Title:
POLYESTER-BASED FILM FOR LAMINATING METAL PLATE
Document Type and Number:
Japanese Patent JP2021171987
Kind Code:
A
Abstract:
To provide a polyester-based film for laminating a metal plate, which is suitable for a food can and a beverage can in which adhesive strength to a metal plate does not decrease even when stored in a warehouse where the temperature is insufficiently controlled when the temperature is high in summer.SOLUTION: There is provided a biaxially-stretched polyester film for laminating a metal plate, having at least an adhesive layer (A layer) made of a polyester resin and a surface layer (B layer) made of a polyester resin, in which the adhesive layer satisfies the following (1) to (5): (1) the polyester resin for the adhesive layer contains 82 to 90 mol% of a repeating unit of ethylene terephthalate and 10 to 18 mol% of a repeating unit of a copolymerization component; (2) a sealing strength in which the adhesive layers are heat sealed is 1 N/15 mm or more and 2.5 N/15 mm or less; (3) a trans-conformation ratio of the adhesive layer obtained by a polarized ATR method is 1 or more and 1.5 or less; (4) a difference in sealing strength between the adhesive layers after aging at 50°C for 336 hours and before aging is 1.5 N/15 mm or less; and (5) a difference in the trans-conformation ratio of the adhesive layer obtained by a polarized ATR method after aging at 50°C for 336 hours and before aging is 0.7 or less.SELECTED DRAWING: None
Inventors:
TSUCHIYA KEIJI
HARUTA MASAYUKI
HARUTA MASAYUKI
Application Number:
JP2020076748A
Publication Date:
November 01, 2021
Filing Date:
April 23, 2020
Export Citation:
Assignee:
TOYO BOSEKI
International Classes:
B32B27/36; B32B7/022; B65D25/14; C08G63/127
Domestic Patent References:
| JP2014196406A | 2014-10-16 | |||
| JP2000071406A | 2000-03-07 | |||
| JP2006062367A | 2006-03-09 |