Resin Particles for Scratch-Resistant Coatings
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Solution Overview
Problem
Resin particles with low recovery rates fail to provide sufficient scratch resistance and solvent resistance, making them unsuitable for coating materials, especially those with high solvent content or binder resins with low recovery rates.
Innovation Solution
Resin particles with a specific monomer mixture composition, including monofunctional (meth)acrylic ester monomers and specific glycol di(meth)acrylates, are produced through suspension polymerization, achieving a recovery rate of 15-30% and excellent solvent resistance, and are used in coating materials to enhance scratch resistance and matte properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resin particles with low compression strength (0.01 to 0.6 kgf/mm²) are used to provide soft touch feeling, then the coating film has soft feel properties, but the recovery rate is less than 15% and scratch resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compression strength within 0.03 to 0.5 kgf/mm² and recovery rate within 15% to 40%, transforming the resin particles' mechanical properties to simultaneously achieve soft touch feeling and adequate scratch resistance. This is accomplished through controlled polymerization of specific monomer compositions including (meth)acrylic esters and crosslinking agents.
Solution Approach 2:
The patent creates composite resin particles by combining multiple monomer types ((meth)acrylic esters, crosslinking agents, and functional monomers) that work together to provide both softness and durability. The composite polymer structure enables the particles to exhibit both soft touch properties and improved scratch resistance when used in coating materials.
2Reliability
If resin particles with high recovery rate (30 to 40%) are used to provide excellent scratch resistance, then the coating film has high elasticity, but the solvent resistance becomes insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the recovery rate to a balanced range of 15% to 40% and controlling the monomer composition ratios, which simultaneously improves both scratch resistance and solvent resistance. The controlled polymerization process creates a polymer network that maintains structural integrity in solvent environments while providing elastic recovery.
Solution Approach 2:
The patent develops composite resin particles incorporating crosslinking agents and functional monomers that enhance both mechanical properties and chemical resistance. The crosslinked polymer structure provides solvent resistance while the controlled flexibility maintains scratch resistance, resolving the contradiction between these two properties.
3Illumination intensity
If inorganic particles such as silica and talc are used to reduce gloss and provide matte coating, then the coating film has matte appearance, but the touch feeling becomes hard and scratch resistance decreases
Solution Approach 1:
The patent applies parameter changes by transitioning from inorganic particles to organic resin particles with specific compression strength (0.03 to 0.5 kgf/mm²) and recovery rate (15% to 40%), which fundamentally changes the tactile properties of the coating film. The resin particles provide soft touch feeling while maintaining matte appearance through controlled light scattering.
Solution Approach 2:
The patent replaces durable inorganic particles with organic resin particles that offer superior tactile properties. Although resin particles are organic and can be processed more easily, they provide the desired soft feel and scratch resistance that inorganic particles cannot achieve, effectively substituting one material system for another with improved performance characteristics.
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 resin particles provide excellent scratch resistance and solvent resistance, enabling the formation of coating films with improved durability and matte appearance, suitable for various applications including optical films and external preparations.
Implementation Method 1
Resin particles with a specific monomer mixture composition, including monofunctional (meth)acrylic ester monomers and specific glycol di(meth)acrylates, are produced through suspension polymerization
Data Source
AI summary
The present invention provides resin particles including polymer obtained of a monomer mixture containing a monofunctional (meth)acrylic ester monomer, a monomer represented by a general formula (I); CH2=C(R1)-COO-(CH2CH2O)n-CO-C(R1)-CH2 (I) where R1 is a hydrogen or a methyl group and n is an integer from 1 to 4, and a monomer represented by a general formula (II); CH2-C(R2)-COO-(CH2CH2O)m-CO-C(R2)=CH2 (II) where R2 is a hydrogen or a methyl group and m is an integer from 5 to 15. The resin particles have a volume average particle diameter of 5 to 50 µm, a recovery rate of 15% or more to less than 30%, and a compression strength (MPa) that provides a multiplication product in the range of 24.5 to 60.0 obtained by multiplying the compression strength and the volume average particle diameter (µm).