Patent ID: 9296919
Filing Date: 2016-03-29
CPC Classification: B05D,C08K,C08L,C09D,Y10T

Claim Text:
1. A chromate-free black-coated metal plate characterized by comprising a metal sheet on at least one surface of which is formed a black coating (α), comprising a polyester resin (A1) containing sulfonic acid groups cured by a curing agent (B) and carbon black (C), of a thickness of 2 to 10 μm, wherein said black coating (α) is formed by coating a water-based black paint containing said polyester resin (A1) containing sulfonic acid groups, said curing agent (B), and said carbon black (C) on said metal sheet, forming a coated metal sheet, and heating the coated metal sheet to dry, characterized in that when a content of said carbon black (C) in said black coating (α) is X mass % and a thickness of said black coating (α) is Y μm, X×Y≧20 and 4≦X≦15 are satisfied, wherein a content of the polyester resin (A1) is 33-78 mass % with respect to the mass of the black coating (α), and a content of the curing agent (B) is 5 to 35 mass % with respect to the total organic resin in the black coating (α), wherein said black coating (α) further comprises a lubricant (E) consisting of polyethylene resin particles dispersed in said black coating (α) in the form of particles of a number average particle size of 0.15 to 1 μm, wherein said curing agent (B) is selected from a melamine resin and/or a polyisocyanate compound, and wherein said carbon black is selected from the group consisting of furnace black ketjen black, acetylene black, and channel black.