TH41576A - Primer compounds for making light-activated coatings or hydrophilic coatings that are induced by photocatalysis. - Google Patents

Abstract

DC60 (10/09/42) Disclosed: A primer compound for application to a substrate to form a photocatalytic or hydrophilic coating. The primer compound consists of at least one surfactant and at least one solvent. The surfactant is a non-ionic surfactant, a fluorocarbon surfactant, or a mixture of surfactants. The solvent is a water-soluble solvent with a boiling point of 180 to 235 °C, an alcohol with 1 to 4 carbon atoms, water, or a mixture of two or more of these solvents. The primer compound forms a thin, uniform, and defect-free intermediate layer on automotive bodywork and building structures. And similar substances on the surface of organic substrates such as resins and wood, or on the surface of inorganic substrates such as glass, mirrors, lenses, and stone. What is revealed is a primer mixture for application to the substrate surface to create a primer coating on top, which will then be activated by light-catalyzed or hydrophilic coatings. The primer mixture consists of at least one surfactant and at least one solvent. The surfactant is a non-ionic surfactant, a fluoro-surfactant, or a mixture of surfactants. The solvent is a water-soluble solvent with a boiling point of 180 to 235 °C, an alcohol with 1 to 4 carbon atoms, water, or a mixture of two or more of these solvents. The primer mixture can form a thin, uniform, and defect-free intermediate layer on automotive body finishes and building structures. And other similar phenomena on the surface of organic substrates such as resins and wood, or on the surface of inorganic substrates such as glass, mirrors, lenses, and stone.

Claims (26)

1. A primer mixture for application to a substrate to create a base coat over which a photoactivated or hydrophilic coating will be applied by catalytic reaction on the primer. Such primer mixture contains at least one surfactant and at least one solvent. The surfactant is a nonionic surfactant, a fluorosoluble surfactant, or a mixture of them. The solvent is a water-soluble solvent with a boiling point of 180 to 235 °C, an alcohol with 1 to 4 carbon atoms, water, or a mixture of two or more of these solvents. 2. A primer coating mixture as defined in Claim 1, which includes an additional component consisting of colloidal silica. 3. Primer mixtures as defined in Requisition 1 or 2, in which a nonionic surfactant has a clouding point of 0 to 100 °C as measured in a 2% by weight solution in water. 4. Primer mixtures as defined in any one of the claims of Claims 1 through 3, whereby the solvent is a mixed solvent consisting of a water-soluble solvent with a boiling point of 180 to 235 °C and an alcohol with 1 to 4 carbon atoms, or a mixed solvent consisting of a water-soluble solvent with a boiling point of 180 to 235 °C, an alcohol with 1 to 4 carbon atoms, and water. 5. A primer mixture as defined in one of the claims of claims 1 through 4, which contains 0.05 to 2.0 percent by weight of surfactants and no more than 99.95 percent by weight of solvents. 6. A primer mixture as defined in one of the claims of claims 2 through 5, which contains 0.04 to 2.0 percent by weight of colloidal silica. 7. A primer mixture as defined in any one of the claims in Claims 1 through 6, which contains 0.5 to 5 percent by weight of a water-soluble solvent with a boiling point of 180 to 235 degrees Celsius. 8. Primer mixtures as defined in any one of the claims of claims 1 through 7, whereby the non-ionic surfactant is a non-ionic polyethylene glycol surfactant which is a product of the combination reaction between alkylene oxide and a high molecular weight alcohol or alkylphenol. 9. A primer mixture as defined in any one of the claims of claims 1 through 7, whereby a non-ionic surfactant is an organopolysiloxane modified with polyether. 10. Primer coating mixtures as defined in any one of the claims of claims 1 through 9, in which a photoactivatable coating or a photocatalytic hydrophilic coating is hydrophilicized by a photocatalytic hydrophilic reaction. 11. Primer coating mixtures as defined in any one of the claims of claims 1 through 9, in which a light-activated coating or a photocatalytic hydrophilic coating contains titanium oxide in the form of anatase. 12. A primer mixture as defined in any one of the claims in Claims 1 through 11, where the substrate is an organic substrate. 13. A primer coating mixture as defined in any one of the claims in Claims 1 through 11, whereby the substrate is the coated material. 14. A primer mixture as defined in any one of the claims in Claims 1 through 11, where the substrate is the car body. 15. A primer mixture as defined in any one of the claims in Claims 1 through 11, where the substrate is a resin. 16. Primer mixtures as defined in any one of the claims of Claims 1 through 11, where the substrate is an inorganic substrate. 17. A primer mixture as defined in any one of the claims in Claims 1 through 11, where the substrate is glass. 18. A primer mixture as defined in any one of the claims in Claims 1 through 11, where the substrate is mirror glass. 19. A primer coating mixture as defined in any one of the claims in Claims 1 through 11, where the substrate is a lens. 20. A primer mixture as defined in any one of the claims in Claims 1 through 11, where the substrate is stone. 21. A method for producing photoactivated or photocatalytic hydrophilic coatings, consisting of the following steps: applying a primer mixture of one of the claims of Patents 1 through 20 onto a substrate; drying the applied mixture; applying a mixture capable of forming a photoactivated or photocatalytic hydrophilic coating onto the dried coating; and curing the applied mixture. 22. The method as defined in Claim 21, in which a mixture capable of being formed into a photoactivated coating or a hydrophilic coating by photocatalysis consists of: a metal oxide photocatalytic particle; a limitedly degradable binder composed of at least one selected compound from a group of fine silica particles; a silicone resin film precursor capable of being formed into a silicone resin film; and a silica film precursor capable of being formed into a silica film; and a solvent. 23. The method specified in Claim 22, in which the substrate of the silicone resin film is siloxane, is represented by the formula of the average composition as follows: RpSiXqO(4-p-q)/2, where R represents a selectable element consisting of one or more hydrogen atoms and organic groups, X represents an alkoxy group or a halogen atom, P is the number that satisfies O < p < 2, and q is the number that satisfies O < q < 4. 24. The method specified in claim 22, in which the silica-based enamel substrate is a silicate that can be represented by the formula of the average element as follows: SiXqO(4-q)/2, where X represents the alkoxy group or halogen atom and q is the number that satisfies O < q < 4. 25. A material consisting of a substrate, a primer coating on the substrate, and a photocatalytic hydrophilic coating, where the primer coating is made using a primer coating mixture of any one of the claims 1 through 20. 26. Materials as defined in Claim 25, of which the underlying materials are the vehicle body, glass and coated surfaces.