Surface-treated aluminum plate, organic-resin-coated surface -treated aluminum plate, can body and can lid formed by using the same

Abstract

A surface-treated aluminum plate obtained by forming, on at least one surface of an aluminum plate, a conversion-coated layer that contains a polyester resin and a zirconium compound or a titanium compound. The surface-treated aluminum plate excellently adheres to an organic resin coating and can be used as a material for producing cans featuring excellent corrosion resistance and shock resistance.

1 . A surface-treated aluminum plate obtained by forming, on at least one surface of an aluminum plate, a conversion-coated layer that contains a polyester resin and a zirconium compound or a titanium compound. 
     
     
         2 . The surface-treated aluminum plate according to  claim 1 , wherein the ratio C/M of the amount C of carbon and the amount M of zirconium or titanium in said conversion-coated layer lies in a range of 1 to 80. 
     
     
         3 . The surface-treated aluminum plate according to  claim 1 , wherein said conversion-coated layer contains a polycarboxylic acid. 
     
     
         4 . The surface-treated aluminum plate according to  claim 3 , wherein said conversion-coated layer contains a metal chelate complex that comprises aluminum ions, zirconium ions or titanium ions and the polycarboxylic acid. 
     
     
         5 . The surface-treated aluminum plate according to  claim 1 , wherein said conversion-coated layer contains a particulate component. 
     
     
         6 . The surface-treated aluminum plate according to  claim 3 , wherein the ratio C/M of the amount C of carbon and the amount M of zirconium or titanium lies in a range of 1 to 40 in said conversion-coated layer. 
     
     
         7 . The surface-treated aluminum plate according to  claim 5 , wherein said particulate component comprises water-dispersible crosslinked particles of a copolymer of a methyl poly(meth)acrylate or a copolymer of a methyl poly(meth)acrylate and a poly(meth)acrylic acid, or comprises particles of an inorganic silica compound. 
     
     
         8 . The surface-treated aluminum plate according to  claim 5 , wherein said particulate component has a particle size in a range of 1 to 200 nm. 
     
     
         9 . An organic resin-coated surface-treated aluminum plate obtained by forming an organic resin coating on the conversion-coated layer of the surface-treated aluminum plate of  claim 1 . 
     
     
         10 . A can body formed from the organic resin-coated surface-treated aluminum plate of  claim 9 . 
     
     
         11 . A can lid formed from the organic resin-coated surface-treated aluminum plate of  claim 9 . 
     
     
         12 . A surface-treating solution for treating the surface of an aluminum plate by a conversion treatment, the surface-treating solution containing a water-dispersible polyester resin and fluorine ions, zirconium ions or titanium ions. 
     
     
         13 . The surface-treating solution according to  claim 12 , wherein said polyester resin is contained in an amount of 100 to 10,000 ppm, and said zirconium ions or said titanium ions are contained in an amount of 5 to 5,000 ppm. 
     
     
         14 . The surface-treating solution according to  claim 12 , wherein a polycarboxylic acid and/or a water-dispersible particulate component is contained. 
     
     
         15 . The surface-treating solution according to  claim 14 , wherein said polyester resin is contained in an amount of 500 to 10,000 ppm, said water-dispersible particulate component is contained in an amount of 100 to 3,000 ppm, said polycarboxylic acid is contained in an amount of 5 to 2,000 ppm, and said zirconium ions or said titanium ions are contained in an amount of 5 to 5,000 ppm.