Polymerizable Composition for Optical Materials Viscosity Control
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Solution Overview
Problem
The existing methods for producing photochromic polythiourethane resins are inefficient due to the need for mixing polymer particles with a polymerizable monomer, leading to increased viscosity and reduced production efficiency.
Innovation Solution
A polymerizable composition for optical materials is developed, comprising a polyester polyol, a photochromic compound, and a polymerization reactive compound, which suppresses viscosity increase and enhances handling properties, photochromic characteristics, heat resistance, and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer particles containing photochromic compound are prepared in advance and then mixed with polymerizable monomer, then photochromic performance is achieved, but production process becomes long and production efficiency is significantly reduced
Solution Approach 1:
The patent combines the photochromic compound directly into the polymerizable composition before polymerization, merging the photochromic functionality with the resin synthesis process. This eliminates the separate step of preparing pre-formed polymer particles and mixing them later, thereby maintaining photochromic performance while significantly improving production efficiency.
Solution Approach 2:
The photochromic compound is incorporated into the polymerizable composition in advance, before polymerization occurs. This preliminary incorporation allows the photochromic properties to be established during the resin formation process itself, rather than requiring subsequent processing steps, thus enhancing productivity without compromising performance.
2Ease of manufacture
If polymer particles containing photochromic compound are mixed with polymerizable monomer, then resin can be produced, but viscosity of polymerizable composition is easily increased
Solution Approach 1:
The patent changes the physical state and distribution parameters of the photochromic compound by incorporating it at the molecular level into the polymerizable composition before polymerization. This prevents aggregation and maintains low viscosity during mixing and processing, while still achieving the desired resin production.
3Ease of manufacture
If polymer particles and polymerizable monomer are mixed, then resin production is possible, but reactivity between them is high causing pot life to be shortened
Solution Approach 1:
The photochromic compound is incorporated into the polymerizable composition before polymerization begins, allowing for controlled reaction kinetics. This preliminary incorporation ensures uniform distribution and controlled reactivity throughout the composition, extending the pot life while maintaining ease of manufacture.
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 provides an optical material with excellent handling properties, photochromic characteristics, heat resistance, and mechanical properties, improving the efficiency of resin production and reducing the risk of viscosity-related issues.
Implementation Method 1
a photochromic compound (b), and a polymerization reactive compound (c)
Data Source
AI summary
The polymerizable composition for optical materials of the present invention includes a polyester polyol (a), a compound (b) of which light absorption characteristics vary by sensing changes in environment; and a polymerization reactive compound (c).