Patent ID: 8921455

Claim:
An anti-fog coating composition comprising: a copolymer (A) formed from a monomer mixture containing a monomer (A1), a monomer (A2) and a monomer (A3) shown below; a basic compound (B); and a surfactant (C), wherein: the monomer (A1) is a vinyl monomer having N-methylol group, the monomer (A2) is a vinyl monomer having sulfonic acid group selected from the group consisting of 3-sulfopropyl(meth)acrylate, 2-sulfoethyl(meth)acrylate, 2-acrylamido-2-methylpropanesulfonic acid, and a combination thereof, the monomer (A3) is an alkyl(meth)acrylate monomer in which the number of carbon atoms in the alkyl group is 1 to 4, the content of the monomer (A1) is 3 to 20 parts by mass, the content of the monomer (A2) is 3 to 20 parts by mass, the content of the monomer (A3) is 60 to 94 parts by mass, and the total of the monomer (A1) and the monomer (A2) is 6 to 40 parts by mass per 100 parts by mass as the total of the monomer (A1), the monomer (A2) and the monomer (A3), the content of the basic compound (B) is 50 to 95 mol % relative to 100 mol % of the sulfonic acid group in the monomer (A2), and the content of the surfactant (C) is 0.5 to 30 parts by mass per 100 parts by mass of the copolymer (A), a base dissociation constant of the basic compound (B) in an aqueous solution at 25° C. is 3 to 14, and a boiling point of the basic compound (B) is 130° C. to 1500° C.