Dual-Peroxide Allyl Carbonate Lens Composition for Optical Clarity
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Solution Overview
Problem
Existing methods for manufacturing plastic lenses, such as those described in Patent Documents 1 and 2, suffer from issues like surface turbidity, foreign matter generation, cracks, and decreased yield, which impair the transparency and physical properties of the lenses.
Innovation Solution
A polymerizable composition for optical materials comprising an allyl carbonate compound with specific radical polymerization initiators, including peroxyester-based and other radical polymerization initiators, is used to enhance surface hardness and suppress optical distortion and mold leakage during polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymerization initiators are used in existing methods, then the manufacturing process is simple, but surface turbidity and foreign matter generation occur, impairing transparency
Solution Approach 1:
The patent changes the chemical parameters of the polymerization initiators, specifically using a combination of an aliphatic organic peroxide with 10-hour half-life temperature of 75°C or lower and another with 80-100°C half-life temperature. This parameter optimization controls the polymerization rate and radical concentration to prevent surface turbidity and foreign matter generation while maintaining transparency.
Solution Approach 2:
The patent employs a composite initiator system combining two different peroxides with complementary half-life temperatures. This composite approach allows simultaneous control of polymerization initiation and propagation rates, eliminating surface defects while preserving optical clarity.
2Productivity
If conventional polymerization methods are used, then the process is straightforward, but cracks generate in the lens and product yield decreases
Solution Approach 1:
The patent optimizes polymerization parameters by selecting peroxides with specific half-life temperatures (75°C or lower and 80-100°C). This parameter control ensures uniform polymerization throughout the lens material, preventing stress concentration and crack formation while maximizing product yield.
Solution Approach 2:
The dual-peroxide system provides continuous and controlled polymerization action at different stages. The first peroxide initiates polymerization at lower temperatures, while the second peroxide maintains polymerization at higher temperatures, ensuring complete conversion without generating cracks that would reduce yield.
3Strength
If single-type polymerization initiators are used, then the composition is simple, but surface hardness is insufficient and optical distortion occurs
Solution Approach 1:
The patent uses a composite initiator system with two different peroxides having different half-life temperatures. This composite approach enables simultaneous achievement of high surface hardness through controlled crosslinking and suppression of optical distortion through uniform polymerization distribution.
Solution Approach 2:
By changing the thermal parameters of the initiators (half-life temperatures of 75°C or lower and 80-100°C), the patent achieves optimal balance between surface hardness and optical clarity, preventing both insufficient hardness and optical distortion.
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 lenses with excellent surface hardness, transparency, and reduced optical distortion, while improving product yield and suppressing mold leakage, thereby enhancing the overall quality and productivity of the manufacturing process.
Implementation Method 1
a radical polymerization initiator (B), wherein the radical polymerization initiator (B) includes at least one kind of radical polymerization initiator (B1) which is a peroxyester-based radical polymerization initiator
Implementation Method 2
an aliphatic organic peroxide having a 10-hour half-life temperature of 75° C. or lower, and an aliphatic organic peroxide having a 10-hour half-life temperature of 80 to 100° C.
Data Source
AI summary
A polymerizable composition for an optical material includes: an allyl carbonate compound (A) including two or more allyloxycarbonyl groups at a terminal which is represented by General Formula (1); and a radical polymerization initiator (B). The radical polymerization initiator (B) includes at least one kind of radical polymerization initiator (B1) which is a peroxyester-based radical polymerization initiator, and a radical polymerization initiator (B2).