Electrostatically Sprayable Cosmetic Formulation for Uniform Skin Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sunscreen formulations face challenges in achieving uniform coverage and sufficient protection due to poor electrostatic sprayability, often resulting in streaking and inadequate UV protection, despite containing emollients and skin care additives that hinder electrostatic charging.
Innovation Solution
The formulation combines ethanol, liquid polar emollients, polyalkyleneoxy terminated polyamide, acrylate film forming agents, and high amounts of UV filters and moisture agents, ensuring a specific electrical resistance and surface tension for uniform electrostatic spraying, eliminating the need for thickening agents and enhancing skin hydration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional sunscreen formulations contain emollients and skin care additives, then skin caring effect is improved, but electrostatic sprayability deteriorates
Solution Approach 1:
The patent modifies the electrical parameters of the formulation by controlling specific electrical resistance (10-1000 GOhm·mm2/m) and permittivity (2.0-25.0) to enable electrostatic spraying while retaining emollients and skin care additives. This parameter optimization allows the formulation to be electrostatically sprayable despite containing ingredients that traditionally hinder sprayability.
Solution Approach 2:
The patent creates a composite formulation system that integrates UV filters, emollients, skin care additives, and electrostatic charging agents in specific combinations. This composite approach allows the formulation to simultaneously achieve electrostatic sprayability, skin protection, and skin caring effects that individual components cannot provide alone.
2Quantity of substance
If pump sprays or pre-pressurized aerosol containers are used to apply sunscreen, then sufficient amount of formulation is applied, but uniform coverage is not achieved
Solution Approach 1:
The patent replaces mechanical spray systems (pump sprays, aerosols) with an electrostatic spraying system. The electrostatic charging device imparts electrical charge to droplets, enabling them to be attracted to and distributed evenly across the skin surface. This substitution of mechanical force with electrostatic force achieves both sufficient application quantity and uniform coverage.
3Ease of operation
If conventional aerosol sprays use propellant gas, then formulation is atomized and sprayed, but environmental harm and health hazards occur
Solution Approach 1:
The patent removes propellant gas from the formulation system entirely. Instead of using compressed gas for atomization, the formulation is sprayed using electrostatic charging and electrical field forces. This extraction of the harmful propellant component eliminates environmental and health hazards while maintaining effective spray atomization through alternative electrostatic mechanisms.
4Manufacturing precision
If electrostatic spraying is used to apply cosmetic formulation, then constant and uniform flow is achieved, but formulations with high surface tension and viscosity are not sprayable
Solution Approach 1:
The patent optimizes the formulation's electrical parameters (specific electrical resistance and permittivity) to enable electrostatic spraying. By controlling these electrical properties along with surface tension and viscosity, the formulation achieves sprayability while maintaining constant and uniform flow characteristics during electrostatic application.
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
This approach results in a nearly 100% skin coverage with improved sun protection and hydration, maintaining the electrostatic sprayability and water resistance comparable to prior art, while increasing the sun protection factor (SPF) without increasing UV filter amounts.
Implementation Method 1
In an electrostatic spaying device a voltage generator creates a high voltage which electrically charges the compounds of the cosmetic product. This results into a spray of the cosmetic product.
Implementation Method 2
sun screen formulations include in addition to UV-A and UV-B filters emollients and other skin caring additives. Due to their electrical characteristic, i.e. resistivity and permittivity, most of the emollients show a worse electrostatic sprayability.
Data Source
AI summary
The present invention relates to an electrostatically sprayable cosmetic formulation having a sufficient sun protection factor, water resistance and caring effect, and which provides a sufficient, i.e. nearly full, coverage of the skin surface, when the formulation is applied on the surface of the skin by electrostatic spraying.