Polyester resin-coated metal sheet and container using same

Patent metadata

Field	Value
Publication number	US-2018170010-A1
Application number	US-201615737267-A
Country	US
Kind code	A1
Filing date	Feb 19, 2016
Priority date	Jun 16, 2015
Publication date	Jun 21, 2018
Grant date	—

Abstract

[Problem] To provide a polyester resin-coated metal sheet which has excellent coating material adhesion capable of withstanding severe forming processing while retaining high decorative property and photoluminescence property and a container using the same. [Solution] The polyester resin-coated metal sheet of the present invention includes a metal sheet, and a non-oriented polyester resin formed of a plurality of layers provided on at least one surface of the metal sheet. A surface layer and an adjacent layer in contact with the surface layer, of the plurality of layers, have a difference therebetween in melting temperature of not less than 10° C., and a difference in tensile stress at an elongation of 250% under an environmental temperature of 70° C. of less than 3 MPa in tensile tests in a single-layer film state corresponding to each layer, and the surface layer contains fine particles.

First claim

1 . A polyester resin-coated metal sheet comprising:
a metal sheet; and a non-oriented polyester resin including a plurality of layers provided on at least one surface of the metal sheet, wherein, of the plurality of layers, a surface layer and an adjacent layer in contact with the surface layer have a difference therebetween in melting temperature of not less than 10° C., and a difference therebetween in tensile stress at an elongation of 250% under an environmental temperature of 70° C. of less than 3 MPa in tensile tests in a single-layer film state corresponding to each layer, and the surface layer contains fine particles.

2 . The polyester resin-coated metal sheet according to claim 1 , wherein the surface layer and the adjacent layer have a difference therebetween in tensile stress at an elongation of 250% under an environmental temperature of 90° C. of less than 5.5 MPa in tensile tests in a single-layer film state corresponding to each layer.

3 . The polyester resin-coated metal sheet according to claim 1 , wherein the non-oriented polyester resin in the surface layer contains the fine particles having a diameter of 0.1 to 2 μm in an amount of 0.1 to 20 vol %.

4 . The polyester resin-coated metal sheet according to claim 3 , wherein the non-oriented polyester resin in the adjacent layer contains second fine particles having a diameter of 0.1 to 2 μm in an amount of 5 to 20 vol %.

5 . A container formed by use of the polyester resin-coated metal sheet according to claim 1 .

6 . The polyester resin-coated metal sheet according to claim 2 , wherein the non-oriented polyester resin in the surface layer contains the fine particles having a diameter of 0.1 to 2 μm in an amount of 0.1 to 20 vol %.

7 . The polyester resin-coated metal sheet according to claim 6 , wherein the non-oriented polyester resin in the adjacent layer contains second fine particles having a diameter of 0.1 to 2 μm in an amount of 5 to 20 vol %.

8 . A container formed by use of the polyester resin-coated metal sheet according to claim 2 .

8 . A container formed by use of the polyester resin-coated metal sheet according to claim 3 .

9 . A container formed by use of the polyester resin-coated metal sheet according to claim 4 .

10 . A container formed by use of the polyester resin-coated metal sheet according to claim 6 .

11 . A container formed by use of the polyester resin-coated metal sheet according to claim 7 .

Assignees

• Toyo Kohan Co Ltd
• Toyo Seikan Kaisha Ltd

Inventors

• Yoshimura Kunihiro
• Taya Shinichi
• Manita Tomoko

Classifications

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• B32B2264/10

  Inorganic particles · CPC title

• B32B15/18

  comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B27/36

  comprising polyesters · CPC title