Surface-treated metal sheet and organic resin-covered surface-treated metal sheet
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United States of America Patent
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Oct 29, 2019
Grant Date -
Oct 11, 2018
app pub date -
May 18, 2016
filing date -
May 21, 2015
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Abstract
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.
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