Copolymer polyester sealant film

JP7622526B2Active Publication Date: 2025-01-28MITSUBISHI CHEM CORP
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Patent Information

Application Number
JP2021067059
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-11-16
Filing Date
2021-04-12
Publication Date
2025-01-28
Estimated Expiration
2041-04-12

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Abstract

To provide a copolymerization polyester-based sealant film which has extremely excellent heat seal strength, and is excellent in recyclability.SOLUTION: A copolymerization polyester-based sealant film is a laminate film composed of at least two layers having a seal layer and an outermost layer, in which each of the layers contains copolymerization polyester composed of a copolymer of a terephthalic acid other dicarboxylic acid component, and a diol component, the outermost layer contains polyethylene terephthalate as a main component, the laminate film has such a laminate layer constitution that a content ratio (mol%) of the other dicarboxylic acid component in each of the layers from the seal layer toward the outermost layer decreases, and a heat seal strength at the time when the laminate film is sealed at 140-220°C and 0.2 MPa for 1 second is equal to or more than 25 N / 15 mm.SELECTED DRAWING: None
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Citation Information

Patent Citations

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