RESIN-COATED METAL SHEET AND FORMED BODY USING RESIN-COATED METAL SHEET

• US 20100215965A1
• Filed: 05/30/2008
• Published: 08/26/2010
• Est. Priority Date: 05/31/2007
• Status: Abandoned Application

• Current Assignee: TOYO Seikan Kaisha Limited (Toyo Seikan Group Holdings, Ltd.)
• Original Assignee: TOYO Seikan Kaisha Limited (Toyo Seikan Group Holdings, Ltd.)
• Inventors: Ichinose, Syozo, Tadaki, Yasufumi
• Application Number:
  US12/600,710
• Publication Number:
  US 20100215965A1
• Time in Patent Office: Days
• US Class Current: 428/418
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2255/06 on metal layer
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2255/28 Multiple coating on one surface
• CPC Class Codes: B32B 2270/00 Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/50 having particular mechanical properties
• CPC Class Codes: B32B 2307/714 Inert, i.e. inert to chemical degradation, corrosion
• CPC Class Codes: B32B 2435/02 for containers
• CPC Class Codes: B32B 2439/66 Cans, tins
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 27/16 specially treated, e.g. irradiated
• CPC Class Codes: B32B 27/28 comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/302 comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 : comprising polyamides
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 27/365 : comprising polycarbonates
• CPC Class Codes: B32B 5/147 : by treatment of the layer
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C09D 133/02 : Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: Y10T 428/31529 : Next to metal
• CPC Class Codes: Y10T 428/31605 : Next to free metal
• 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.]
• CPC Class Codes: Y10T 428/31692 : Next to addition polymer from unsaturated monomers

Abstract

A resin-coated metal sheet having excellent corrosion resistance and excellent adhesiveness which has a chromium-free surface treatment layer and exhibits excellent adhesiveness and excellent corrosion resistance even after being subject to severe forming such as deep drawing after formation of an organic resin film on the surface treatment layer is provided. A resin-coated metal 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 by way of an adhesive layer. The adhesive layer contains a cationic-group containing resin and a water-based resin. A formed body such as a can body or a can lid which is formed by using such a resin-coated metal sheet is also provided.

Claims

1. A resin-coated metal sheet having excellent corrosion resistance and excellent adhesiveness comprising:

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

an organic resin film layer formed on the surface of the aluminum substrate by coating by way of an adhesive layer, wherein

the adhesive layer contains a cationic-group containing resin and a water-based resin.

2. A resin-coated metal sheet according to claim 1, wherein the cationic-group containing resin contains not less than 5.0 meq/g of cationic group in a resin solid content thereof.

3. A resin-coated metal sheet according to claim 1, wherein the cationic-group containing resin is polyallylamine and/or polylysine.

4. A resin-coated metal sheet according to claim 1, wherein the water-based resin includes at least one of an acrylic resin, a urethane resin, a polyester resin, a phenol resin and an epoxy resin.

5. A resin-coated metal sheet according to claim 4, wherein the acrylic resin is an oxazoline-group containing acrylic resin which contains at least two oxazoline-groups in one molecule thereof.

6. A resin-coated metal sheet according to claim 1, wherein the surface treatment film is a chemical conversion treatment film.

7. A resin-coated metal sheet according to claim 6, wherein the chemical conversion treatment film is an organic/inorganic chemical conversion treatment film.

8. A resin-coated metal sheet according to claim 7, wherein the organic/inorganic chemical conversion treatment film includes 2 mg/m2 to 100 mg/m2 of zirconium in terms of metal atoms and a polyitaconic acid.

9. A resin-coated metal sheet according to claim 7, wherein the organic/inorganic chemical conversion treatment film includes 0.5 mg/m2 to 20 mg/m2 of organic carbon derived from a polyitaconic acid in terms of organic carbon content.

10. A resin-coated metal sheet according to claim 1, wherein the organic resin film layer is a polyester film.

11. A formed body characterized by being formed using the resin-coated metal sheet according to claim 1.

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

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