Polymerizable Lens Composition for Reduced-Striae Optical Components
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Solution Overview
Problem
Existing polymerizable compositions for plastic lenses form cross-linked structures at low temperatures, leading to rapid viscosity increase and the generation of striae, which are unsuitable for high-quality optical components.
Innovation Solution
A polymerizable composition comprising alicyclic polyisocyanate and non-cyclic aliphatic polyisocyanate, combined with specific polythiols, is used to reduce striae and enhance tensile strength in optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a polythiol compound with multiple SH groups is used to form cross-linked structure at low temperature, then heat resistance is improved, but viscosity increases rapidly and striae are generated
Solution Approach 1:
The patent changes the chemical structure parameters of the polythiol compound from conventional types to specific compounds with controlled molecular weight and functional group distribution. This parameter modification allows the material to maintain cross-linking capability for heat resistance while reducing the rate of viscosity increase during polymerization, thereby preventing striae formation.
Solution Approach 2:
The patent creates a composite polymer system by combining the specific polythiol compound with polyisocyanate and additional functional monomers. This composite approach balances the cross-linking density needed for heat resistance with the flow characteristics required to prevent striae, achieving both properties simultaneously.
2Productivity
If cross-linked structure is formed at low temperature, then productivity is improved, but viscosity increase is fast and striae are generated
Solution Approach 1:
The patent modifies the reaction parameters by selecting specific polythiol compounds with optimized functional group reactivity. This enables the polymerization to proceed at low temperature with controlled viscosity development, maintaining both fast curing and high optical quality without striae.
3Temperature
If conventional polymerizable composition is used, then refractive index is achieved, but striae are generated reducing optical quality
Solution Approach 1:
The patent changes the molecular parameters of the polythiol compound to achieve the desired refractive index through controlled cross-linking density, while simultaneously maintaining optical uniformity by preventing striae formation through optimized viscosity characteristics during curing.
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 allows for the production of optical components with reduced striae, high refractive index, low dispersion, and excellent tensile strength, suitable for applications in optical devices such as spectacle and camera lenses.
Implementation Method 1
a polymerizable composition comprising an isocyanate component comprising alicyclic polyisocyanate (A-1) and non-cyclic aliphatic polyisocyanate (A-2); and a polythiol component comprising polythiol (B-1) and polythiol (B-2)
Implementation Method 2
an optical component obtained by polymerizing the present composition
Data Source
AI summary
Provided are a polymerizable composition allowing obtainment of an optical component with reduced striae, an optical component obtained from the polymerizable composition, a plastic lens containing the optical component, and a spectacle lens including a lens substrate including the optical component. The polymerizable composition of the present invention contains an isocyanate component which contains alicyclic polyisocyanate (A-1) having two or more isocyanate groups and non-cyclic aliphatic polyisocyanate (A-2) having two or more isocyanate groups, and a polythiol component which contains polythiol (B-1) having four or more mercapto groups and two or more sulfide bonds and polythiol (B-2) having two or three mercapto groups and two or three ester bonds. The optical component of the present invention is obtained by polymerizing the polymerizable composition of the present invention. The plastic lens of the present invention contains the optical component of the present invention. The spectacle lens of the present invention includes a lens substrate which includes the optical component of the present invention.