# US 5,705,240 A · Coated metal plate for cans and seamless cans formed therefrom

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- Number: US 5,705,240 A
- Document ID: US5705240A
- Status: Granted
- Kind: A
- Application number: 08/613,450
- Filed: 1996-03-01
- Granted: 1998-01-06
- Earliest claimed: 1992-12-25
- Assignees: Toyo Seikan Kaisha, Ltd.
- Inventors: Sachiko Machii; Kenichirou Nakamaki; Masanori Aizawa; Katsuhiro Imazu
- Web page: https://patentgrep.com/patent/US5705240A

## CPC

- B32B 15/09: comprising polyesters
- B32B 1/00: Layered products having a non-planar shape
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/36: comprising polyesters
- B82Y 15/00: Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
- B32B 2307/518: bi-axially
- B32B 2307/746: Slipping, anti-blocking, low friction
- B32B 2439/66: Cans, tins
- Y10S 220/906: Beverage can, i.e. beer, soda
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1355: Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
- Y10T 428/1359: Three or more layers [continuous layer]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T 428/1393: Multilayer [continuous layer]
- Y10T 428/31678: Of metal
- 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
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A polyester laminated draw-formed can which suppresses frothing phenomenon when a carbonated beverage is contained therein and exhibits excellent corrosion resistance, and a coated metal plate used for the production of the cans. The coated metal plate for cans comprises a laminated material of a metal plate, a polyester film layer consisting chiefly of ethylene terephthalate units and, as required, an adhesive primer layer interposed between the metal plate and the polyester film, wherein the polyester film layer that is on the inner surface side of the can has a surface that is molecularly oriented in at least the biaxial directions, and larger protrusions on the surface over a visual field of 100 .mu.m.times.100 .mu.m as observed using an interatomic force microscope (AFM) have an average height (H) of three points of 0.20 .mu.m or smaller.

## Claims

### Claim 1

A seamless, froth-preventing and corrosion-resistant metal can comprising a can formed from a metal plate and a polyester film layer bonded at an inside surface of the can wherein at least a surface of said polyester film is oriented molecularly in biaxial directions so that the surface of said layer has an inplane orientation coefficient of at least 0.022 and a coarse portion selected from the surface in the can over a visual field of 100 .mu.m.times.100 .mu.m in an interatomic force microscope has a three-point average height (H) of large protrusions of 0.20 .mu.m or smaller.

### Claim 2 (depends on 1)

A seamless can according to claim 1 wherein a coarse portion is selected from the surface inside the can over a vision of 100 .mu.m.times.100 .mu.m by using an interatomic force microscope and a three-point average depth (D) of large concave portions measured on this portion is 0.02 .mu.m or smaller as measured on this portion.

### Claim 3 (depends on 1)

The seamless can according to claim 1 wherein an adhesive primer is interdisposed between said inner surface side of said metal can and said polyester film layer.

### Claim 4 (depends on 1)

The seamless can according to claim 1 wherein said polyester film layer contains an anti-blocking agent having a grain size of form 0.05 to 0.7 .mu.m.

### Claim 5 (depends on 1)

The seamless can according to claim 1 wherein said polyester film layer is a laminated film consisting of an inner layer of a polyester next to said inner surface side of said metal can, and a surface layer of a polyester on top of said inner layer containing an anti-blocking agent having a grain size of from 0.01 to 0.5 .mu.m, and .

### Claim 6

A seamless, froth-preventing and corrosion-resistant metal can obtained by reduction draw-forming or draw-ironing a laminated material of a metal plate comprising a can formed form a metal plate, a polyester film layer comprising ethylene terephthalate units, and an adhesive primer layer interposed between the metal plate and the polyester film layer, wherein a side wall of the can has a thickness residual factor of 55 to 95%, wherein at least a surface of the polyester film layer at an inside surface of the can is oriented molecularly in biaxial directions so that the surface of said layer has an inplane orientation coefficient of at least 0.022 and a coarse portion selected from the surface in the can over a visual field of 100 .mu.m.times.100 .mu.m in an interatomic force microscope has a three-point average height (H) of large protrusions of 0.20 .mu.m or smaller.