Electrostatic Tanning Formulation for Uniform Propellant-Free Skin Coverage
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Solution Overview
Problem
Existing tanning formulations suffer from uneven application and streaking due to poor electrostatic sprayability, often using environmentally unfriendly propellants, and high ethanol content leading to skin irritation, while maintaining skin care effects.
Innovation Solution
A topical formulation comprising less than 50% ethanol, 20-55% water, 0.5-5% emollient with log Kow 2-10, 0.05-2% antioxidant, 2-20% tanning agent, and 2-15% cosmetic additives, ensuring electrostatic sprayability without propellants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional aerosol sprays with propellant gas are used to atomize and spray the tanning formulation, then the formulation can be sprayed, but the coverage is not uniform and sufficient, and propellants are environmentally unfriendly and hazardous to health
Solution Approach 1:
The invention removes the propellant component entirely from the spray system. The formulation is designed to be sprayable without any propellant gas, eliminating the source of environmental and health hazards while maintaining the spray application functionality through electrostatic charging mechanisms.
Solution Approach 2:
The invention replaces the mechanical propellant-driven spray system with an electrostatic spray system. Instead of using pressurized gas to atomize and propel the formulation, electrostatic charges are applied to the formulation droplets, causing them to be attracted to and uniformly deposit on the skin surface.
2Object-affected harmful factors
If hand application method is used to apply the tanning formulation, then no propellants are needed, but the application is uneven and causes streaking effect
Solution Approach 1:
The invention replaces manual hand application with an electrostatic spray system. The electrostatic charging mechanism ensures uniform distribution and deposition of the formulation on the skin surface, eliminating the streaking and unevenness inherent in manual application while requiring no propellants.
3Ease of operation
If high ethanol content is used in the formulation to improve electrostatic sprayability, then sprayability is improved, but skin irritation increases
Solution Approach 1:
The invention modifies the formulation parameters to achieve optimal electrostatic sprayability without excessive ethanol. By adjusting the balance between ethanol (less than 50 wt.-%), water (20-55 wt.-%), and emollients (0.5-5.0 wt.-%), the formulation achieves sufficient conductivity for electrostatic spraying while maintaining skin compatibility and reducing irritation.
Solution Approach 2:
The invention creates a composite formulation system that combines multiple components with complementary functions. The synergistic interaction between ethanol, water, emollients, and cosmetic additives produces a formulation with optimized electrical properties for electrostatic spraying while maintaining skin care benefits and minimizing irritation.
4Reliability
If emollients are added to the formulation for skin care effect, then skin care benefit is improved, but electrostatic sprayability deteriorates
Solution Approach 1:
The invention optimizes the concentration and selection of emollients to maintain skin care effectiveness while preserving electrostatic sprayability. The emollient content is controlled at 0.5-5.0 wt.-%, and their electrical properties (conductivity, permittivity) are carefully selected to complement rather than hinder the electrostatic charging process.
Solution Approach 2:
The invention develops a composite formulation where emollients work synergistically with ethanol and water to achieve both skin care benefits and sprayability. The specific combination and ratios of these components create a balanced system that satisfies both skin care requirements and electrostatic spraying 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
Achieves nearly full skin coverage with an even tanned appearance and maintains skin care benefits, avoiding skin irritation and environmental harm.
Implementation Method 1
In an electrostatic spraying device, a voltage generator creates a high voltage which electrically charges the compounds of the cosmetic product
Implementation Method 2
This application method can be carried out without the aid of environmentally unfriendly propellants and provides a constant and uniform flow of the product
Data Source
AI summary
The present invention relates to an electrostatically sprayable topical formulation and production process thereof for giving skin a tanned appearance in the absence of ultraviolet radiation exposure and uniformly applied on the skin surface of a subject while maintaining its skin caring effect.