RESIN-COATED ALUMINUM ALLOY SHEET AND FORMED BODY USING RESIN-COATED ALUMINUM ALLOY SHEET

• US 20100260953A1
• Filed: 05/30/2008
• Published: 10/14/2010
• Est. Priority Date: 05/31/2007
• Status: Active Grant

• Current Assignee: TOYO Seikan Kaisha Limited (Toyo Seikan Group Holdings, Ltd.)
• Original Assignee: TOYO Seikan Kaisha Limited (Toyo Seikan Group Holdings, Ltd.)
• Inventors: Tadaki, Yasufumi, Ichinose, Syozo
• Granted Patent: US 9,410,251 B2
• Time in Patent Office: Days
• US Class Current: 428/35.700
• CPC Class Codes: B05D 2202/25 based on Al
• CPC Class Codes: B05D 2701/10 withstanding draw and redraw process, punching
• CPC Class Codes: B05D 7/51 One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating pretreatment of metallic substrates C23C; pretreatment before coating in general B05D3/00
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: C09D 5/082 characterised by the anti-corrosive pigment
• CPC Class Codes: C09D 5/084 Inorganic compounds
• CPC Class Codes: C23C 22/34 containing fluorides or complex fluorides
• CPC Class Codes: C23C 22/83 Chemical after-treatment
• CPC Class Codes: C23C 26/02 applying molten material to the substrate
• CPC Class Codes: C23C 28/00 Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/31678 Of metal
• CPC Class Codes: Y10T 428/31681 Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]

Abstract

A resin-coated aluminum alloy sheet which has a chromium-free surface treatment layer and has a coating film formed by applying an organic resin, and which exhibits excellent adhesiveness and excellent corrosion resistance even after being subject to severe forming such as drawing is provided. A resin-coated aluminum alloy sheet includes: an aluminum substrate having a surface treatment film on at least one surface thereof; and an organic resin film layer formed on the surface of the aluminum substrate. The surface treatment film includes 2 mg/m² to 100 mg/m² of zirconium in terms of metal atoms and at least any one of a polyitaconic acid, monosaccharide alcohol and disaccharide alcohol as an aluminum-ion-trapping agent.

Claims

1. A resin-coated aluminum alloy sheet comprising:

an aluminum substrate having a surface treatment film on at least one surface thereof; and

an organic resin film layer formed on the surface of the aluminum substrate, wherein

the surface treatment film includes 2 mg/m2 to 100 mg/m2 of zirconium in terms of metal atoms and at least one of a group consisting of a polyitaconic acid, monosaccharide alcohol and disaccharide alcohol as an aluminum-ion-trapping agent.

2. A resin-coated aluminum alloy sheet according to claim 1, wherein the monosaccharide alcohol is sorbitol.

3. A resin-coated aluminum alloy sheet according to claim 1, wherein the monosaccharide alcohol is maltitol.

4. A resin-coated aluminum alloy sheet according to claim 1, wherein the surface treatment film is a film which contains 0.5 to 20 mg/m2 of aluminum-ion-trapping agent in terms of organic carbon content derived from the aluminum-ion-trapping agent.

5. A resin-coated aluminum alloy sheet according to claim 1, wherein the organic resin film layer is a thermoplastic resin film layer.

6. A resin-coated aluminum alloy sheet according to claim 1, wherein the organic resin film layer is a coating film.

7. A resin-coated aluminum alloy sheet according to claim 1, wherein the organic resin film layer is a thermoplastic resin film layer which is adhered to the surface of the aluminum substrate by way of an adhesion primer.

8. A resin-coated aluminum alloy sheet according to claim 5, wherein the thermoplastic resin film layer is a polyester film layer.

9. A formed body which is formed using the resin-coated aluminum alloy sheet according to claim 1.

10. A formed body according to claim 9, wherein the formed body is a can lid.

11. A formed body according to claim 9, wherein the formed body is a can body.