Water Based Liquid Makeup Cosmetic Formulation
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Solution Overview
Problem
Water-based liquid eye makeup cosmetics with tabular pigments face issues of settling, poor water-resistant fixing performance, and difficulty in redispersibility, making it hard to draw fine lines and maintain line integrity over time.
Innovation Solution
A water-based liquid makeup cosmetic formulation with a viscosity of 50 to 250 mPa·s, containing tabular pigments like mica and spherical powders, a pigment dispersant, and a coating film-forming agent, along with a surfactant, which includes a spherical powder and a homopolymer or copolymer, ensuring improved dispersibility and water-resistant performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tabular pigment with large particle diameter is blended to achieve fine line drawing capability, then line fineness is improved, but the pigment settles down quickly forming hard cake and water resistant fixing performance deteriorates
Solution Approach 1:
The patent introduces a specific dispersant system comprising polyethylene glycol fatty acid ester and hydrogenated lecithin as intermediary substances. These dispersants act as mediators between the tabular pigment particles and the liquid medium, providing steric hindrance and electrostatic repulsion that prevents pigment aggregation and settling, thereby maintaining line fineness while preventing hard cake formation
Solution Approach 2:
The patent optimizes the viscosity parameter of the liquid cosmetic to a specific range (50-250 mPa·s) and controls the particle diameter of tabular pigment within 5-50 μm. By adjusting these physical parameters, the formulation achieves a balance where pigment particles remain suspended long enough for fine line drawing while maintaining adequate water resistant fixing performance
2Reliability
If tabular pigment is blended to achieve water resistant fixing performance, then fixing performance is improved, but the pigment settles down with passage of time forming hard cake
Solution Approach 1:
The dispersant system (polyethylene glycol fatty acid ester and hydrogenated lecithin) serves as a protective intermediary layer around tabular pigment particles during storage. This intermediary layer prevents direct contact between pigment particles and causes long-term settling, thereby maintaining both water resistant fixing performance and storage stability
Solution Approach 2:
The patent creates a composite formulation combining tabular pigment, specific dispersants, coating film-forming agents, and surfactants. This composite material system synergistically prevents pigment settling while maintaining water resistant fixing performance throughout the product shelf life
3Reliability
If viscosity is increased to improve water resistant fixing performance, then fixing performance is improved, but the cosmetic becomes difficult to apply and fine lines cannot be drawn
Solution Approach 1:
The patent precisely controls the viscosity parameter within the range of 50-250 mPa·s, which is low enough to allow smooth application and fine line drawing while high enough to provide adequate water resistant fixing performance. This parameter optimization resolves the contradiction between ease of operation and fixing 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 cosmetic effectively prevents quick settling of tabular pigments, allows for easy redispersement by slight shaking, and maintains excellent water-resistant fixing performance, enabling fine line drawing and improved coating properties.
Implementation Method 1
a water based liquid makeup cosmetic having a viscosity of 50 to 250 mPa·s and containing at least a tabular pigment, a pigment dispersant, a coating film-forming agent
Implementation Method 2
improved dispersibility and water-resistant performance
Implementation Method 3
0.001 to 0.5 mass % of a surfactant
Implementation Method 4
a coating film-forming agent... excellent in a water resistant fixing performance
Data Source
AI summary
Provided is a water based liquid makeup cosmetic which is filled in an applicator for a liquid cosmetic equipped with a brush-like coating part to be suitably used for making up, particularly a water based liquid makeup cosmetic which is suited for making up around eyes, and in order to obtain the cosmetic, assumed is a formation comprising at least a tabular pigment, a pigment dispersant, a coating film-forming agent, 0.001 to 0.5 mass % of a surfactant and water and further comprising a spherical powder.According to the formation for a water based liquid makeup cosmetic, obtained is a water based liquid makeup cosmetic which makes it easy to rehomogenize (redisperse) the cosmetic by slightly shaking even after turned into an uneven state with standing still during storage and which makes fine lines liable to be drawn and is excellent in a water resistant fixing performance.