Lead-free electrodeposition coating composition and coated article
AssigneesHonda Motor Co., Ltd., Nippon Paint Co., Ltd.
InventorsHiroyuki Morishita, Katsuyoshi Kaneko, Fumiaki Niisato, Toshiyuki Ishii, Kageki Fujimoto
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Abstract
The present invention relates to a cationic electrodeposition coating composition substantially free of lead compounds, which is excellent in curability and can be finish-coated with a splendid appearance, and an article coated with the composition. The invention provides a lead-free electrodeposition coating composition excellent in curability and a coated article, the composition being capable of forming a coating film, which emits less tin compounds to have no influence on appearance of a finish coating film and film performances.
Claims9
A lead-free cationic electrodeposition coating composition comprising:
- a binder resin and one or more organotin compounds as a curing catalyst, wherein the binder resin comprises a cationic base resin and a cross linking agent, a mass ratio of the one or more organotin compounds to solid contents of the binder resin is approximately 0.1 to 10% by mass, and the organotin compounds comprise more than approximately 50% by mass of a monoalkyltin compound based on the total mass of the one or more organotin compounds.
A coated article comprising:
- a substrate and an electrodeposition coating film formed on the substrate,
- wherein the electrodeposition coating film comprises a lead-free cationic electrodeposition coating composition which comprises a binder resin and one or more organotin compounds as a curing catalyst,
- wherein the binder resin comprises a cationic base resin and a cross linking agent, a mass ratio of the one or more organotin compounds to solid contents of the binder resin is approximately 0.1 to 10% by mass, and
- wherein the organotin compounds comprise more than approximately 50% by mass of a monoalkyltin compound based on the total mass of the one or more organotin compounds.
A lead-free cationic electrodeposition coating composition comprising:
- a binder resin and one or more organotin compounds as a curing catalyst,
- wherein the binder resin comprises a cationic base resin and a cross linking agent, a mass ratio of the one or more organotin compounds to solid contents of the binder resin is approximately 0.1 to 10% by mass, and the organotin compounds comprise more than approximately 50% by mass of a monoalkyltin compound based on the total mass of the one or more organotin compounds.
- wherein the lead-free cationic electrodeposition coating composition comprises approximately 100 to 2,000 ppm of zinc ions. and
- wherein the cationic base resin is an amino-epoxy resin, and the monoalkyltin compound is monobutyltin oxide.
A coated article comprising:
- a substrate and an electrodeposition coating film formed on the substrate,
- wherein the electrodeposition coating film comprises and lead-free cationic electrodeposition coating composition which comprises a binder resin and one or more organotin compounds as a curing catalyst,
- wherein the binder resin comprises a cationic base resin and a cross linking agent, a mass ratio of the one or more organotin compounds to solid contents of the binder resin is approximately 0.1 to 10% by mass, and the organotin compounds comprise more than approximately 50% by mass of a monoalkyltin compound based on the total mass of the one or more organotin compounds.
- wherein the lead-free cationic electrodeposition coating composition comprises approximately 100 to 2,000 ppm of zinc ions. and
- wherein the cationic base resin is an amino-epoxy resin, and the monoalkyltin compound is monobutyltin oxide.
Dependencies are inferred from the claim text.