US 12,447,726 B2Granted

Cavity-containing polyester film

AssigneeToyobo Co., Ltd.

InventorsMei Matsumura, Shotaro Nishio, Akira Shimizu

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Abstract

[Problem] To provide a cavity-containing polyester film which exhibits excellent concealability, degree of whiteness and printability, and which is still free from the occurrence of a wrinkle, distortion and the like in cases where, for example, the cavity-containing polyester film is used for a roll label, and a label is delivered therefrom or wound around a product. [Solution] A cavity-containing polyester film which comprises a layer A that internally contains a cavity, and layers B that are arranged on both surfaces of the layer A, wherein: the layer A is formed of a composition A that contains a polyester resin A and a polypropylene resin; the layers B are formed of a composition B that contains inorganic particles and a polyester resin B; and the amount of self-weight deflection of the film is from 60 mm to 100 mm at least in one direction.

Claims9

Dependent claims

A cavity-containing polyester film comprising a layer A containing cavities inside and a layer B disposed on both surfaces of the layer A, wherein

the layer A is formed of a composition A containing a polyester-based resin A and a polypropylene-based resin,
the layer B is formed of a composition B containing inorganic particles and a polyester-based resin B,
both of the polyester-based resin A and the polyester-based resin B contain a recycled bottle raw material, an amount of the recycled bottle raw material contained in the composition B is larger than an amount of the recycled bottle raw material contained in the composition A,
a thickness of the cavity-containing polyester film is 75 μm or more and 300 μm or less,
an amount of self-weight deflection of the film in at least one direction is 60 mm or more and 97 mm or less, and
wherein an elastic modulus of the film in the deflection direction is 2500 MPa or more and 7500 MPa or less.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/020,533Filed 8 Sep 2021
Priority: JP 2020-15452015 Sep 2020
Published: US 2023/0295421 A121 Sep 2023
Granted: 21 Oct 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification53 codes

B32B 27/36
Layered products comprising a layer of synthetic resin: comprising polyesters
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/18
Layered products comprising a layer of synthetic resin: characterised by the use of special additives
B32B 27/205
Using fillers, pigments, thixotroping agents: the fillers creating voids or cavities, e.g. by stretching