Nail Varnish Oligomer Segmentation for Shine and Removal
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Solution Overview
Problem
Current nail polishes face challenges such as poor shine retention and low resistance to wear in solvent-based varnishes, and difficult removal and potential nail trauma with gel varnishes, along with the drawbacks of crosslinking agents and UV lamp requirements.
Innovation Solution
A nail varnish composition using oligomers with a molar mass greater than 1500 g/mol and a glass transition temperature above 25°C, which can physically dry without a UV lamp, combined with a top-coat containing a photo-initiator for crosslinking in visible light, to achieve improved shine retention and wear resistance while maintaining easy application and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If gel varnish is used to improve resistance and duration on the nail, then the varnish remains on the nail for at least two weeks, but the makeup removal becomes much more difficult and traumatic requiring prolonged contact with acetone-based remover
Solution Approach 1:
The invention divides the nail varnish system into two separate components: a base varnish containing oligomers that provide physical drying and adhesion, and a separate top coat containing photoinitiators and crosslinking agents that provide enhanced durability. This segmentation allows the base layer to be easily removable while the top layer provides protective durability, resolving the contradiction between long duration and easy removal.
Solution Approach 2:
The invention applies different functional properties to different layers of the nail varnish system. The base varnish layer has properties optimized for adhesion and ease of removal (using high molecular weight oligomers), while the top coat layer has properties optimized for durability and resistance (using crosslinking agents). This local differentiation of properties allows each layer to excel at its specific function without compromising the other.
2Ease of operation
If photo-initiators are added to enable crosslinking without UV lamp, then the varnish can be applied without specialized equipment, but the photo-initiators are sensitizing, allergenic and sometimes toxic substances that come into contact with the nail
Solution Approach 1:
The invention separates the photoinitiators and crosslinking agents into a distinct top coat layer that is applied after the base varnish. This segmentation ensures that the harmful photo-initiators are not in direct contact with the nail during application, as they are contained in the top coat layer that sits above the base layer. The base layer provides the primary adhesion and physical drying function without containing sensitizing substances.
Solution Approach 2:
The base varnish layer acts as an intermediary barrier between the nail and the photo-initiators in the top coat. This intermediate layer provides physical separation, preventing direct contact between the nail and the potentially harmful crosslinking agents while still allowing the top coat to perform its crosslinking function for enhanced durability.
3Ease of operation
If solvent-based varnish is used for easy application and removal, then the makeup removal is simple with cotton pad and solvent, but the shine retention is poor and decreases after four days on average
Solution Approach 1:
The invention creates a composite nail varnish system combining two different material systems: a base varnish made from high molecular weight oligomers (average molecular weight >1500 g/mol) that provides physical drying and adhesion properties, and a top coat containing crosslinking agents and photoinitiators that provide enhanced durability and shine retention through chemical crosslinking. This composite structure allows the system to exhibit properties of both components: easy application and initial adhesion from the oligomer base, plus extended shine retention and durability from the crosslinked top layer.
Solution Approach 2:
The invention merges the advantages of both solvent-based and gel varnishes into a single integrated system. The base varnish provides the easy application and physical drying characteristics of solvent-based products, while the crosslinked top coat provides the enhanced shine retention and durability of gel varnishes. The combination allows the final system to deliver both ease of use and long-lasting 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 varnish composition provides extended shine retention and wear resistance comparable to gel varnishes, with easy application and removal like solvent-based varnishes, and avoids the use of sensitizing or toxic crosslinking agents.
Implementation Method 1
said oligomer having acrylic or methacrylic double bonds available to react with radicals
Implementation Method 2
a top-coat containing a photo-initiator for crosslinking in visible light
Implementation Method 3
Drying by evaporation of the solvent leads in a few minutes to the creation of a film
Data Source
AI summary
The invention relates to a nail polish composition containing at least one film-forming agent, a plasticizer, and a solvent. Said composition is characterized in that it also includes one or more oligomer(s) having a molar mass of 1500 g/mol and/or a glass transition temperature Tg greater than 25°C. Said oligomer has dual acrylic or methacrylic bonds available for reacting with groups without containing any agent for cross-linking the oligomer, such as a photoinitiator. The method for applying the nail polish includes consecutively applying such a photoinitiator-free composition and a similar photoinitiator-containing composition followed by visible-light cross-linking. The nail polish has longer-lasting sheen and better hardness than solvent-based nail polishes and also comes on and off much more quickly than a gel-based nail polish.