Polyolefin Photochromic Lens Composition
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Solution Overview
Problem
Existing plastic lenses combining polyolefins and photochromic compounds often fail to exhibit photochromic performance effectively, as previously disclosed documents do not adequately describe lenses with a polyolefin substrate or photochromic film laminated to a lens substrate.
Innovation Solution
A composition for optical materials comprising a polyolefin obtained by copolymerizing specific olefins such as propylene, 1-butene, and 4-methyl-1-pentene, combined with a photochromic compound represented by a specific general formula, which is used to create a lens substrate or a photochromic film laminated to a lens substrate, optimizing the content of branched olefin units and incorporating a photochromic compound to enhance photochromic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyolefin and a photochromic compound are combined in a plastic lens, then the lens is light and crack-resistant, but photochromic performance is not exhibited in some cases
Solution Approach 1:
The patent changes the chemical parameters of the polyolefin by specifying precise compositional ratios (polyalphaolefin 70-90 wt%, polyethylene 10-30 wt%) and incorporating specific additives (polymerizable monomers, photoinitiators, chain transfer agents) to enable photochromic performance while maintaining material compatibility
Solution Approach 2:
The patent creates a composite material system combining polyolefin base resin with photochromic compounds, where the specific composition ratios and additional components (polymerizable monomers, photoinitiators) ensure both structural integrity and photochromic functionality are achieved simultaneously
2Reliability
If a photochromic compound is added to a polymer material, then photochromic properties are achieved, but the polymer material requires specific composition ratios and additives to function properly
Solution Approach 1:
The patent specifies precise parameter ranges for each component (polyalphaolefin 70-90 wt%, polyethylene 10-30 wt%, photochromic compound 0.01-10 wt%) and introduces controlled amounts of auxiliary substances (polymerizable monomers 1-50 wt%, photoinitiators 0.1-10 wt%) to achieve photochromic functionality while maintaining manageable compositional complexity
Solution Approach 2:
The patent introduces polymerizable monomers and photoinitiators as intermediary substances that mediate between the polyolefin base and photochromic compound, enabling the photochromic effect to occur within the polymer matrix through controlled polymerization reactions
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 achieves excellent photochromic performance in optical materials, ensuring the lens substrate or film exhibits significant color change upon UV exposure, meeting the requirements for applications like eyeglass lenses.
Implementation Method 1
a photochromic compound (B)... excellent in photochromic performance... exhibits significant color change upon UV exposure
Data Source
AI summary
A composition for optical materials of the present invention includes a polyolefin (A) obtained by (co)polymerizing at least one kind of olefin selected from α-olefins having 3 to 20 carbon atoms and a photochromic compound (B).