Low-Viscosity Cosmetic Preparation for Eyelid Coloring
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Solution Overview
Problem
Existing cosmetic preparations for coloring eyelids and eyebrows face challenges in achieving uniform application, high covering power, durability, and easy removability due to issues with viscosity, penetration, and bleeding into skin folds, which are difficult to address with traditional methods and formulations.
Innovation Solution
An aqueous preparation with a Brookfield viscosity of less than 50 mPa-sec, containing 30-50 wt.% acrylate polymer solids, ethanol or propanol, moisture-retention agents, polyoxyethylene glycerin fatty acid ester, and polyether-modified polysiloxane, allowing for capillary application without bleeding and ensuring easy drying and removability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the viscosity of the preparation is reduced to enable convenient removal from the reservoir with a capillary instrument, then ease of operation is improved, but the preparation tends to penetrate into the skin and become difficult to remove
Solution Approach 1:
The patent changes the viscosity parameter to less than 50 mPa·sec to enable easy flow through capillary instruments, while simultaneously adjusting the chemical composition (adding specific polymers and surfactants) to prevent skin penetration and maintain durability despite the low viscosity
Solution Approach 2:
The patent creates a composite formulation combining low-viscosity base liquids with specific polymers (polyacrylate, polyvinyl alcohol), surfactants, and film-forming agents that work together to provide both easy application and resistance to skin penetration, achieving a synergistic effect
2Ease of operation
If the viscosity of the preparation is reduced for capillary application, then ease of operation is improved, but the preparation accumulates in skin folds and pockets, causing irregular and sloppy appearance
Solution Approach 1:
The patent adjusts the viscosity parameter and adds specific surfactants and film-forming polymers that modify the preparation's behavior on skin, preventing accumulation in folds while maintaining smooth flow during application
Solution Approach 2:
The patent introduces film-forming substances and surfactants as intermediary components that mediate between the low-viscosity base formulation and the skin surface, creating a controlled interaction that prevents bleeding into folds while allowing smooth application
3Quantity of substance
If highly viscous preparations are used with stiff brushes, then covering power is improved, but accuracy of application deteriorates
Solution Approach 1:
The patent fundamentally changes the viscosity parameter from high to low (less than 50 mPa·sec), enabling precise control with capillary instruments while maintaining adequate covering power through optimized formulation composition rather than relying on viscosity alone
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 enables precise, non-bleeding application with uniform edges, reduced smudging, and extended storage stability of the applicator, while maintaining effective coloration and ease of removal with the combination of acrylate copolymer particles, alcohols, and moisture-retention agents.
Implementation Method 1
The preparation does not 'bleed' into skin folds and skin pockets. This non-bleeding property is attributable to the acrylate copolymer particles and the alcohols (ethanol and/or propanol).
Implementation Method 2
The alcohols (ethanol, propanol) also have a certain embrittling and stiffening effect as a result of their tendency to withdraw moisture and fats from the skin
Implementation Method 3
The preparation dries readily on the skin, which reduces the risk of smudging during application
Implementation Method 4
One property of these materials is that they counteract the increase in viscosity brought about (e.g.) by the plastic dispersion. In this connection, it was surprising that the preparation, particularly a preparation containing both of the substances, nonetheless had a low tendency to flow into skin folds.
Data Source
AI summary
An aqueous cosmetic preparation for coloring of eyelids and eyebrows contains 3-35 wt. % of an aqueous plastic dispersion based on an acrylate polymer and having a 30-50% solids content, 1-20 wt. % of at least one alcohol being ethanol and/or propanol, 2-25 wt. % of at least one moisture-retention agent, 0.2-5 wt. % of a polyoxyethylene glycerin fatty acid ester and/or a polyether-modified polysiloxane, and a colorant. The preparation has a Brookfield viscosity at 25° C. of less than 50 mPa-sec.