Primer system
AssigneeAmerican Can Company
InventorStanley E. Rohowetz
Life of this patent
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Abstract
An ultraviolet treatment of organic titanates on metal surfaces to increase adhesion of inks and coatings is disclosed wherein the adhesion of subsequently applied inks and coatings is improved. The method includes an initial treatment of the lubricated metal substrate with an organic titanate such as tetrakis (2-ethyl hexyl) titanate and then exposing same to ultraviolet light to accelerate the reaction of the titanate with the metal surface.
Claims16
An applied primer covering a lightly lubricated metal substrate including various metals and their oxides to form a surface for receiving a subsequently applied coating said primer consisting essentially of a thin film of organic titanate treated momentarily with ultraviolet radiation.
A method of priming a lightly lubricated sheet of electrolytic tinplate without removing the lubricant for preparing it to receive a post coating including the steps of:
- a. dipping said strip in a titanate-heptane solution sufficient to lightly coat the surface with the solution;
- b. permitting the solvent to evaporate leaving a titanate film over the surface, and
- c. momentarily exposing the surface to ultraviolet light at a watt density sufficient to photo-activate the titanate surface coating.
A method for applying a titanate primer to lightly lubricated tinplate without removing the lubricant for preparing it to receive a subsequent applied coating including the steps of:
- a. charging the primer with an electrostatic charge while atomizing same for dispersion;
- b. charging the tinplate with an electrostatic charge of opposite polarity to that impressed upon the primer;
- c. dispersing the charged and atomized primer toward the tinplate to coat same, and
- d. subjecting the coated tinplate to a brief exposure of ultraviolet radiation to photo-activate the surface.
A method for applying a primer including a titanate and a ester-type lubricant to tinplate for preparing it to receive a subsequently applied coating including the steps of:
- a. charging the primer with an electrostatic charge while atomizing same for dispersion;
- b. charging the primer with an electrostatic charge while atomizing same for dispersion;
- c. dispersing the charged and atomized primer toward the tinplate to coat same, and
- d. subjecting the coated tinplate to a brief exposure of ultraviolet radiation to photo-activate the surface.
Dependencies are inferred from the claim text.