Organosiloxane–Polyol Ester Coatings for Wear-Resistant Lipophilicity
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Solution Overview
Problem
Conventional coating agents form cured films that are excellent in lipophilicity but lack abrasion resistance, leading to reduced performance over time, and those with abrasion resistance do not provide sufficient lipophilicity, making fingerprints conspicuous on touch panels.
Innovation Solution
A coating agent composition comprising a lipophilic group-containing (hydrolyzable) organosiloxane compound and a polyol ester in a specific weight ratio, forming a cured film that is both lipophilic and abrasion-resistant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fluoropolyether group-containing polymer with hydrolyzable silyl group is used to form a coating, then water/oil-repellent property and ease of wiping off stains are improved, but fingerprints become conspicuous due to light scattering from fine oil droplets
Solution Approach 1:
The invention changes the chemical composition parameters by introducing a lipophilic compound with specific molecular structure (containing ester group and long alkyl chain) to modify the coating's interaction with sebum. This parameter change allows the coating to maintain lipophilicity while preventing the formation of light-scattering oil droplets, thus making fingerprints inconspicuous.
Solution Approach 2:
The invention creates a composite coating system by combining fluoropolyether group-containing polymer with hydrolyzable silyl group and lipophilic compound. This composite material integrates the water/oil-repellent property of fluoropolymer with the lipophilicity of the lipophilic compound, achieving both ease of stain removal and fingerprint inconspicuity simultaneously.
2Object-affected harmful factors
If a silane compound with hydrolyzable silyl group is introduced into a lipophilic compound to form a cured film, then lipophilicity is improved, but abrasion resistance is reduced leading to wear out over time
Solution Approach 1:
The invention optimizes the molecular structure parameters of the lipophilic compound by introducing specific functional groups (ester group) and controlling alkyl chain length (1-10 carbon atoms). This parameter optimization enhances both lipophilicity and abrasion resistance, allowing the coating to maintain its properties over time without significant wear.
Solution Approach 2:
The invention uses the silane compound as an intermediary that bridges the substrate and the lipophilic compound. The hydrolyzable silyl group forms strong chemical bonds with the substrate, while the lipophilic compound provides the desired surface properties. This intermediary approach ensures durable adhesion while maintaining lipophilicity and abrasion resistance.
3Reliability
If a coating is made tough and durable through chemical and physical bonds with substrate, then durability is improved, but the coating surface repels sebum to form fine oil droplets that scatter light
Solution Approach 1:
The invention applies different properties to different aspects of the coating: the fluoropolyether group-containing polymer provides durability and adhesion through strong bonds with the substrate, while the lipophilic compound provides the specific surface quality that makes fingerprints inconspicuous by preventing sebum scattering. This local differentiation of functional properties resolves the contradiction between durability and fingerprint visibility.
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 composition effectively spreads sebum on the surface, reducing friction and providing a durable, lipophilic coating that maintains appearance and visibility by minimizing fingerprint visibility.
Implementation Method 1
the hydrolyzable silyl group undergoes self-condensation reaction due to moisture in the air or the like to form a coating
Implementation Method 2
the hydrolyzable silyl group forms chemical and physical bonds with the surface of glass, metal, or the like, the coating becomes a tough coating having durability
Implementation Method 3
the hydrolyzable silyl group forms chemical and physical bonds with the surface of glass, metal, or the like
Implementation Method 4
The composition effectively spreads sebum on the surface, reducing friction and providing a durable, lipophilic coating
Data Source
AI summary
A coating agent composition containing as essential components (A) a lipophilic group-containing (hydrolyzable) organosiloxane compound, containing a lipophilic group selected from groups represented by the formulas (-C(=O)OR1), (-O-C(=O)R1), (-C(=O)NR12), (-C(=O)SR1), and (-P(=O)(OR1)2) (R1: H, C1-30 alkyl group, C6-30 aryl group, or C7-30 aralkyl group) and a silanol group or a hydrolyzable silyl group, and/or a partial (hydrolyzed) condensation product thereof and (B) a polyol ester comprising a condensation product of a dihydric to hexahydric alcohol and a C3-22 fatty acid, the mass ratio of components (A) and (B) being 0.1 < (A)/(B) < 10, can form a cured film having excellent lipophilicity and wear resistance.