Toyo Seikan Group Holdings, Ltd.

Takuya Kashiwakura

Yuji Funagi

Tomohiro Miyai

Arata Sakuragi

Hiromi Yamamoto

Nan Zhang

The disclosure relates to a drawn/ironed can having at least an inner surface coating film on a can inner surface side, the inner surface coating film containing a polyester resin and a curing agent, and a stress relaxation ratio of the inner surface coating film after 10 minutes at 1% elongation in a can bottom portion is 50% or higher under a test condition of 100° C., whereby metal exposure due to severe processing such as drawing or ironing and coating film peeling due to heat treatment after molding are effectively prevented.

Drawn/ironed can and coated metal sheet for drawn/ironed cans

An organic resin-covered surface-treated metal sheet having formed on at least one surface of a metal sheet a surface-treatment coating and an organic resin film on the coating. The surface-treatment coating contains a polyvalent metal compound and a poly-carboxylic acid type polymer containing not less than 60 mol % constituent units derived from at least one polymerizable monomer selected from acrylic acid, maleic acid, methacrylic acid, and itaconic acid. The surface-treatment coating measured for its infrared-ray absorption spectra has a peak height ratio (&#x3b2;/&#x3b1;) of a maximum absorption peak height (&#x3b1;) in a wave number range of 1660 to 1760 cmand a maximum absorption peak height (&#x3b2;) in a wave number range of 1490 to 1659 cmis from 0.37 to 2.35. Also disclosed is a can body made from the organic resin-covered surface-treated metal sheet and a can lid made from the organic resin-covered surface-treated metal sheet.

Organic resin-covered surface-treated metal sheet

A chromium-free surface-treated metal sheet includes a metal sheet, a surface-treatment coating that contains a polycarboxylic acid type polymer and a zirconium compound and that is formed on at least one surface of the metal sheet, and a coating that contains a polyester resin, a phenol resin and an acid catalyst and that is formed on the surface-treatment coating. The surface-treated metal sheet can be used for producing cans and can lids maintaining excellent dent resistance even for acidic beverages, without permitting the organic resin film formed on the coating to be peeled even under high-temperature and wet environments during a sterilization treatment or the like, and maintaining excellent hot water-resistant adhering property.

Surface-treated metal sheet and organic resin-covered surface-treated metal sheet

An organic resin-covered surface-treated metal sheet having formed on at least one surface of a metal sheet a surface-treatment coating and an organic resin film on the surface-treatment coating. The surface-treatment coating contains a poly-carboxylic acid type polymer and a polyvalent metal compound. The surface-treatment coating measured for its infrared-ray absorption spectra has a peak height ratio (&#x3b2;/&#x3b1;) of a maximum absorption peak height (&#x3b1;) in a wave number range of 1660 to 1760 cmand a maximum absorption peak height (&#x3b2;) in a wave number range of 1490 to 1659 cmof from 0.05 to 2.35.

A surface-treated aluminum plate obtained by forming, on at least one surface of an aluminum plate, a conversion-coated layer that contains a polyester resin and a zirconium compound or a titanium compound. The surface-treated aluminum plate excellently adheres to an organic resin coating and can be used as a material for producing cans featuring excellent corrosion resistance and shock resistance.

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Yokohama, Japan

Takuya Kashiwakura