Polythiol Photocurable Nail Composition for Low-Heat, Glossy Curing
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Solution Overview
Problem
Gel nails containing polythiol compounds face issues with heat generation during photocuring, reduced storage stability, and difficulty in maintaining surface gloss, which are not adequately addressed by existing solutions.
Innovation Solution
A photocurable composition comprising components (A) to (D), including a urethane-modified (meth)acrylate oligomer, (meth)acrylate, polythiol compound, and photoinitiator, with specific ratios and additives to enhance storage stability and photocurability while suppressing heat generation and ensuring high gloss on the cured surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polythiol compound is added to enhance photocurability and surface curability, then photocurability is improved, but heat generation increases during photocuring
Solution Approach 1:
The patent changes the molecular weight parameter of the polythiol compound to a specific range (500-2000) and adjusts the functional group ratio (thiol group to (meth)acryloyl group ratio of 0.05-0.5) to optimize the balance between photocurability and heat generation. This parameter optimization allows sufficient photocuring performance while reducing excessive heat production during the curing process.
Solution Approach 2:
The patent creates a composite photocurable composition combining multiple components: (meth)acrylate compound, polythiol compound, and photoinitiator. This composite formulation synergistically balances photocurability enhancement with heat generation control, where each component contributes specific properties that collectively resolve the contradiction between high reactivity and heat management.
2Reliability
If a polythiol compound is added to enhance photocurability, then surface curability is improved, but storage stability decreases due to increased viscosity
Solution Approach 1:
The patent optimizes the molecular weight of the polythiol compound (500-2000) and controls the concentration ratio of thiol groups to (meth)acryloyl groups (0.05-0.5) to maintain appropriate viscosity for storage stability while ensuring sufficient surface curability. This parameter control prevents excessive thickening that would compromise storage stability.
Solution Approach 2:
The patent applies different functional components with specific properties to different aspects of the composition: the polythiol compound provides surface curability enhancement locally at the surface interface, while the overall composition formulation maintains bulk storage stability through controlled molecular weight and concentration ratios.
3Stability of the object's composition
If a polymerization inhibitor is added to enhance storage stability, then storage stability is improved, but gloss of the cured product surface is affected
Solution Approach 1:
The patent extracts or eliminates the need for polymerization inhibitors by using a carefully formulated composition of (meth)acrylate compound and polythiol compound with controlled ratios. This extraction approach maintains storage stability through compositional balance rather than chemical inhibition, thereby preserving surface gloss without compromise.
Solution Approach 2:
The patent uses the specific ratio relationship between polythiol compound and (meth)acrylate compound as an intermediary mechanism to achieve storage stability. This compositional balance acts as a natural stabilizer that does not interfere with the curing process or surface gloss, replacing the need for traditional polymerization inhibitors.
4Reliability
If the concentration of polythiol compound is increased to improve photocurability, then photocurability is enhanced, but the composition becomes more viscous and harder to handle
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polythiol compound (500-2000) and controls the functional group ratio (thiol to (meth)acryloyl of 0.05-0.5) to achieve sufficient photocurability while maintaining manageable viscosity. This parameter optimization ensures the composition remains easy to apply and handle while providing enhanced photocuring performance.
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 reduced heat generation, improved storage stability, and maintains high gloss on the cured surface, balancing photocurability and durability.
Implementation Method 1
a photocurable composition for a nail or an artificial nail, the composition comprising components (A) to (D)... component (D) a photoinitiator
Implementation Method 2
it is known that a polythiol compound is added to a compound having a (meth)acryloyl group, thereby allowing a gel nail to be enhanced in photocurability
Data Source
AI summary
To provide a photocurable composition for a nail or an artificial nail, which is suppressed in heat generation and also satisfies both storage stability and photocurability and which allows gloss to be expressed on a surface of a cured product. A photocurable composition for a nail or an artificial nail, the composition comprising components (A) to (D), and the composition comprising 30 to 70 parts by mass of the component (B) and 10 to 80 parts by mass of the component (C) based on 100 parts by mass of the component (A): component (A): a urethane-modified (meth)acrylate oligomer having a weight average molecular weight of 3000 to 6000 and containing 3 to 5 (meth)acryloyl groups per molecule; component (B): a (meth)acrylate containing one or more (meth)acryloyl groups per molecule (except for the component (A)); component (C): a polythiol compound; and component (D): a photoinitiator.