Optical Article Primer Layer for Photochromic Adhesion
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Solution Overview
Problem
Existing optical articles with photochromic layers face challenges in achieving strong adhesive properties between the photochromic layer and the substrate, which affects their performance and durability.
Innovation Solution
A polymerizable composition for forming a primer layer containing polyisocyanate and hydroxy group-containing (meth)acrylate is used to enhance the adhesive property between the photochromic layer and the substrate, comprising a polymerizable composition for the primer layer that includes a polyisocyanate and a hydroxy group-containing (meth)acrylate, which forms a cured layer on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional photochromic layer is applied directly to a substrate, then the manufacturing process is simple, but the adhesive property between the photochromic layer and substrate is insufficient
Solution Approach 1:
A primer layer is introduced as an intermediary between the substrate and the photochromic layer. This primer layer contains a polymerizable composition with specific functional groups that enhance bonding to both the substrate and the photochromic layer, thereby improving adhesive properties without compromising the overall structure.
Solution Approach 2:
The coating system is segmented into distinct functional layers: a primer layer for adhesion enhancement and a photochromic layer for optical functionality. This segmentation allows each layer to be optimized independently for its specific function, improving overall performance.
2Reliability
If a primer layer with polyisocyanate and hydroxy group-containing (meth)acrylate is used, then the adhesive property is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The primer layer is applied and cured before applying the photochromic layer. This preliminary action ensures that the adhesive interface is established first, providing a stable foundation for subsequent layers and simplifying the overall manufacturing process despite the additional step.
Solution Approach 2:
The polymerizable composition in the primer layer contains specific components (polyisocyanate and hydroxy group-containing (meth)acrylate) in controlled amounts. By adjusting the parameters of composition and curing conditions, optimal adhesive properties are achieved while maintaining manufacturing efficiency.
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 enhanced adhesive property between the substrate and the photochromic layer results in improved durability and performance of the optical article, ensuring better bonding and stability of the photochromic layer.
Implementation Method 1
a primer layer generated by curing a polymerizable composition for forming the primer layer
Implementation Method 2
the polymerizable composition for forming the primer layer contains a component A: polyisocyanate, and a component B: hydroxy group-containing (meth)acrylate
Implementation Method 3
A photochromic compound is a compound having a property of coloring upon irradiation with light in a wavelength range where the photochromic compound has optical responsivity and fading in the absence of irradiation (photochromic properties)
Data Source
AI summary
Provided is an optical article having a substrate, a primer layer generated by curing a polymerizable composition for forming the primer layer, and a photochromic layer generated by curing a (meth)acrylate-based polymerizable composition containing a photochromic compound in this order, in which the polymerizable composition for forming the primer layer contains a component A: polyisocyanate and a component B: hydroxy group-containing (meth)acrylate.