Photocurable Artificial Nail Composition for Low-Heat Curing
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Solution Overview
Problem
Gel nails cause heat pain during curing due to high-illuminance visible light LED use, and yellowing issues occur due to photopolymerization initiators, affecting aesthetic appearance.
Innovation Solution
A photocurable artificial nail composition using a photopolymerization initiator without α-hydroxyalkylphenone and without peroxide thermal polymerization initiators, combined with specific polymerizable compounds, to suppress heat pain and yellowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-illuminance visible light LED is used for curing, then curing time is shortened and treatment efficiency is improved, but heat pain felt by the subject increases due to polymerization heat
Solution Approach 1:
The patent changes the chemical composition parameters of the photocurable artificial nail composition by incorporating specific components (polyfunctional thiol compound, chain transfer agent, and regulated photopolymerization initiator) to control the polymerization reaction characteristics. This modifies the heat generation parameters during curing, reducing polymerization heat while maintaining curing speed, thus resolving the contradiction between productivity improvement and heat pain reduction
Solution Approach 2:
The patent introduces a chain transfer agent as an intermediary substance that mediates the polymerization reaction. This intermediary controls the reaction kinetics and heat release profile, allowing the system to maintain efficient curing while reducing the harmful heat pain effect on the subject
2Reliability
If photopolymerization initiator is used for curing, then curing function is achieved, but yellowing occurs during curing affecting aesthetic appearance
Solution Approach 1:
The patent extracts and eliminates the harmful yellowing effect by carefully selecting and regulating the photopolymerization initiator type and quantity, and by incorporating components that counteract yellowing. This removes the adverse aesthetic effect while preserving the essential curing function
Solution Approach 2:
The patent creates a composite photocurable composition combining multiple components (polymerizable compound, oligomer, polyfunctional thiol compound, photopolymerization initiator, chain transfer agent) that work synergistically. This composite formulation achieves effective curing while suppressing yellowing through the combined effects of the components
3Adaptability or versatility
If coating film thickness is increased for three-dimensional art or large application amount, then aesthetic design capability is improved, but heat pain increases due to thicker coating
Solution Approach 1:
The patent changes the rheological and reaction parameters of the composition by incorporating oligomers and controlling viscosity, enabling the application of thicker coating films. Simultaneously, the polyfunctional thiol compound and chain transfer agent regulate the polymerization heat generation, allowing thick applications for three-dimensional art without excessive heat pain
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 effectively reduces heat pain and yellowing, ensuring color tone stability and improved curing properties.
Implementation Method 1
The gel nails are photocurable artificial nail compositions that are applied onto a nail using a brush or the like to coat the nail, and cured with ultraviolet rays or visible rays
Data Source
AI summary
It is an object of the present invention to provide a photocurable artificial nail composition that suppresses heat pain during curing, suppresses yellowing (including yellowing before curing), and has color tone stability. The photocurable artificial nail composition of the present invention includes a photopolymerization initiator and a polymerizable compound, in which the photopolymerization initiator contains a compound represented by General Formula (1), provided that the photopolymerization initiator does not contain an α-hydroxyalkylphenone photopolymerization initiator, and the composition does not contain a peroxide thermal polymerization initiator,wherein R represents a hydrocarbon group having 1 to 5 carbon atoms.