Antistatic Primer Composition for Optical Articles
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Solution Overview
Problem
Existing antistatic primer compositions for optical articles, such as ophthalmic lenses, face challenges with crystallization risks, reduced mechanical properties, and inadequate adhesion to substrates, particularly with PEO/Li systems, which affect transparency and scratch resistance.
Innovation Solution
A curable antistatic primer composition incorporating a polyalkylene oxide polymer, a Lithium salt, and an amorphizer such as a dendritic polymer, which prevents crystallization and enhances electrical conductivity while maintaining transparency and adhesion, allowing for the formation of antistatic coatings with improved mechanical properties and low haze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PEO/Li system is used to provide antistatic properties, then electrical conductivity is improved, but crystallization occurs which reduces transparency and mechanical properties
Solution Approach 1:
The patent introduces a crown ether compound as an intermediary substance between the PEO polymer and Li salt. This crown ether acts as a mediator that complexes with lithium ions, preventing the formation of crystalline structures while maintaining electrical conductivity. The crown ether's specific molecular structure allows it to coordinate with Li+ ions, disrupting the regular crystalline packing that would otherwise occur in PEO/Li systems.
Solution Approach 2:
The patent changes the molecular and structural parameters of the system by incorporating crown ether compounds with specific molecular weights and structures. This parameter change transforms the system from a crystalline PEO/Li structure to an amorphous complex, fundamentally altering the physical state and properties of the material while maintaining its antistatic functionality.
2Adaptability or versatility
If additional coatings are applied to the optical article, then functional properties are improved, but the impact strength is reduced and the system becomes more brittle
Solution Approach 1:
The patent applies a primer layer beforehand, before depositing the hard abrasion-resistant coating. This primer layer serves as a cushioning intermediate layer that absorbs stress and prevents the rigid coating system from becoming too brittle. The primer provides a transition zone between the substrate and the hard coating, maintaining impact strength while allowing the functional coating to provide its protective properties.
3Strength
If a hard abrasion-resistant coating is applied to protect the lens surface, then scratch resistance is improved, but the coating can be scratched when hard dust particles are rubbed on the surface
Solution Approach 1:
The patent introduces an electroconductive layer as an intermediary between the hard coating and the external environment. This intermediate layer provides antistatic properties that prevent dust particle accumulation, thereby protecting the hard coating from being scratched by rubbed particles. The electroconductive layer acts as a protective mediator that eliminates the harmful effect of static charge without compromising the scratch resistance of the hard coating.
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 antistatic properties with rapid charge decay, high transmittance, low haze, and enhanced mechanical performance, including scratch resistance, on various substrates, while allowing additional coatings to be applied without compromising optical or mechanical properties.
Implementation Method 1
The materials inducing the strongest mobility are the so called conducting materials. Thus, a high-conductivity material makes it possible to more rapidly dissipate the charges.
Implementation Method 2
the curable antistatic primer composition comprises: (a) at least one polyalkylene oxide polymer; (b) at least a Lithium salt; (c) at least an amorphizer selected from at least a dendritic polymer
Data Source
AI summary
The present invention relates to a curable antistatic primer composition, comprising: (d) at least one polyalkylene oxide polymer; (e) at least a Lithium salt; (f) at least an amorphizer selected from at least a dendritic polymer. The present invention also relates to an optical article having at least one surface comprising an antistatic primer coating obtained by depositing on a substrate and curing said composition, and its production method.