Aqueous coating composition
AssigneeThe Valspar Corporation
InventorsMary Jo Chutko, Phillip C. Martino
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Abstract
An aqueous coating composition and a method of coating a metal substrate are provided. The composition and method are particularly suitable for use in coating can bodies and can ends or for can side seam coatings. The coating composition includes a solvent component and a film forming component. The solvent component includes water and an organic solvent. The film forming component includes a curing agent and the product of the reaction of a carboxy addition polymer and an epoxy resin in the presence of a tertiary amine catalyst.
Claims28
An aqueous coating composition comprising:
- at least about 50 wt. % of a solvent component, based on the total weight of the coating composition, which includes at least about 70 wt. % water, based on the total weight of the solvent component, and an organic solvent;
- and
- at least about 30 wt. % of a film forming component, based on the total weight of the coating composition, which includes:
- A) a carboxy addition polymer having an acid number of at least about 165 and a glass transition temperature of no more than about 110.degree. C.;
- B) an epoxy resin having an epoxide equivalent wt. of about 1000 to about 5000;
- wherein the carboxy addition polymer and the epoxy resin are reacted in the presence of about 0.35 to about 1.0 equivalents of a tertiary amine per equivalent of carboxy groups present in the carboxy addition polymer.
An aqueous coating composition comprising a film forming component which includes:
- A) a product formed by reacting a carboxy addition polymer and an epoxy resin in the presence of a tertiary amine, wherein the carboxy addition polymer has a glass transition temperature of no more than about 110.degree. C.;
- and
- B) a phenoplast resin having a melting point of no
- more than about 100.degree. C.
An aqueous coating composition comprising:
- a solvent component which includes water and an organic solvent;
- and
- a film forming component which includes:
- A) a product formed by reacting a carboxy addition polymer and an epoxy resin in the presence of about 0.35 to about 1.0 equivalents of a tertiary amine per equivalent of carboxy groups present in the carboxy addition polymer, the carboxy addition polymer having an acid number of at least about 165 and a glass transition temperature of no more than about 110.degree. C;
- and
- B) a phenoplast resin having a melting point of no more than about 100.degree. C.;
- wherein said film forming component includes at least about 10 wt. % of the carboxy addition polymer, at least about 40 wt. % of the epoxy resin, and at least about 2 wt. % of the phenoplast resin, based on the total weight of the carboxy addition polymer plus the epoxy resin plus the phenoplast resin.
Dependencies are inferred from the claim text.