Antiperspirant Stick O/W Emulsion Dimensional Stability
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Solution Overview
Problem
Existing antiperspirant cosmetic preparations, particularly in the form of O/W emulsions, face challenges with dimensional stability and skin compatibility due to the use of short-chain alkane-1,2-diols, which can be irritating and cause allergic reactions, while also being prone to deformation and cracking under temperature fluctuations.
Innovation Solution
A cosmetic preparation comprising 0.1% to 2.5% alkane-1,2-diols with an alkyl chain of 3 to 5 carbon atoms, combined with specific emulsifiers, fatty alcohols, oils, waxes, antiperspirant active ingredients, and water, formulated to achieve a penetration force value of 300 gram force to 600 gram force, ensuring firmness and dimensional stability while minimizing skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If short-chain alkane-1,2-diols are used in high concentrations to prevent freezing and maintain solid form, then the preparation remains solid and dimensionally stable, but skin irritation and allergic reactions increase
Solution Approach 1:
The patent changes the concentration parameter of alkane-1,2-diols from high (4-25% in prior art) to low (0.1-2.5%), and compensates by adjusting other formulation parameters including emulsifier types and ratios, fatty alcohol content, and wax selection to maintain solid stability at lower diol concentrations
Solution Approach 2:
The patent uses a composite emulsion system combining multiple emulsifiers (at least two different types), fatty alcohols, oils, and waxes to create a synergistic formulation that maintains solid stability with minimal alkane-1,2-diols, reducing skin irritation while preserving dimensional stability
2Object-affected harmful factors
If high water content is used to provide cooling sensation, then skin compatibility improves, but the preparation loses solid form and shape retention
Solution Approach 1:
The patent optimizes the water content parameter within a specific range (40-70%) and combines it with low alkane-1,2-diol concentrations (0.1-2.5%) and specific emulsifier systems to achieve a balance where the preparation maintains solid form while providing cooling sensation through adequate water content
Solution Approach 2:
The patent creates a composite O/W emulsion system with multiple components (emulsifiers, fatty alcohols, oils, waxes, and low levels of alkane-1,2-diols) that work synergistically to maintain solid stability even with high water content, enabling both shape retention and cooling effect
3Object-affected harmful factors
If the preparation is formulated as a cream with high water content, then skin compatibility improves, but ease of application decreases due to lack of solid form
Solution Approach 1:
The patent adjusts the formulation parameters to create a solid stick form (low alkane-1,2-diol content combined with specific emulsifier and wax ratios) that can be directly applied, while maintaining adequate water content for skin compatibility and cooling sensation
4Stability of the object's composition
If conventional emulsifier systems are used to maintain stability, then emulsion stability improves, but skin compatibility deteriorates due to skin-irritating effects
Solution Approach 1:
The patent changes the emulsifier system parameters by selecting specific types and ratios of emulsifiers that provide adequate emulsion stability with lower alkane-1,2-diol concentrations (0.1-2.5%), thereby reducing skin irritation while maintaining emulsion stability
Solution Approach 2:
The patent employs a composite emulsifier system combining at least two different emulsifier types along with fatty alcohols, oils, and waxes to achieve stable emulsion formation with minimal skin-irritating additives, improving skin compatibility while maintaining emulsion stability
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 formulation provides improved skin compatibility, low allergenic potential, and dimensional stability, allowing for effective antiperspirant performance without deformation or cracking, even under extreme temperature conditions.
Implementation Method 1
cosmetic preparation in the form of an O/W emulsion
Implementation Method 2
emulsifiers
Implementation Method 3
The incorporation of alkane-1,2-diols with an alkyl chain having 3 to 5 carbon atoms is a common method for lowering the freezing point and thus preventing freezing of antiperspirant sticks
Implementation Method 4
antiperspirants are products designed to inhibit the secretion of sweat (transpiration) by blocking the sweat gland ducts
Data Source
AI summary
The invention relates to a cosmetic preparation in the form of an O/W emulsion with improved skin compatibility, having short-chain alkane -1,2-dioles, emulsifiers, fatty alcohols, oils, waxes, carboxylic acids, antiperspirant agents and water, the preparation being characterised in that it is solid and dimensionally stable.