Polymer Molding Material Stabilizer Surface Adhesion
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Solution Overview
Problem
Existing molding materials for optical pickup devices using blue-violet laser light sources suffer from deterioration of optical properties, heat resistance issues, and instability during high-temperature use, leading to inadequate light transmittance and foaming problems.
Innovation Solution
A molding material comprising a polymer with an alicyclic structure, combined with a phenolic stabilizer and a hindered amine light stabilizer, where the stabilizers are adhered to the surface of the polymer particles, providing enhanced heat resistance and light stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional molding materials are used for blue-violet laser optical components, then manufacturing cost is low and ease of manufacture is good, but optical properties deteriorate under UV exposure and heat resistance is insufficient
Solution Approach 1:
The patent uses a composite material consisting of a cyclic olefin polymer base resin combined with specific stabilizers (hindered amine light stabilizer and phenolic stabilizer). This composite structure provides both the manufacturability of conventional plastics and the enhanced optical stability and heat resistance required for blue-violet laser applications.
Solution Approach 2:
The patent changes the chemical composition parameters by selecting specific types of hindered amine light stabilizers and phenolic stabilizers with appropriate molecular weights and structures. This parameter optimization ensures the molding material maintains stability under UV exposure while remaining processable through conventional molding methods.
2Reliability
If stabilizers are added to improve light resistance, then optical property stability improves, but foaming occurs during molding
Solution Approach 1:
The patent carefully controls the concentration parameters of stabilizers within specific ranges (hindered amine light stabilizer: 0.01-5% by mass, phenolic stabilizer: 0.01-1% by mass). This parameter optimization prevents foaming during molding while maintaining sufficient light resistance and optical stability.
3Temperature
If thicker protective substrate is used, then manufacturing is easier and heat resistance is better, but light transmittance decreases and recording density is reduced
Solution Approach 1:
The patent changes the material composition parameters by incorporating stabilizers that enable the polymer to maintain structural integrity and heat resistance at thinner substrate thicknesses. This allows achieving both high light transmittance and sufficient heat resistance simultaneously.
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 solution maintains high optical properties and light transmittance even under UV exposure, preventing deterioration and ensuring stable performance in optical components for blue-violet laser applications.
Implementation Method 1
at least a part of the phenolic stabilizer and hindered amine light stabilizer is adhering to surface of particles of the polymer
Implementation Method 2
maintains high optical properties and light transmittance even under UV exposure, preventing deterioration
Data Source
AI summary
A molding material of the present invention includes a polymer having a repeating structural unit whose part or whole contains an alicyclic structure, a phenolic stabilizer, a hindered amine light stabilizer and a phosphorus stabilizer, in which at least a part of the phenolic stabilizer and/or hindered amine light stabilizer is presently adhering to the surface of particles of the above polymer.