Transparent Substrate Antifouling Layer for Creamy Product Removal
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Solution Overview
Problem
Instrument panel cover glass with a fine concavo-convex structure for antiglare properties lacks sufficient antifouling properties, particularly in removing creamy products like hand cream from the water-repellent film described in prior art.
Innovation Solution
An antifouling layer-provided transparent substrate with a divalent group represented by -(OCF2)v(OCF2CF2)w-, where v and w are integers of at least 1, and a specific surface roughness and fluorine content, combined with a reactive silyl group, to enhance antiglare and antifouling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-repellent film is formed using a hydrolyzable silane compound having a perfluoroalkylene group or a fluorinated polyether group, then water repellency and abrasion resistance are improved, but the removability of creamy products such as hand cream is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the antifouling layer by introducing a specific divalent group -(OCF2)v(OCF2CF2)w- with controlled v and w values (v+w≥2), and adjusts the surface roughness parameters (Ra and RSm) to achieve optimal balance between water repellency and creamy product removability
Solution Approach 2:
The patent creates a composite antifouling layer combining multiple functional groups: the divalent group -(OCF2)v(OCF2CF2)w- for water/oil repellency, the reactive silyl group for adhesion to the transparent substrate, and controls surface morphology through the antiglare layer, achieving multifunctional performance
2Illumination intensity
If a fine concavo-convex structure is provided on the surface to obtain antiglare properties, then visibility is improved, but the antifouling properties especially removability of creamy products is insufficient
Solution Approach 1:
The patent segments the surface structure into two distinct functional layers: the transparent substrate with fine concavo-convex structure for antiglare properties, and the separate antifouling layer with specific surface roughness (Ra: 0.01-0.15 μm, RSm: 0.5-5.0 μm) for antifouling performance, allowing each layer to optimize its specific function
Solution Approach 2:
The patent applies different surface quality characteristics to different layers: the transparent substrate maintains the fine concavo-convex structure for light scattering (antiglare), while the antifouling layer has a specific combination of roughness parameters (low Ra, moderate RSm) optimized for creamy product removability
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 substrate achieves excellent antiglare and antifouling properties, particularly in the removability of creamy products, by optimizing the surface roughness and fluorine content of the antifouling layer.
Implementation Method 1
a water-repellent film formed by using a hydrolyzable silane compound having a perfluoroalkylene group or a fluorinated polyether group
Implementation Method 2
a compound having a divalent group represented by -(OCF2)v(OCF2CF2)w- (where v and w are each independently an integer of at least 1) and a reactive silyl group
Data Source
Figure 1~3
AI summary
To provide an antifouling layer-provided transparent substrate, which is excellent in antiglare and antifouling properties, especially in removability of a creamy product such as hand cream. An antifouling layer-provided transparent substrate, containing a transparent substrate and an antifouling layer provided as the top surface layer on one main surface of the transparent substrate, where the antifouling layer has a divalent group represented by -(OCF2)v(OCF2CF2)w- (where v and w are each independently an integer of at least 1), and the surface of the antifouling layer is such that the mean width RSm of the elements and the arithmetical mean roughness Ra satisfy RSm≧Ra×100+5.