Optical Polymerizable Composition for Clear Photochromic Materials
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Solution Overview
Problem
Conventional techniques for producing polymerizable compositions for optical materials often result in white turbidity, fine aggregates, and optical distortion, affecting transparency and performance.
Innovation Solution
A specific process involving the mixing of a polyisocyanate compound, a polymer, a photochromic compound, and an internal release agent under controlled conditions, with precise amounts of an internal release agent and polymerization catalyst, to produce a polymerizable composition that suppresses fine aggregates and optical distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional techniques are used to produce polymerizable composition for optical materials, then the production process is simple, but white turbidity, fine aggregates, and optical distortion occur affecting transparency
Solution Approach 1:
The patent applies parameter changes by precisely controlling the amounts of internal release agent (500-3000 ppm) and polymerization catalyst (200-500 ppm), and by controlling mixing time (2 hours or less). These parameter optimizations suppress fine aggregate formation and optical distortion while maintaining production feasibility, thereby resolving the contradiction between manufacturing precision and process complexity.
2Reliability
If polymer particles encapsulating photochromic compound are used, then photochromic performance is improved, but white turbidity and fine aggregates are formed affecting transparency
Solution Approach 1:
The patent resolves this contradiction by optimizing parameter combinations: using specific polymer types with controlled molecular weights, precise catalyst amounts (200-500 ppm), and limited mixing time (2 hours or less). These parameter changes enable the formation of uniformly dispersed polymer particles that encapsulate photochromic compounds without causing excessive aggregation or turbidity, thus maintaining both photochromic performance and transparency.
3Stability of the object's composition
If mixing time is extended to ensure homogeneous composition, then composition uniformity is improved, but fine aggregates and optical distortion increase
Solution Approach 1:
The patent applies preliminary action by pre-mixing the internal release agent with the polymer and photochromic compound before adding the polymerization catalyst. This preliminary mixing step ensures homogeneous distribution of components without excessive mixing time, preventing fine aggregate formation and optical distortion while achieving composition uniformity.
Solution Approach 2:
The patent optimizes mixing time to 2 hours or less and controls catalyst amount to 200-500 ppm. These parameter changes prevent excessive mixing that would cause aggregate formation, while still achieving sufficient composition uniformity for optimal optical quality and photochromic performance.
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 method results in an optical material with excellent transparency and photochromic performance, minimizing the formation of fine aggregates and optical distortion.
Implementation Method 1
a technique has been proposed in which the aggregation of a photochromic compound in a polymerizable composition for optical materials or a resin for optical materials is suppressed and the dispersibility of the photochromic compound is improved
Implementation Method 2
a polymerizable composition for optical materials that contains a specific polymer, a photochromic compound, and a polymerizable compound and a process for producing the composition
Data Source
AI summary
A process for producing a polymerizable composition for optical materials of the present invention includes a step A of mixing together a polyisocyanate compound (i), a polymer (ii) represented by General Formula (ii), a photochromic compound (iii), and an internal release agent (iv), a step B of mixing a mixed solution obtained by the step A with a polythiol compound (v), and a step C of further mixing a mixed solution obtained by the step B with a polymerization catalyst (vi) so as to obtain a polymerizable composition for optical materials, wherein in the step A, the internal release agent (iv) is added so that a content thereof in the polymerizable composition for optical materials is 500 to 3,000 ppm, and in the step C, the polymerization catalyst (vi) is added so that a content thereof in the polymerizable composition for optical materials is 120 to 500 ppm.