Transparent Antistatic Coating via Composite Conductive Polymer
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Solution Overview
Problem
Current antistatic coatings for optical articles, such as ophthalmic lenses, face challenges in maintaining optical transparency while providing adequate antistatic and abrasion-resistant properties, often requiring high amounts of conductive polymers which can lead to optical transmission loss and environmental stability issues.
Innovation Solution
A curable composition comprising a conductive polymer, a binder, and a specific organic compound of the formula R'-O-[CH2-CHR'-O]-R2, where R1 and R2 are alkyl groups, and R' is H, is used to create a transparent, antistatic coating with improved conductivity and abrasion resistance, even when used in low concentrations of conductive polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of conductive polymers are used to achieve adequate antistatic properties, then antistatic performance is improved, but optical transmission loss increases and environmental stability deteriorates
Solution Approach 1:
The patent uses a composite material system combining conductive polymer particles (for antistatic properties) with a polymer matrix (for mechanical support and optical clarity). This allows the conductive polymer to be dispersed in low concentrations throughout the matrix, achieving adequate antistatic performance without the optical transmission loss that would result from high concentrations of conductive polymer alone.
Solution Approach 2:
The conductive polymer is distributed as discrete particles throughout the polymer matrix rather than forming a continuous high-concentration layer. This local distribution strategy provides antistatic functionality at specific points while maintaining overall optical transparency, as the dispersed particles do not aggregate to block light transmission.
2Reliability
If high amounts of conductive polymers are used to achieve adequate antistatic properties, then antistatic performance is improved, but environmental stability deteriorates
Solution Approach 1:
The polymer matrix acts as a protective medium that stabilizes the conductive polymer particles against environmental degradation. This composite structure shields the conductive polymer from moisture, oxygen, and other environmental factors that would otherwise cause deterioration, thereby improving environmental stability while maintaining antistatic performance.
Solution Approach 2:
The polymer matrix provides preemptive protection to the conductive polymer particles by enclosing them within a stable, protective environment. This prior cushioning effect prevents environmental damage before it can occur, extending the service life and stability of the antistatic coating.
3Reliability
If conventional antistatic coatings are applied to optical articles, then antistatic properties are achieved, but abrasion resistance is insufficient
Solution Approach 1:
The patent creates a composite coating where the polymer matrix provides mechanical strength and abrasion resistance, while the dispersed conductive polymer particles provide antistatic properties. This composite structure allows both functions to be achieved simultaneously, overcoming the limitation of conventional antistatic coatings that lack sufficient abrasion resistance.
Solution Approach 2:
The polymer matrix serves multiple functions: it provides mechanical support, abrasion resistance, and optical clarity, while also serving as a vehicle to distribute and protect the conductive polymer particles. This multi-functionality allows a single coating layer to achieve both antistatic properties and durability.
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 achieves high optical transparency with low haze values and excellent antistatic and abrasion-resistant properties, allowing for the use of lower conductive polymer amounts, thus overcoming the limitations of existing coatings in maintaining optical clarity and mechanical durability.
Implementation Method 1
a material having a high conductivity allows dissipating more rapidly charges
Implementation Method 2
improving the antistatic properties of a coating formed from a curable composition comprising at least one conductive polymer... by adding a specific organic compound
Data Source
Figure 1
AI summary
The present invention relates to a curable composition, providing, upon curing, a transparent, antistatic coating, comprising at least one conductive polymer, at least one binder, at least one solvent, and at least one compound of formula R1-O-[(CH2-CHR')-O]n-R2, wherein R1 and R2 independently represent an alkyl group, R' is H or methyl and n is an integer ranging from 2 to 225. Said coating exhibits superior abrasion resistance properties when the binder is an epoxysilane, preferably an epoxyalkoxysilane. The invention further relates to optical articles comprising a substrate at least partially coated with a transparent antistatic coating formed by depositing onto the substrate and curing the above curable composition. The obtained optical articles exhibit antistatic properties, high optical transparency with about 91-92% of transmittance, low haze and improved abrasion resistance.