Thermoplastic resin-coated metal sheet, can body and can lid made from the same metal sheet

Patent metadata

Field	Value
Publication number	US-2016115346-A1
Application number	US-201414895152-A
Country	US
Kind code	A1
Filing date	Jun 16, 2014
Priority date	Jun 21, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

A thermoplastic resin-coated metal sheet obtained by coating at least one surface of a metal sheet with a thermoplastic resin via a polyester type primer, wherein the polyester type primer, if it is in the form of a 10 μm-thick dry primer sheet, has a breaking elongation in a range of 9 to 200% at a tension speed of 1000 mm/min. and an MEK extractability in a range of 3 to 40%. Without using a special thermoplastic resin-coated film or surface-treated metal sheet, therefore, the cans and can lids can be formed using the thermoplastic resin-coated metal sheet of the invention maintaining excellent and close adhesion during the working, preventing the can body from breaking and the thermoplastic resin coating from peeling at the flange-forming portion during the working, the cans and can lids excelling in dent resistance and economy.

First claim

1 . A thermoplastic resin-coated metal sheet obtained by coating at least one surface of a metal sheet with a thermoplastic resin via a polyester type primer, wherein said polyester type primer, if it is in the form of a 10 μm-thick dry primer sheet, has a breaking elongation in a range of 9 to 200% at a tension speed of 1000 mm/min. and an MEK extractability in a range of 3 to 40%.

2 . The thermoplastic resin-coated metal sheet according to claim 1 , wherein said polyester type primer comprises a polyester resin that contains an aromatic dicarboxylic acid and an aliphatic dicarboxylic acid having 6 to 14 carbon atoms, and a curing agent.

3 . The thermoplastic resin-coated metal sheet according to claim 2 , wherein said polyester resin contains sebacic acid, and at least one of isophthalic acid or terephthalic acid as a dicarboxylic acid component, said sebacic acid being contained in an amount of 8 to 25 mol % relative to the whole polyester resin.

4 . The thermoplastic resin-coated metal sheet according to claim 2 , wherein said polyester resin contains cyclohexanediethanol, and at least one of ethylene glycol or propylene glycol as a diol component, said cyclohexanediethanol being contained in an amount of 15 to 40 mol % relative to the whole polyester resin.

5 . The thermoplastic resin-coated metal sheet according to claim 2 , wherein said curing agent is contained in an amount of 5 to 43 parts by mass per 100 parts by mass of said polyester resin.

6 . The thermoplastic resin-coated metal sheet according to claim 2 , wherein said curing agent is a phenolic curing agent.

7 . The thermoplastic resin-coated metal sheet according to claim 2 , wherein said curing agent is a resol type phenolic resin derived from an m-cresol.

8 . The thermoplastic resin-coated metal sheet according to claim 1 , wherein the primer layer comprising said polyester type primer has a thickness in a range of 0.1 to 4.5 μm.

9 . A can body comprising the thermoplastic resin-coated metal sheet of claim 1 .

10 . A can lid comprising the thermoplastic resin-coated metal sheet of claim 1 .

Assignees

• Toyo Seikan Group Holdings Ltd

Inventors

• Nagai Nobuhiko
• Hiromori Shuhei

Classifications

• B32B15/09

  comprising polyesters · CPC title

• C09D167/02 Primary

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence) · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• B32B2307/732

  Dimensional properties · CPC title

• B32B1/00

  Layered products having a non-planar shape · CPC title