Photocurable Coating Composition with Minute Core-Shell Polymer Particles
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Solution Overview
Problem
Conventional photocurable coating compositions fail to achieve a balance between mechanical physical properties and cross-link density, and the dispersion of core-shell fine polymer particles in these compositions often results in aggregated particles that impair the appearance and mechanical properties of the coating film.
Innovation Solution
A photocurable coating composition is developed using a minute core-shell graft polymer particle with a volume average particle diameter between 0.05 µm and 1 µm, primarily dispersed in a vinyl monomer containing urethane-modified (meth)acrylate, (meth)acrylic acid ester monomers, and aromatic vinyl monomers, which improves the mechanical and appearance properties of the coating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If core-shell fine polymer particles are added to improve mechanical properties, then abrasion resistance and flexibility are improved, but the particles aggregate and impair the appearance of the coating film
Solution Approach 1:
The patent changes the particle size parameter of the core-shell polymer particles from conventional larger sizes to fine particles with a volume average particle diameter of 0.05 to 1 µm. This parameter change prevents aggregation and maintains appearance while preserving mechanical property improvements
Solution Approach 2:
The patent uses core-shell structured polymer particles as a composite material component. The core-shell structure provides mechanical reinforcement while the fine particle size ensures uniform dispersion and prevents aggregation, simultaneously achieving improved mechanical properties and maintained appearance
2Strength
If polymer particles are dispersed in the coating composition, then mechanical properties are improved, but the dispersion state becomes aggregated
Solution Approach 1:
The patent changes the particle size parameter to 0.05 to 1 µm volume average diameter, which prevents aggregation and maintains stable dispersion in the coating composition while providing mechanical reinforcement
Solution Approach 2:
The patent applies core-shell structure with different properties in core and shell regions. The shell layer provides compatibility with the coating matrix while the core provides mechanical strength, enabling stable dispersion and preventing aggregation
3Volume of moving object
If conventional fine polymer particles are used, then particle size is reduced, but aggregation still occurs and appearance is impaired
Solution Approach 1:
The patent optimizes the particle size parameter to a specific range of 0.05 to 1 µm volume average diameter. This precise parameter control prevents aggregation and maintains appearance quality while providing mechanical reinforcement
Solution Approach 2:
The patent uses core-shell structured particles where the shell layer composition and structure are designed to prevent aggregation. The composite structure maintains particle separation and uniform dispersion, preventing appearance degradation
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 forms a coating film with excellent mechanical properties and appearance, achieving improved abrasion resistance and flexibility without the appearance-related issues of aggregated particles, by effectively dispersing the minute polymer particles in a primary particle state within the vinyl monomer.
Implementation Method 1
a photocurable coating composition which comprises 100 parts by mass of the vinyl monomer (A) and not less than 0.1 parts by mass and not more than 50 parts by mass of a minute polymer particle (B)
Data Source
AI summary
The photocurable coating composition according to the present invention is characterized in comprising 100 parts by mass of a vinyl monomer (A) and not less than 0.1 parts by mass and not more than 50 parts by mass of a minute polymer particle (B); wherein the volume average particle diameter of the minute polymer particle (B) is not less than 0. 05 µm and not more than 1 µm, the vinyl monomer (A) contains one or more polymers selected from the group consisting of a (meth) acrylic acid ester monomer, hydroxyethyl (meth)acrylate and a urethane-modified (meth)acrylate as a main component; and the (meth)acrylic acid ester monomer is synthesized from an alcohol having not less than 3 carbon atoms and (meth)acrylic acid.