Composite film and method of manufacturing surface coating material

摘要

A composite film for forming a resinous coating film on a surface of a to-be-coated material. The composite film has at least one of water-soluble resinous coating films, at least one of which is formed on a surface of the composite film which is brought into contact with the surface of the to-be-coated material closely and a base sheet to which the water-soluble resinous coating film adheres and transmits light therethrough. The water-soluble resinous coating film formed on the surface of the composite film which is brought into contact with the surface of the to-be-coated material closely is hardened in close contact with the to-be-coated material, with water interposed between the water-soluble resinous coating film and the to-be-coated material and adheres to the to-be-coated material to form a water-insoluble coating film. It is preferable that the application amount of the water is in a range of 1.5g/m<2>- 10g/m<2>. It is preferable that at least one layer of water-insoluble resinous coating film is interposed between the base sheet and the water-soluble resinous coating film. It is preferable that polyethylene-imine and polyvinyl alcohol is contained in the water-soluble resinous coating film or the water.