Biaxially oriented polypropylene film, and mold release film, process film and protective film using same

A biaxially oriented polypropylene film with a silylated polyolefin surface layer addresses mold release agent requirements and wrinkle issues, enhancing release properties and film strength, suitable for process and protective films.

WO2026063060A1PCT designated stage Publication Date: 2026-03-26TOYOBO CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-07-29
Publication Date
2026-03-26

AI Technical Summary

Technical Problem

Existing biaxially oriented polypropylene films face issues such as the need for a mold release agent layer application and wrinkles or lifting during thermosetting resin film molding, while also lacking optimal release properties.

Method used

A biaxially oriented polypropylene film with a base layer made of a polypropylene resin composition and a surface layer containing silylated polyolefin, with specific peel strength, stress, thermal shrinkage, and haze values, eliminating the need for a mold release agent and enhancing release properties.

Benefits of technology

The film achieves excellent release properties without a mold release agent, reducing wrinkles and improving film strength, rigidity, and heat resistance, making it suitable for process, release, and protective films.

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  • Figure JP2025026852_26032026_PF_FP_ABST
    Figure JP2025026852_26032026_PF_FP_ABST
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Abstract

This biaxially oriented polypropylene film comprises a base material layer A composed of a polypropylene resin composition and a surface layer B composed of a polypropylene resin composition, wherein the polypropylene resin composition constituting the surface layer B contains a silylated polyolefin, the peel strength of the surface layer B is 0.1-3.0 N / 25 mm, the sum of the stress at 5% elongation in the longitudinal direction and the stress at 5% elongation in the width direction of the biaxially oriented polypropylene film is 118-200 MPa, the stress at 5% elongation in the longitudinal direction of the biaxially oriented polypropylene film is 35-70 MPa, and the stress at 5% elongation in the width direction of the biaxially oriented polypropylene film is 76-150 MPa.
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Citation Information

Patent Citations

  • Method for producing stretched film

    JP2017030218A

  • Multilayer film

    JP2022149440A

  • Release biaxially oriented polypropylene film and release film

    JP2023095425A

  • Laminate film, release laminate film and release film

    JP2023095728A

  • Biaxially oriented polypropylene film and method for producing same

    WO2015072291A1