Laminated film, method for producing laminated film, and article

The laminated film structure with controlled surface free energy and chlorinated polyolefin distribution in the primer layer addresses adhesion limitations, providing high adhesion and peelability while maintaining coating properties.

WO2026141653A1PCT designated stage Publication Date: 2026-07-02NIPPON PAINT AUTOMOTIVE COATINGS
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NIPPON PAINT AUTOMOTIVE COATINGS
Filing Date
2025-12-26
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing methods for enhancing adhesion of laminated films on plastic materials face limitations due to the deterioration of paint properties and coating film properties when excessive chlorinated polyolefin is used, and controlling surface free energy alone is insufficient.

Method used

A laminated film structure comprising a protective film layer, a primer layer containing a modified resin with chlorinated polyolefin, and a resin substrate layer, where the surface free energy of the peeled protective film layer is maintained within a specific range (10 to 40 mN/m) and the primer layer's surface free energy is 0.1 to 4.0 mN/m, ensuring even distribution of chlorinated polyolefin at the interface.

Benefits of technology

The laminated film achieves high adhesion and peelability without compromising coating properties, allowing for various coating options and improved adhesion to plastic materials.

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Abstract

Provided is a laminated film capable of imparting high adhesiveness, without limitations in terms of composition, particularly to a plastic material and a design layer or a substrate layer of a laminated film body, which are adherends. The laminated film includes a protective film layer (A), a primer layer (B), and a resin substrate layer (C), the laminated film being characterized in that: the primer layer (B) contains a modified resin containing chlorine; and when the protective film layer (A) is peeled off from the laminated film at a rate of 5.0 mm / sec, the surface free energy γ of the protective film (A) on a peel-off side is 10-40 mN / m.
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