Coating Agent Composition for Plastic Lenses
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Solution Overview
Problem
Conventional coating agents for plastic lenses fail to form hard coatings efficiently at low temperatures and short curing times, leading to deformation and color tone changes, especially when applied to lenses with coloring matter such as photochromic compounds.
Innovation Solution
A coating agent composition comprising fine inorganic oxide particles, a polymerizable alkoxysilane compound, an acetylacetonato complex as polymerizing catalyst, and a β-dicarbonyl compound as catalyst stabilizer, within specific mass ratios, allowing for curing at 100° C. to 110° C. for 1 to 2 hours while maintaining color tone stability and improving light resistance and weather-proof properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating agents are used with standard curing conditions (120°C for 3 hours), then sufficient coating properties are achieved, but productivity is reduced and lens deformation occurs
Solution Approach 1:
The patent modifies the chemical parameters of the coating system by selecting specific organosilane compounds with particular functional groups and adjusting their concentration ratios, along with choosing specific catalysts and stabilizers, to enable the coating to cure at lower temperatures (100-110°C) and shorter times (1-2 hours) while maintaining adequate film properties
Solution Approach 2:
The patent creates a composite coating system combining organosilane compounds, inorganic oxide particles, catalysts, and stabilizers in specific proportions to achieve both low-temperature curability and sufficient mechanical properties, forming a composite material that balances curing efficiency and coating performance
2Strength
If conventional coating agents are applied to lenses with coloring matter, then hard coating is formed, but color tone changes occur
Solution Approach 1:
The patent adjusts the chemical composition parameters by incorporating catalyst stabilizers and selecting specific organosilane compounds that minimize thermal and chemical interactions with coloring matter, thereby preventing color tone changes while still achieving adequate hard coating formation
Solution Approach 2:
The patent introduces catalyst stabilizers and specific functional group compounds as intermediaries that mediate between the curing process and the coloring matter, protecting the color tone from degradation while allowing the hard coating to form through controlled chemical reactions
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 enables the formation of hard coatings with excellent abrasion resistance, adhesiveness, and preservation stability, preventing color tone changes and enhancing light resistance and weather-proof properties of photochromic lenses, thus increasing productivity and maintaining desired properties.
Implementation Method 1
a polymerizable alkoxysilane compound, an acetylacetonato complex as polymerizing catalyst
Implementation Method 2
an acid aqueous solution
Data Source
AI summary
A coating agent composition obtained by mixing fine inorganic oxide particles, a polymerizable alkoxysilane compound, a polymerizing catalyst, an acid aqueous solution and an organic solvent, and satisfying the following conditions (1) to (3):(1) the polymerizing catalyst is at least partly an acetylacetonato complex;(2) a β-dicarbonyl compound (excluding acetylacetonato complex) having two carbonyl groups in the molecule via a carbon atom, is further contained as a catalyst stabilizer; and(3) the fine inorganic oxide particles and the alkoxysilane compound are contained in a total amount of 23 to 40% by mass.The coating agent composition is capable of forming a cured film having excellent properties such as abrasion resistance on the surfaces of plastic ophthalmic lens through the curing conducted at a low temperature for a short period of time, and does not affect the color tone of the lens material even when it is directly applied to the surfaces of the plastic lens material that contains a coloring matter, such as sunglass lenses.