Laminated film

Patent metadata

Field	Value
Publication number	US-12590196-B2
Application number	US-202318297157-A
Country	US
Kind code	B2
Filing date	Apr 7, 2023
Priority date	Oct 8, 2020
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

A laminated film in which curl is suppressed when the film is heat-sealed with a material different from that of a substrate, the substrate is made of polyethylene terephthalate; and a sealant laminated on one side of the substrate and being to be sealed with a dissimilar material that is a material different from that of the substrate, wherein, when a laminate including a 100 mm×100 mm square of a portion of the laminated film and an 80 mm×80 mm square of the dissimilar material is placed on a flat surface so that the dissimilar material faces down, the portion of the laminated film including a portion of the substrate and a portion of the sealant, the dissimilar material being heat-sealed on a central portion of the portion of the sealant, each corner of the dissimilar material has a rise height of 20 mm or less.

First claim

What is claimed is:

1 . A laminated film, comprising:
a substrate consisting of polyethylene terephthalate; an anchor coat layer on a first surface of the substrate, the anchor coat layer formed by drying a coating liquid comprising aliphatic ester and ethyl ester at a temperature from 50° C. to 80° C., and a sealant consisting of an ethylene-methacrylic acid copolymer or an ethylene-acrylic acid copolymer on the anchor coat layer, the sealant layer is configured to be sealed with a dissimilar material that is a material different from the polyethylene terephthalate of the substrate, wherein, for a laminate comprising a 100 mm×100 mm square of a portion of the laminated film and an 80 mm×80 mm square of the dissimilar material being placed on a flat surface so that the dissimilar material faces down, the portion of the laminated film including a portion of the substrate and a portion of the sealant, the dissimilar material being heat-sealed on a central portion of the portion of the sealant, each corner of the dissimilar material has a rise height of 20 mm or less, the rise height being a height from the flat surface.

2 . The laminated film of claim 1 , wherein:
the laminated film has a thermal shrinkage ratio of 0 to 0.4% in a flow direction of the substrate, and 0 to 0.3% in a direction perpendicular to the flow direction of the substrate.

3 . The laminated film of claim 1 , wherein:
the sealant consists of, an ethylene-methacrylic acid copolymer.

4 . The laminated film of claim 1 , wherein the dissimilar material is a metal foil.

5 . The laminated film of claim 4 , wherein the metal foil is a copper foil or an aluminum foil.

6 . The laminated film of claim 4 , wherein the metal foil is a copper foil.

7 . The laminated film of claim 4 , wherein the substrate is cut in a center of substrate.

8 . The laminated film of claim 5 , wherein the substrate is cut in a center of substrate.

9 . The laminated film of claim 6 , wherein the substrate is cut in a center of substrate.

10 . The laminated film of claim 1 , wherein the substrate is cut in a center of substrate.

Assignees

• Toppan Inc

Inventors

• Nakata Hiroki

Classifications

• B32B2250/24

  All layers being polymeric · CPC title

• B32B27/308

  comprising acrylic (co)polymers · CPC title

• C08J7/052

  Forming heat-sealable coatings · CPC title

• B32B2255/26

  Polymeric coating · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title