Thermosetting Resin Composition UV Shielding
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Solution Overview
Problem
The challenge of unintentional back surface exposure in printed wiring boards due to ultraviolet ray transmission through substrates, particularly exacerbated by reduced substrate thickness, remains unsolved in existing epoxy resin compositions.
Innovation Solution
A thermosetting resin composition incorporating a curing agent with a Gardner color scale of 15 or more, specifically a naphthalene type phenolic resin, is used, which absorbs ultraviolet rays effectively, reducing transmission and enhancing UV shielding ability in the cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If substrate thickness is reduced to achieve miniaturization, then productivity and device integration are improved, but UV shielding ability deteriorates causing unintentional back surface exposure
Solution Approach 1:
The invention changes the chemical composition parameters of the epoxy resin system by selecting specific epoxy resins with appropriate molecular structures and using curing agents with high UV absorption capability (Gardner color scale ≥15), thereby achieving effective UV shielding in thin substrates without compromising device integration
Solution Approach 2:
The invention creates a composite material system combining specific epoxy resins with high UV-absorbing curing agents (naphthalene type phenolic resins, amine curing agents with Gardner color scale ≥15) to achieve both thin substrate requirements and effective UV shielding performance
2Ease of manufacture
If conventional epoxy resin compositions are used, then manufacturing simplicity is maintained, but UV shielding ability is insufficient leading to back surface exposure
Solution Approach 1:
The invention modifies the chemical parameters of the resin composition by selecting curing agents with specific properties (Gardner color scale ≥15, such as naphthalene type phenolic resins or amine curing agents) while maintaining the same manufacturing process, thereby achieving improved UV shielding without complicating production
3Object-affected harmful factors
If UV shielding is improved by adding pigments or dyes, then back surface exposure is prevented, but heat resistance and flame resistance deteriorate
Solution Approach 1:
The invention converts the typically harmful dark-colored curing agents (which absorb UV strongly) into beneficial components by selecting those with high Gardner color scale (≥15) that provide UV shielding while maintaining or improving heat resistance and flame resistance properties, thus turning potential negatives into positives
Solution Approach 2:
The invention changes the parameter of curing agent selection from conventional light-colored agents to dark-colored agents with Gardner color scale ≥15, which simultaneously provide UV shielding and maintain thermal performance, eliminating the need for separate pigment additions
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 provides a cured product with excellent UV shielding capability, preventing unintentional back surface exposure and improving heat resistance, flame resistance, and dimensional stability.
Implementation Method 1
A 3 mass % methyl ethyl ketone solution of the curing agent has a Gardner color scale of 15 or more... the curing agent accounts for 10 mass % or more of a total solid content of the thermosetting resin composition... absorbs ultraviolet rays effectively, reducing transmission
Data Source
AI summary
A thermosetting resin composition contains a thermosetting resin and an inorganic filler. The thermosetting resin includes a curing agent. A 3 mass % methyl ethyl ketone solution of the curing agent has a Gardner color scale of 15 or more. The content of the curing agent accounts for 10 mass % or more of a total solid content of the thermosetting resin composition.