Episulfide Optical Material Mold Releasability
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Solution Overview
Problem
Plastic lenses produced from episulfide compounds often suffer from poor mold releasability, surface accuracy issues, and reduced transparency due to uneven reactions and striae formation during polymerization, leading to defects and reduced yield rates.
Innovation Solution
A composition containing specific episulfide compounds represented by formulas (1) and (2), along with 1,2,3,5,6-pentathiepane and a polythiol, is used, with controlled ratios and addition of a polymerization catalyst to improve mold releasability, transparency, and reduce striae formation during polymerization and curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyepisulfide compounds are used to achieve high refractive index and high Abbe number, then optical properties are improved, but mold releasability deteriorates causing lens breakage during demolding
Solution Approach 1:
The patent modifies the chemical composition parameters of the episulfide compound by incorporating specific ratios of compounds with formulas (1) and (2), along with 1,2,3,5,6-pentathiepane and polythiol, to optimize both optical properties and mold releasability simultaneously
Solution Approach 2:
The invention creates a composite material system combining multiple episulfide compounds (formulas 1 and 2) with 1,2,3,5,6-pentathiepane and polythiol, where each component contributes different properties to achieve overall balance between optical performance and manufacturability
2Reliability
If episulfide compound compositions are polymerized to achieve high refractive index, then optical properties are improved, but transparency deteriorates due to striae formation
Solution Approach 1:
The patent optimizes the compositional parameters and reaction conditions to control the polymerization process, preventing striae formation while maintaining high refractive index through precise formulation control
Solution Approach 2:
The invention ensures homogeneous distribution and reaction of the episulfide compounds and additives during polymerization, eliminating striae and achieving uniform transparency throughout the optical material
3Reliability
If episulfide compound compositions are used to achieve high refractive index, then optical properties are improved, but peeling prevention deteriorates causing lens peeling from mold during polymerization
Solution Approach 1:
The patent adjusts the chemical composition parameters and reaction conditions to control the polymerization process, ensuring uniform curing that prevents lens peeling while maintaining high refractive index
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 effectively enhances mold releasability, prevents peeling defects, and achieves high transparency and low striae levels in optical materials, thereby improving the quality and yield of optical lenses.
Implementation Method 1
adding a polymerization catalyst to the composition for optical materials according to any one of items (2) to (7) in an amount of 0.0001 to 10% by mass relative to the total amount of the composition for optical materials, followed by polymerization and curing
Data Source
AI summary
Provided is a composition for optical materials that gives optical materials which can have at least one improved property selected from among satisfactory mold releasability after polymerization and curing, unsusceptibility to separation from the mold during polymerization and curing, transparency, and low-level striae. The present invention further provides a compound represented by formula (1). The composition for optical materials comprises the compound represented by formula (1) and a compound represented by formula (2). (In formula (1), X1 and X2 represent O or S, provided that both X1 and X2 are O or that X1 is O and X2 is S.)