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US 12,157,160 B2Granted
Can lid
AssigneeDaiwa Can Company
InventorsToshiyuki Ohkoshi, Hirokazu Konagaya, Tadayosi Iwamaru, Akira Yamamoto, Katsumi Ohshima, Junji Matsumura
Life of this patent
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Abstract
A can lid comprising: a main body comprising a laminate metal sheet, the laminate metal sheet comprising a metal sheet and a first resin film on a major surface of the metal sheet, the major surface having a score line delimiting an opening piece, the first resin film comprising a first resin layer comprising a dimer acid-copolymerized polyester resin and being amorphous; and a tab attached to the main body and adapted to cause a cleavage along the score line.
Claims10
A can lid comprising:
- a main body comprising a laminate metal sheet, the laminate metal sheet comprising a metal sheet and a first resin film on a major surface of the metal sheet, the major surface having a score line delimiting an opening piece, the first resin film comprising
- a first resin layer,
- a second resin layer comprising an isophthalic acid-copolymerized polyester resin as an outermost layer of the main body, and
- a third resin layer comprising an isophthalic acid-copolymerized polyester resin as a layer interposed between the metal sheet and the first resin layer and in contact with the metal sheet,
- the first resin film being amorphous, and
- among the first, second and third resin layers constituting the first resin film, only the first resin layer comprising a dimer acid, the first resin layer comprising the dimer acid in a form of a dimer acid-copolymerized polyester resin;
- and
- a tab attached to the main body and adapted to cause a cleavage along the score line.
5 more elements
Dependencies are inferred from the claim text.