Liquid Solder Resist Composition with Dual-Method Titanium Dioxide
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Solution Overview
Problem
Solder resist layers containing rutile titanium dioxide manufactured by different methods suffer from low light reflectivity, UV-induced deterioration, and color changes, making it difficult to maintain high reflectivity and whiteness.
Innovation Solution
A liquid solder resist composition combining carboxyl group-containing resin, photopolymerizable compounds, photopolymerization initiators, titanium dioxide, and a compound with a cyclic ether skeleton, which includes both rutile titanium dioxide from sulfuric acid and chlorine methods, to form a solder resist layer with enhanced reflectivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rutile titanium dioxide manufactured by the sulfuric acid method is used, then deterioration due to ultraviolet rays and heat is suppressed, but light reflectivity is low
Solution Approach 1:
The patent combines two different types of rutile titanium dioxide (manufactured by sulfuric acid method and by chlorine method) in a solder resist composition. The sulfuric acid method titanium dioxide provides UV and heat resistance, while the chlorine method titanium dioxide provides high light reflectivity. By merging these two materials, the composition achieves both deterioration resistance and high reflectivity simultaneously.
2Illumination intensity
If rutile titanium dioxide manufactured by the chlorine method is used, then light reflectivity is high, but the solder resist layer turns yellow due to ultraviolet rays
Solution Approach 1:
The patent combines two different types of rutile titanium dioxide (manufactured by sulfuric acid method and by chlorine method) in a solder resist composition. The sulfuric acid method titanium dioxide provides UV and heat resistance, while the chlorine method titanium dioxide provides high light reflectivity. By merging these two materials, the composition achieves both deterioration resistance and high reflectivity simultaneously.
3Device complexity
If anatase titanium dioxide is used, then the composition is simple, but the solder resist layer has low reflectivity and large deterioration due to ultraviolet rays and heat
Solution Approach 1:
The patent uses a composite material system consisting of two different types of rutile titanium dioxide particles with different manufacturing methods. This composite approach provides both high light reflectivity and resistance to UV and heat deterioration, overcoming the limitations of single-material compositions while maintaining practical complexity.
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 achieves a solder resist layer with high reflectivity and suppressed deterioration due to light, maintaining whiteness and preventing yellowing, ensuring improved performance and longevity.
Implementation Method 1
a photopolymerizable compound containing at least one compound selected from a group consisting of a photopolymerizable monomer and a photopolymerizable prepolymer, and a photopolymerization initiator
Implementation Method 2
the solder resist layer is whitened, which allows light emitted from light-emitting elements to efficiently reflect off the solder resist layer
Data Source
AI summary
A liquid solder resist composition contains a carboxyl group-containing resin, a photopolymerizable compound containing at least one compound selected from a group consisting of a photopolymerizable monomer and a photopolymerizable prepolymer, a photopolymerization initiator, a titanium dioxide, and a compound having a cyclic ether skeleton. The titanium dioxide contains both of a rutile titanium dioxide manufactured by a sulfuric acid method and a rutile titanium dioxide manufactured by a chlorine method.