Water-based coating composition curable with actinic energy ray, coated metallic material, and process for producing the same

2:

• The radiation curable aqueous coating composition according to claim 1, wherein the phosphoric acid ester compound having an ethylenically unsaturated double bond comprises phosphoric acid esters having a (meth)acryloyloxy group represented by the General Formula (1):
• 3
• (wherein R1 represents a hydrogen atom or a methyl group, R2 represents an alkyl group having 1 to 8 carbon atoms, k represents an integer of 2 to 12, n represents an integer of 0 to 3, a+b+c=3, a represents an integer of 1 to 3, and b represents an integer of 0 to 2).

3:

• The radiation curable aqueous coating composition according to claim 1, wherein a portion or all of a polyisocyanate component of the aqueous polyurethane resin is dicyclohexylmethane-4,4′-diisocyanate.

4:

• The radiation curable aqueous coating composition according to claim 1, wherein a portion of a polyol component of the aqueous polyurethane resin is polytetramethylene glycol.

5:

• The radiation curable aqueous coating composition according to claim 1, wherein the colloidal silica is surface-treated with aluminum.

6:

• A coated metal material comprising a metal material and a coating film formed on the surface of the metal material, the coating film being formed by curing the radiation curable aqueous coating composition of any one of claims 1 to 5 with radiation.

7:

• The coated metal material according to claim 6, wherein the metal material is a metal material with a coating agent on the surface thereof.

8:

• The coated metal material according to claim 7, wherein the coating agent is zinc, an alloy of zinc and another metal, or a zinc compound.

9:

• The coated metal material according to claim 8, wherein the metal material is a non-chromated steel sheet.

10:

• A method for manufacturing a coated metal material, comprising the steps of applying the radiation curable aqueous coating composition of any one of claims 1 to 5 on the surface of a metal material, vaporizing a solvent component in the coating composition to form a coating film, and irradiating the coating film with radiation.

A radiation curable aqueous coating composition comprising:

• (1) a phosphoric acid ester compound having an ethylenically unsaturated double bond,
• (2) an aqueous polyurethane resin having both an ethylenically unsaturated double bond and a group capable of forming a salt, and
• (3) colloidal silica which has been surface-treated with aluminum.

A radiation curable aqueous coating composition comprising:

• (1) a phosphoric acid ester compound having an ethylenically unsaturated double bond,
• (2) an aqueous polyurethane resin derived from monohydroxy di(meth)acrylate and having both an ethylenically unsaturated double bond and a group capable of forming a salt, and
• (3) colloidal silica.