Transparent Laminate Structure Layer Anti-Fogging
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Solution Overview
Problem
Existing transparent laminates fail to provide excellent visibility with low reflection, anti-fogging, and balanced adhesion and releasability, as they often have low water contact angles and include secondary materials that compromise adhesion when trying to achieve polarization-free 3D display compatibility.
Innovation Solution
A transparent laminate with a structure layer containing a polymerized product of an active energy ray curable resin composition, featuring a specific ratio of monofunctional and trifunctional (meth)acrylate compounds, and a nitrogen-containing monofunctional (meth)acryloyl group-containing polymerizable compound, which ensures high water contact angles and effective wiping capabilities while maintaining adhesion and releasability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield has a surface having excellent hydrophobicity to obtain anti-fogging, then anti-fogging performance is improved, but wiping capability is impaired because the surface has excellent compatibility to aqueous pollutants
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water contact angle within 20-90 degrees through specific resin composition ratios (monofunctional, difunctional, and trifunctional (meth)acrylates) and UV irradiation conditions. This optimized parameter range creates a surface that is hydrophobic enough to prevent fogging but not so hydrophobic that it prevents wiping, thus resolving the contradiction between anti-fogging performance and wiping capability
Solution Approach 2:
The patent uses composite materials by combining multiple types of (meth)acrylate resins with different functional groups in specific proportions. The combination of monofunctional, difunctional, and trifunctional (meth)acrylates creates a composite resin system that achieves balanced surface properties, providing both anti-fogging and wipeability through the synergistic effect of different molecular structures
2Object-generated harmful factors
If the transmittance is reduced due to surface reflection of the shield, then reflection protection is improved, but visibility is impaired
Solution Approach 1:
The patent applies parameter changes by optimizing the fine protrusion and depression structure dimensions (with pitch of 0.1-10 μm and depth of 0.1-5 μm) to control light reflection characteristics. This specific structural parameter range reduces surface reflection to improve visibility while maintaining anti-fogging properties through the controlled water contact angle
3Strength
If a shield has excellent adhesion between substrate and cured product layer, then adhesion is improved, but releasability from master is impaired
Solution Approach 1:
The patent applies local quality by differentiating the properties of different regions: the cured product layer has strong adhesion to the substrate through UV curing, while the uncured resin layer maintains releasability from the master. This spatial differentiation of material states (cured vs. uncured) allows simultaneous achievement of strong adhesion and easy releasability in different locations
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 laminate achieves excellent transparency, low reflection, anti-fogging, and balanced adhesion and releasability, ensuring visibility without impairing 3D display polarization properties.
Implementation Method 1
a cured product layer formed of a cured product of an active energy ray curable resin composition
Implementation Method 2
a fine protrusion and depression structure... excellent visibility with low reflection
Implementation Method 3
nitrogen-containing monofunctional (meth)acryloyl group-containing polymerizable compound... ensures high water contact angles and effective wiping capabilities while maintaining adhesion and releasability
Data Source
Figure 1A~2
Figure 3A~3B
Figure 4~5B
AI summary
A transparent laminate including a transparent substrate and structure layer, wherein the structure layer contains protrusion portions, depression portions, or both on a surface thereof, and an average distance between the adjacent protrusion portions or between the adjacent depression portions is equal to or less than a visible light wavelength, the structure layer includes a polymerized product of an active energy ray curable resin composition, the resin composition includes a composition of a (meth)acryloyl group-containing polymerizable compound, the compound composition includes one or more from each of (A), (B), and (C): (A) a monofunctional (meth)acryloyl group-containing polymerizable compound; (B) alkylene glycol di(meth)acrylate; and (C) trifunctional or higher (meth)acrylate, the (A) satisfies certain conditions specifying a type and amount of a compound, and a ratio (E'150/E'50) of storage elastic modulus E'150 of the structure layer at 150°C to storage elastic modulus E'50 thereof at 50°C is 0.5 or less.