Optical Laminate Antifouling Layer Adhesion via Surface Roughness

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Solution Overview

Problem

Existing optical laminates with antifouling layers struggle to maintain high abrasion resistance against repeated friction, as unreacted materials contributing to abrasion resistance are easily rubbed off.

Innovation Solution

A method of manufacturing an optical laminate comprising a transparent substrate, an adhesion layer, an optical functional layer, and an antifouling layer, where the surface of the optical functional layer is treated to modify its surface roughness and then coated with an antifouling layer formed by vapor deposition of a fluorine-based organic compound.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an antifouling layer is formed on the outermost surface of the anti-reflective film for surface protection, then surface protection and antifouling properties are improved, but abrasion resistance deteriorates when friction is repeated because unreacted materials are rubbed off

Engineering Contradiction:

Improvesurface protection and antifouling propertiesVSAvoidabrasion resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies surface treatment (plasma treatment, corona treatment, or UV irradiation) to change the surface parameters of the optical functional layer, increasing surface roughness by 10-200% to enhance mechanical interlocking with the antifouling layer. This parameter change in surface topology allows the antifouling layer to maintain high abrasion resistance even after repeated friction by preventing unreacted materials from being easily rubbed off.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite structure by forming an antifouling layer on top of an optical functional layer with modified surface properties. The combination of the treated optical functional layer surface and the antifouling layer forms a composite system where the roughened surface acts as an anchoring structure, providing both surface protection and sustained abrasion resistance through mechanical interlocking.

Inventive Principle:

Principle #40Composite materials

2Strength

If the surface roughness of the optical functional layer is increased to improve adhesion, then adhesion between layers is improved, but surface smoothness deteriorates which may affect optical performance

Engineering Contradiction:

Improveadhesion between optical functional layer and antifouling layerVSAvoidsurface smoothness

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

The patent applies surface treatment only to the outermost surface of the optical functional layer, creating a localized roughened zone at the interface with the antifouling layer while keeping the bulk and inner surfaces smooth. This local quality change ensures enhanced adhesion at the critical interface without compromising the overall optical performance of the laminate.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces a new dimension of surface topology by creating nanoscale or microscale roughness features on the optical functional layer surface. This dimensional change in surface architecture provides mechanical interlocking sites for the antifouling layer while maintaining the optical functionality through controlled roughness that does not significantly scatter light.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The proposed solution enables the optical laminate to maintain high abrasion resistance and alkali resistance even after repeated friction, while also ensuring excellent visible light transmittance and adhesion between the optical functional layer and the antifouling layer.

Implementation Method 1

a surface treatment step of treating the surface of the optical functional layer so that the rate of change in surface roughness represented by formula (1) is 1 to 25%

Methodology Applied

Scientific EffectSurface roughness modification:

Implementation Method 2

an antifouling layer forming step of forming the antifouling layer on the surface-treated optical functional layer

Methodology Applied

Scientific EffectVapor deposition: Physical Vapour Deposition

Data Source

PatentUS12275226B2Method of manufacturing optical laminate

Publication Date: 2025.04.15 DEXERIALS CORP

AI summary

This method of manufacturing an optical laminate comprising a transparent substrate, an adhesion layer, an optical functional layer, and an antifouling layer laminated in this order, includes an adhesion layer forming step of forming the adhesion layer, an optical functional layer forming step of forming the optical functional layer, a surface treatment step of treating the surface of the optical functional layer so that the rate of change in surface roughness represented by formula (1) is 1˜25%, and an antifouling layer forming step of forming the antifouling layer on the surface-treated optical functional layer; Rate of change of surface roughness (%)=((Ra2/Ra1)−1)×100(%) Formula (1) (Formula (1), where Ra1 represents the surface roughness (Ra) of the optical functional layer before the surface thereof is treated, and Ra2 represents the surface roughness (Ra) of the optical functional layer after the surface thereof is treated.).