US 2025/0059335 A1Published application

Biaxially oriented polypropylene-based film

AssigneeToyobo Co., Ltd.

InventorsAtsushi KANAYA, Toru IMAI

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Abstract

Provided is a biaxially oriented polypropylene-based film that is suitable as a raw film for processing and that, without impairing excellent transparency and mechanical properties intrinsically possessed by the biaxially oriented polypropylene-based film, exhibits excellent adhesiveness at the time of vapor deposition, coating, or lamination with another film and also has favorable slipperiness and blocking resistance. The biaxially oriented polypropylene-based film contains at least base material layer (A), surface layer (B), and surface layer (C), each containing a polypropylene-based resin as a main component, wherein each of surface layers (B) and (C) has a wetting tension of 38 mN/m or higher and 50-200 protrusions of 500 nm or larger in a surface area of 2000 μm2, and surface layers (B) and (C) have a Martens hardness of 350 N/mm2 or lower and 270 N/mm2 or lower, respectively, and an arithmetic average roughness (Ra) of 1.5-3.0 nm and 3.5-5.5 nm, respectively.

Claims5

Dependent claims

A biaxially oriented polypropylene-based film comprising

at least three layers which are a base material layer (A), a surface layer (B), and a surface layer (C) each containing a polypropylene-based resin as a main component, wherein
the surface layer (B) and the surface layer (C) satisfy the following conditions (1) and (2), the surface layer (B) satisfies the following conditions (B1) and (B2), and the surface layer (C) satisfies the following conditions (C1) and (C2),
(1) a surface of each of the surface layer (B) and the surface layer (C) has a wetting tension of 38 mN/m or higher,
(2) the number of protrusions of 500 nm or larger in a surface area of 2000 μm2 on each of the surface layer (B) and the surface layer (C) is 50 or larger and 200 or smaller,
(B1) the surface of the surface layer (B) has a Martens hardness of 350 N/mm2 or lower,
(B2) the surface of the surface layer (B) has an arithmetic average roughness of 1.5 nm or larger and 3.0 nm or smaller,
(C1) the surface of the surface layer (C) has a Martens hardness of 270 N/mm2 or lower, and
(C2) the surface of the surface layer (C) has an arithmetic average roughness of 3.5 nm or larger and 5.5 nm or smaller.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/724,475Filed 15 Dec 2022
Priority: JP 2021-21464228 Dec 2021
Published: 20 Feb 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
B32B 3/266
Characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or…
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

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