Plastic Lens Coating Adhesion via Hydrogen Bonding
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Solution Overview
Problem
Existing plastic lenses for spectacles lack sufficient abrasion resistance and adhesion between the substrate and the cured film, despite advancements in refractive index and processability.
Innovation Solution
A plastic lens with a substrate containing a resin having an NHCO structure or a unit derived from a specific compound, combined with a coating composition comprising organosilicon compounds, amino group-containing compounds, and isocyanate group-containing compounds, which form hydrogen bonds to enhance adhesion and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cured film is applied on plastic lens substrates to improve abrasion resistance, then abrasion resistance is enhanced, but adhesion between the substrate and cured film remains insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the coating material by incorporating carboxylic amide compounds with specific molecular structures (formulae 1 and 2) that can form hydrogen bonds with the polythiourethane substrate, thereby improving adhesion while maintaining abrasion resistance
Solution Approach 2:
The invention uses a composite coating system combining carboxylic amide compounds with silane coupling agents and other functional materials to create a multi-functional cured film that simultaneously achieves strong adhesion, high abrasion resistance, and optical transparency
2Duration of action of stationary object
If a hard coat is coated and cured on plastic lens substrates to enhance durability, then abrasion resistance improves, but sufficient adhesion is not achieved
Solution Approach 1:
The carboxylic amide compound acts as a chemical intermediary between the polythiourethane substrate and the cured film, forming hydrogen bond bridges that strongly connect the two layers and prevent delamination while maintaining long-term durability
Solution Approach 2:
The invention modifies the chemical parameters of the coating by using carboxylic amide compounds with specific functional groups that can form multiple hydrogen bonds, thereby enhancing both adhesion and long-term durability of the hard coat
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 plastic lens with improved abrasion resistance, transparency, and adhesion to the cured film, ensuring excellent optical performance and durability.
Implementation Method 1
-H and -O in the carboxylic amide bond (carbonyldiimino structure) present on the surface of the lens form hydrogen bonds with -O and -H in the composition forming a hard coat to enhance the adhesion
Data Source
AI summary
A plastic lens is provided which is excellent in abrasion resistance, transparency and appearance, and the plastic lens contains, as a substrate, a lens containing a resin having an NHCO structure and a resin containing a specific monomer, and a cured film having an NHCO structure formed by reacting a coating composition directly on the substrate, the coating composition containing a component (i) that is at least one selected from a specific organosilicon compound and a hydrolysate thereof, a component (ii) that is at least one selected from an amino group-containing organic compound, a hydroxyl group-containing organic compound, a mercapto group-containing organic compound, an amino group-containing organosilicon compound, a hydroxyl group-containing organosilicon compound and a mercapto group-containing organosilicon compound, and a component (iii) that is at least one selected from an isocyanate group-containing organic compound and an isocyanate group-containing organosilicon compound.