Anti-fouling Coating Adhesion via Partial Polymerization
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Solution Overview
Problem
Existing methods face challenges in achieving good adhesion between hard coatings and anti-fouling coatings on optical articles, such as ophthalmic lenses, which affects the durability and performance of the anti-fouling properties.
Innovation Solution
A process involving partial polymerization of hard coating compositions using cationic polymerization initiators, followed by deposition of an anti-fouling top coat and simultaneous curing, which reduces the penetration of the top coat into the hard coat and enhances adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the hard coating composition is fully cured before depositing the anti-fouling top coat, then the hard coat provides good abrasion resistance and hardness, but the adhesion between the hard coat and anti-fouling coating deteriorates
Solution Approach 1:
The hard coating is preliminarily cured (partially polymerized) before depositing the anti-fouling top coat, creating a surface that provides good adhesion while maintaining the protective properties of the hard coat
Solution Approach 2:
The degree of polymerization of the hard coating is controlled to be between 10-90% (preferably 30-70%) before top coat deposition, optimizing both adhesion and surface properties
2Ease of manufacture
If the anti-fouling top coat is deposited on a fully cured hard coat, then the manufacturing process is simplified, but the top coat penetrates deeply into the hard coat causing loss of surface properties
Solution Approach 1:
The hard coating is preliminarily cured to a specific degree before top coat deposition, preventing excessive penetration while maintaining manufacturing efficiency
Solution Approach 2:
The polymerization degree is controlled to optimize the balance between process simplicity and preservation of top coat surface properties
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
This process ensures a strong adhesion between the hard coat and anti-fouling top coat, preserving the surface properties and improving the durability and effectiveness of the anti-fouling layer.
Implementation Method 1
a hard coating composition which is polymerizable by cationic polymerization
Implementation Method 2
submitting the article resulting from the preceding step to a heating step so as to completely cure the hard coating composition and the anti-fouling top coat composition
Data Source
AI summary
Process for obtaining a hard coated article having anti-fouling properties, including, for example, an optical article such as an ophthalmic lens, comprising a substrate coated with a hard coating providing abrasion resistance and hardness and adhesion to the anti-fouling coating, and the article obtained from such process.