# US 8,465,815 B2 · Resin-coated metal sheet and seamless can made therefrom

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- Number: US 8,465,815 B2
- Document ID: US8465815B2
- Status: Granted
- Kind: B2
- Application number: 13/147,765
- Filed: 2010-04-02
- Published: 2012-01-26
- Granted: 2013-06-18
- Earliest claimed: 2009-04-08
- Assignees: Toyo Seikan Kaisha, Ltd.
- Applicants: Seitaro Kanazawa; Shigeya Takahashi; Tomoko Haraguchi
- Inventors: Seitaro Kanazawa; Shigeya Takahashi; Tomoko Haraguchi
- Web page: https://patentgrep.com/patent/US8465815B2

## CPC

- B32B 15/09: comprising polyesters
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/36: comprising polyesters
- B65D 1/12: Cans, casks, barrels, or drums
- B65D 1/40: Details of walls (other container details B65D23/00, B65D25/00)
- C09D 167/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence)
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/518: bi-axially
- B32B 2307/554: Wear resistance
- B32B 2307/704: Crystalline
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2307/732: Dimensional properties
- B32B 2307/75: Printability
- Y10T 428/1348: Cellular material derived from plant or animal source [e.g., wood, cotton, wool, leather, etc.]
- Y10T 428/1359: Three or more layers [continuous layer]
- Y10T 428/31681: Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

[Problems] To provide a resin-coated metal sheet that exhibits excellent trimming property at the time of being formed into a seamless can, and is capable of providing a seamless can that closely adheres to the printing ink and exhibits excellent abrasion resistance. [Means for Solution] A resin-coated metal sheet including a metal sheet and a layer of a polyester resin which chiefly comprises an ethylene terephthalate unit formed on at least one surface of the metal sheet, wherein the polyester resin is a blend of a lowly crystalline polyester resin and a highly crystalline polyester resin.

## Claims

### Claim 1

A resin-coated metal sheet including a metal sheet and a layer of a polyester resin coating the metal sheet, the polyester resin chiefly comprising an ethylene terephthalate unit formed on at least one surface of the metal sheet, wherein said polyester resin is a blended polyester resin comprising a blend of a lowly crystalline polyester resin and a highly crystalline polyester resin, wherein said highly crystalline polyester resin is a homopolyethylene terephthalate or a polyethylene terephthalate containing isophthalic acid in an amount of not larger than 3 mol %, and said lowly crystalline polyester resin is a polyethylene terephthalate containing isophthalic acid in an amount of 12 to 18 mol %.

### Claim 2 (depends on 1)

The resin-coated metal sheet according to claim 1, wherein the blended polyester resin contains an isophthalic acid in an amount of 5 to 13 mol %.

### Claim 3 (depends on 1)

The resin-coated metal sheet according to claim 1, further comprising a lower layer formed on at least one surface of said metal sheet, the surface layer comprising said blended polyester resin of a blend of said highly crystalline polyester resin and said lowly crystalline polyester resin, and said lower layer comprising a polyester resin containing the isophthalic acid in an amount of 10 to 18 mol %.

### Claim 4 (depends on 1)

The resin-coated metal sheet according to claim 1, wherein said metal sheet is an aluminum sheet.

### Claim 5 (depends on 1)

A seamless can made from the resin-coated metal sheet of claim 1, wherein the layer of the blended polyester resin comprising a blend of said highly crystalline polyester resin and said lowly crystalline polyester resin is an outer coating of the seamless can, and a printed layer is formed on said blended polyester resin layer.