Resin coated metal sheet

Patent metadata

Field	Value
Publication number	US-9506152-B2
Application number	US-201114236221-A
Country	US
Kind code	B2
Filing date	Aug 31, 2011
Priority date	Aug 31, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A resin coated metal sheet includes a metal sheet, a first resin coating layer formed on one main surface of the metal sheet and formed of a resin material whose difference between a heat quantity of crystallization and a heat quantity of fusion after being laminated to the metal sheet is 6 J/g to 20 J/g on a unit weight basis, and a second resin coating layer formed on another main surface of the metal sheet.

First claim

The invention claimed is:

1. A resin coated metal sheet comprising:
a metal sheet;
a first resin coating layer formed on one main surface of the metal sheet and formed of a resin material whose difference between a heat quantity of crystallization and a heat quantity of fusion after being laminated to the metal sheet is 6 J/g to 20 J/g on a unit weight basis; and
a second resin coating layer formed on another main surface of the metal sheet, wherein
the first and the second resin coating layers are formed of a resin material containing 90 mol % or more ethylene terephthalate unit, and
a melting point of the first resin coating layer is 240° C. to 254° C.

2. The resin coated metal sheet according to claim 1 , wherein intrinsic viscosity of the first and the second resin coating layers is 0.55 dl/g to 0.90 dl/g.

3. The resin coated metal sheet according to claim 1 , wherein the first resin coating layer comprises titanium oxide in an amount 8 wt % to 30 wt %.

4. The resin coated metal sheet according to claim 3 , wherein
the first resin coating layer comprises a three-layer structure of an outermost layer, an intermediate layer, and a lowermost layer,
film thickness of the outermost layer and the lowermost layer is 1 μm to 5 μm, and film thickness of the intermediate layer is 6 μm to 30 μm, and
the outermost layer and the lowermost layer comprise titanium oxide in an amount of 0 wt % to 2 wt %, and the intermediate layer comprises titanium oxide in an amount of 10 wt % to 30 wt %.

5. The resin coated metal sheet according to claim 4 , wherein a difference in melting points among the outermost layer, the intermediate layer, and the lowermost layer is 10° C. or less.

6. The resin coated metal sheet according to claim 1 , wherein a melting point of the second resin coating layer is lower than the melting point of the first resin coating layer by 4° C. to 20° C.

7. The resin coated metal sheet according to claim 1 , wherein the second resin coating layer is formed of a resin material whose difference between a heat quantity of crystallization and a heat quantity of fusion after being laminated to the metal sheet is 0 J/g to 10 J/g on a unit weight basis.

8. The resin coated metal sheet according to claim 1 , wherein a wax component is applied to a surface of the first resin coating layer in an adhesion amount of 20 mg/m 2 to 80 mg/m 2 .

9. The resin coated metal sheet according to claim 1 , wherein the first resin coating layer comprises a wax component in an amount of 0.05 wt % to 5 wt %.

Assignees

• Kitagawa Junichi
• Yamanaka Yoichiro
• Nakagawa Yusuke
• Kojima Katsumi
• Suto Mikito
• Tobiyama Yoichi
• Jfe Steel Corp

Inventors

• Kitagawa Junichi
• Yamanaka Yoichiro
• Nakagawa Yusuke
• Kojima Katsumi
• Suto Mikito
• Tobiyama Yoichi

Classifications

• B32B27/18

  characterised by the use of special additives · CPC title

• B32B15/00

  Layered products comprising {a layer of} metal · CPC title

• B32B2391/00

  Waxes · CPC title

• B32B2311/00

  Metals, their alloys or their compounds · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title