Transparent Plastic Lens Composition for Blue Light Absorption
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Solution Overview
Problem
Existing transparent plastic substrates and lenses do not effectively cut blue light, particularly in the 380-500 nm wavelength range, which poses a risk to eye health due to high energy levels and potential retina damage.
Innovation Solution
Incorporating a benzotriazole compound with a specific mesomeric effect into a transparent plastic substrate, specifically formulated with a (thio)urethane resin, enhances the blue light cut rate to ≥ 50% at 410 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a multilayer film is disposed on a convex surface of a plastic member to reduce glare, then the visibility and contrast are enhanced, but the blue light cut rate is insufficient (approximately 30%)
Solution Approach 1:
The patent extracts the blue light cutting function from the multilayer film structure and implements it through a chemical additive (benzotriazole compound with mesomeric effect group) incorporated into the plastic substrate itself. This eliminates the need for complex multilayer film deposition while achieving superior blue light cut rate of 35% or more.
Solution Approach 2:
The patent changes the chemical composition parameter of the plastic substrate by incorporating a benzotriazole compound with a mesomeric effect group. This chemical modification enables the substrate to inherently absorb blue light with wavelengths of 380 nm or shorter, achieving a blue light cut rate of 35% or more without requiring additional film structures.
2Object-affected harmful factors
If conventional ultraviolet ray absorbents are used to protect against blue light, then some protection is provided, but the cut rate in the 380-500 nm range is insufficient
Solution Approach 1:
The patent modifies the protective parameter by using a benzotriazole compound with a mesomeric effect group, which changes the absorption spectrum to effectively cover the 380-500 nm blue light range. This chemical parameter change achieves a blue light cut rate of 35% or more, significantly improving protection effectiveness compared to conventional ultraviolet ray absorbents.
Solution Approach 2:
The patent creates a composite material system by combining the plastic substrate with a benzotriazole compound featuring a mesomeric effect group. This composite structure provides synergistic protection, where the benzotriazole compound specifically targets blue light wavelengths while the plastic substrate maintains its optical properties, achieving both high protection effectiveness and visual quality.
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 provides a transparent plastic substrate and lens with a high blue light cut rate, achieving ≥ 50% at 410 nm and ≥ 35% across 380-500 nm, while maintaining high transmittance and reducing glare.
Implementation Method 1
a benzotriazole compound having a particular structure containing a group imparting a mesomeric effect into a transparent plastic substrate... achieves a high blue light cut rate of 35% or more in the 380-500 nm range
Data Source
AI summary
To provide a transparent plastic substrate having a high cut rate of blue light, a plastic lens and a transparent plastic member, the invention provides a transparent plastic substrate comprising (i) a resin component constituting the transparent plastic substrate, selected from a thiourethane resin formed of a combination of a polythiol compound containing 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane and a polyisocyanate compound containing an alicyclic isocyanate, provided that isophorone diisocyanate is excluded; and (ii) 0.10-2.00 parts by mass, per 100 parts by mass of the resin component constituting the transparent plastic substrate, of a benzotriazole compound of the formula (1-1): wherein R1 is C1-3-alkyl or C1-3-alkoxy, m is 0 or 1, and R2 is C1-12-alkyl or C1-12-alkoxy. Also provided is a plastic lens comprising the above transparent plastic substrate.