# US 2016/0355294 A1 · Resin-coated metal sheet for container and method for manufacturing the same

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- Number: US 2016/0355294 A1
- Document ID: US20160355294A1
- Status: Published application
- Kind: A1
- Application number: 15/118,275
- Filed: 2015-02-17
- Published: 2016-12-08
- Earliest claimed: 2014-02-21
- Assignees: Jfe Steel Corporation
- Applicants: Jfe Steel Corporation
- Inventors: Yoichiro Yamanaka; Junichi Kitagawa; Hiroki Nakamaru
- Web page: https://patentgrep.com/patent/US20160355294A1

## CPC

- B65D 1/165: {Cylindrical cans}
- B05D 1/02: performed by spraying
- B05D 1/28: performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- B05D 7/54: {No clear coat specified}
- B32B 1/00: Layered products having a non-planar shape
- B32B 15/00: Layered products comprising {a layer of} metal
- B32B 15/04: comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)}
- B32B 15/08: of synthetic resin
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 27/00: Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)}
- B32B 27/08: of synthetic resin
- B32B 27/26: using curing agents
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/42: comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
- B05D 2252/10: Applying the material on both sides
- B32B 37/04: characterised by the partial melting of at least one layer
- B32B 37/06: characterised by the heating method
- B32B 37/08: characterised by the cooling method
- B32B 37/206: {Laminating a continuous layer between two continuous plastic layers}
- B32B 2255/00: Coating on the layer surface
- B32B 2255/06: on metal layer
- B32B 2255/205: Metallic coating
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2307/518: bi-axially
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2307/7244: Oxygen barrier
- B32B 2307/7246: Water vapor barrier
- B32B 2307/732: Dimensional properties
- B32B 2307/75: Printability
- B32B 2309/02: Temperature
- B32B 2311/30: Iron, e.g. steel
- B32B 2439/00: Containers; Receptacles
- B32B 2439/66: Cans, tins
- B32B 2439/70: Food packaging
- 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
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

Provided is a resin-coated metal sheet for a container having a resin layer (A) having a multi-layer structure containing polyester as a main component on an inner-surface side of the container when the metal sheet is formed into the container. The resin layer (A) contains terephthalic acid in an amount of 85 mol % or more, the resin layer (A) has at least two layers including an uppermost resin layer (a1) which comes into contact with contents and contains wax compounds in an amount of 0.10 mass % or more and 2.0 mass % or less with respect to the uppermost resin layer (a1), with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), the maximum value of the peak intensity ratio (IMD/IND) of peak intensity in a longitudinal direction to peak intensity in a thickness direction is 1.0 or more and 4.0 or less, a thickness of the uppermost resin layer (a1) is 0.5 μm or more and 10 μm or less, and a thickness of the resin layer (A) excluding the thickness of the uppermost resin layer (a1) is 5 μm or more and 20 μm or less.

## Claims

### Claim 1

A resin-coated metal sheet for a container, comprising a metal sheet and a resin layer (A) having a multi-layer structure containing polyester as a main component on an inner-surface side of the container when the metal sheet is formed into the container, wherein
1) the resin layer (A) contains terephthalic acid in an amount of 85 mol % or more,
2) the resin layer (A) has at least two layers including an uppermost resin layer (a1) which comes into contact with contents and contains wax compounds in an amount of 0.10 mass % or more and 2.0 mass % or less with respect to the uppermost resin layer (a1),
3) with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a peak intensity ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less,
4) the uppermost resin layer (a1) has a thickness of 0.5 μm or more and 10 μm or less, and 5) the resin layer (A) excluding the thickness of the uppermost resin layer (a1) has a thickness of 5 μm or more and 20 μm or less.

### Claim 2 (depends on 1)

The resin-coated metal sheet for a container according to claim 1, wherein the wax compounds contain a carnauba wax.

### Claim 3 (depends on 1)

The resin-coated metal sheet for a container according to claim 1, further comprising a resin layer (B) having a multi-layer structure containing polyester as a main component on an outer-surface side of the container when the metal sheet is formed into the container, wherein a resin layer (b1) which comes into contact with the metal sheet contains components described in (I) through (V) below:
(I) a polyester resin,
(II) a phenol resin,
(III) a metal alkoxide-based compound and/or metal chelate compound,
(IV) an epoxy resin, and
(V) at least one selected from the group consisting of a polyamine resin, a polyamide amine resin, and a polyamide resin.

### Claim 4 (depends on 3)

The resin-coated metal sheet for a container according to claim 3, wherein the resin layer (B) has the resin layer (b1) and a polyester film (b2) formed on the resin layer (b1).

### Claim 5 (depends on 3)

The resin-coated metal sheet for a container according to claim 3, wherein contents of the resin components of the resin layer (b1) satisfy the conditions below:
(I) polyester resin: 50 mass % or more and 89 mass % or less,
(II) phenol resin: 10 mass % or more and 45 mass % or less,
(III) metal alkoxide-based compound and/or metal chelate compound: 0.01 mass % or more and 10 mass % or less,
(IV) epoxy resin: 0.5 mass % or more and 20 mass % or less, and
(V) at least one selected from the group consisting of a polyamine resin, a polyamide amine resin, and a polyamide resin: 0.1 mass % or more and 10 mass % or less.

### Claim 6 (depends on 4)

The resin-coated metal sheet for a container according to claim 4, wherein
a resin in the resin layer (b2) is a composition derived by mixing a polyester (i) containing polyethylene terephthalate or copolymerized polyethylene terephthalate containing less than 6 mol % of copolymerization components and a polyester (ii) containing polybutylene terephthalate or copolymerized polybutylene terephthalate containing less than 5 mol % of copolymerization components, and
a content of the polyester (i) is 60 mass % or less and a content of the polyester (ii) is 40 mass % or more.

### Claim 7 (depends on 3)

The resin-coated metal sheet for a container according to claim 3, wherein the resin layer (B) contains wax compounds in an amount of 5.0 mass % or less with respect to the resin layer (B).

### Claim 8 (depends on 7)

The resin-coated metal sheet for a container according to claim 7, wherein
in the resin layer (B), the resin layer (b1) excluding the uppermost layer and the uppermost resin layer (b2) contain wax compounds or the uppermost resin layer (b2) contains wax compounds, and
the uppermost resin layer (b2) contains wax compounds in an amount of 5.0 mass % or less with respect to the uppermost resin layer (b2).

### Claim 9 (depends on 7)

The resin-coated metal sheet for a container according to claim 7, wherein the wax compounds contain a carnauba wax.

### Claim 10 (depends on 1)

A method for manufacturing the resin-coated metal sheet for a container according to claim 1, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 11 (depends on 2)

The resin-coated metal sheet for a container according to claim 2, further comprising a resin layer (B) having a multi-layer structure containing polyester as a main component on an outer-surface side of the container when the metal sheet is formed into the container, wherein a resin layer (b1) which comes into contact with the metal sheet contains components described in (I) through (V) below:
(I) a polyester resin,
(II) a phenol resin,
(III) a metal alkoxide-based compound and/or metal chelate compound,
(IV) an epoxy resin, and
(V) at least one selected from the group consisting of a polyamine resin, a polyamide amine resin, and a polyamide resin.

### Claim 12 (depends on 4)

The resin-coated metal sheet for a container according to claim 4, wherein contents of the resin components of the resin layer (b1) satisfy the conditions below:
(I) polyester resin: 50 mass % or more and 89 mass % or less,
(II) phenol resin: 10 mass % or more and 45 mass % or less,
(III) metal alkoxide-based compound and/or metal chelate compound: 0.01 mass % or more and 10 mass % or less,
(IV) epoxy resin: 0.5 mass % or more and 20 mass % or less, and
(V) at least one selected from the group consisting of a polyamine resin, a polyamide amine resin, and a polyamide resin: 0.1 mass % or more and 10 mass % or less.

### Claim 13 (depends on 5)

The resin-coated metal sheet for a container according to claim 5, wherein a resin in the resin layer (b2) is a composition derived by mixing a polyester (i) containing polyethylene terephthalate or copolymerized polyethylene terephthalate containing less than 6 mol % of copolymerization components and a polyester (ii) containing polybutylene terephthalate or copolymerized polybutylene terephthalate containing less than 5 mol % of copolymerization components, and
a content of the polyester (i) is 60 mass % or less and a content of the polyester (ii) is 40 mass % or more.

### Claim 14 (depends on 4)

The resin-coated metal sheet for a container according to claim 4, wherein the resin layer (B) contains wax compounds in an amount of 5.0 mass % or less with respect to the resin layer (B).

### Claim 15 (depends on 5)

The resin-coated metal sheet for a container according to claim 5, wherein the resin layer (B) contains wax compounds in an amount of 5.0 mass % or less with respect to the resin layer (B).

### Claim 16 (depends on 6)

The resin-coated metal sheet for a container according to claim 6, wherein the resin layer (B) contains wax compounds in an amount of 5.0 mass % or less with respect to the resin layer (B).

### Claim 17 (depends on 8)

The resin-coated metal sheet for a container according to claim 8, wherein the wax compounds contain a carnauba wax.

### Claim 18 (depends on 2)

A method for manufacturing the resin-coated metal sheet for a container according to claim 2, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 19 (depends on 3)

A method for manufacturing the resin-coated metal sheet for a container according to claim 3, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 20 (depends on 4)

A method for manufacturing the resin-coated metal sheet for a container according to claim 4, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 21 (depends on 5)

A method for manufacturing the resin-coated metal sheet for a container according to claim 5, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 22 (depends on 6)

A method for manufacturing the resin-coated metal sheet for a container according to claim 6, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 23 (depends on 7)

A method for manufacturing the resin-coated metal sheet for a container according to claim 7, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 24 (depends on 8)

A method for manufacturing the resin-coated metal sheet for a container according to claim 8, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.

### Claim 25 (depends on 9)

A method for manufacturing the resin-coated metal sheet for a container according to claim 9, the method comprising determining resin layer forming conditions such that, with respect to a Raman band of 1615 cm−1 determined by performing Raman spectroscopy on the uppermost resin layer (a1), a maximum value of a ratio (IMD/IND) of peak intensity (IMD) in a longitudinal direction to peak intensity (IND) in a thickness direction is 1.0 or more and 4.0 or less.