim 22

A cationic electrodeposition coating composition comprising, in aqueous dispersion: a. A modified alkyd composition derived from the reaction of a polyol with at least one unsaturated fatty acid and reacted with addition polymerizable ethylenically unsaturated monomers including an amine-functional unsaturated monomer in a guantity sufficient to render the coating composition water-dispersible and cationically electrodepositable; and b. A reactive agent in sufficient quantities to significantly improve the resistance to chipping of a cured coating resulting from the electrodeposition of the composition upon a metal substrate, the agent including at least one ethylenically unsaturated, addition polymerizable monomer or oligomer having a predominantly polymethylene backbone, which was a molecular weight of at least about 150 and an average of at least about 1.2 ethylenically unsaturated groups per molecule, which is polymerizable under free radical initiating conditions, and which is a polyol triacrylate or a polyol tetraacrylate.

Claim 23

The composition of claim 19, in which the monomer or oligomer of the reactive agent is trimethylolpropane triacrylate, trimethylolethane triacrylate, or pentaerythritol.