Pearlescent Contact Lens Color Fixing for Stable Pattern Adhesion
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Solution Overview
Problem
The existing methods for preparing pigments in contact lenses face stability and safety issues, affecting the shiny and discolored appearance effects, which are important for wearer comfort and aesthetics.
Innovation Solution
A color fixing combination comprising a pearlescent powder and an adjuvant, where the adjuvant includes solvents, thickeners, hydrophilic polymers, and dispersants, is used to stabilize the pearlescent powder on the lens, ensuring safety and maintaining the desired patterns and colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pigments are used to create shiny and discolored appearance effects in contact lenses, then aesthetic appearance is improved, but pigment stability and safety issues worsen
Solution Approach 1:
The patent introduces an adjuvant as an intermediary substance between the pearlescent powder and the contact lens material. This adjuvant comprises multiple components including solvents, thickeners, hydrophilic polymers, and dispersants that work together to stabilize the pearlescent powder, ensure its safety, and maintain its aesthetic effects while preventing direct contact between potential irritants and the lens material.
Solution Approach 2:
The patent creates a composite color fixing combination consisting of pearlescent powder (5-40 wt%) and adjuvant (60-95 wt%). This composite formulation integrates multiple functional components that collectively provide both the desired aesthetic appearance and the necessary stability and safety properties, resolving the contradiction between appearance enhancement and material reliability.
2Illumination intensity
If pearlescent powder is added to contact lens to achieve shiny effects, then aesthetic appearance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the pearlescent powder with multiple adjuvant components into a single integrated color fixing combination formulation. This merging approach simplifies the manufacturing process by allowing all components to be mixed and applied together in one step, rather than requiring separate processing steps for each component, thus reducing manufacturing complexity while maintaining aesthetic effects.
3Illumination intensity
If color powders are used to create patterns on contact lens, then aesthetic appearance is improved, but color stability and resistance to fading worsen
Solution Approach 1:
The adjuvant serves as a protective intermediary that stabilizes the color powders and prevents fading. The hydrophilic polymers and dispersants in the adjuvant form a stable matrix that locks in the color pigments, while the solvent system ensures uniform distribution and bonding, thereby maintaining color stability and resistance to fading throughout the wear period.
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 stable and safe method for achieving shiny and colored effects in contact lenses, enhancing wearer comfort and aesthetics while preventing color fading and cytotoxicity, ensuring the pearlescent powder adheres well to the lens surface.
Implementation Method 1
The adjuvant comprises at least two of: alcohols, amines, ketones, alkenes, esters, resins, polyamides, celluloses, polyacids, ammonium salts, phosphoric acids, alkene acids, or silanes
Implementation Method 2
The dispersant comprising polyacids, ammonium salts, phosphoric acids, alkene acids, silanes, or a combination thereof
Data Source
Figure 1
AI summary
A color fixing combination for contact lens with pearlescent is provided, including a pearlescent powder and an adjuvant. The adjuvant includes at least two of the following: alcohols, amines, ketones, alkenes, esters, resins, polyamides, celluloses, polyacids, ammonium salts, phosphoric acids, alkene acids, or silanes, so that the pearlescent powder stably adheres to the lens to form a pattern layer.