DHA Skin Toning Agent with Water-Wax-Oil Matrix
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Solution Overview
Problem
Existing skin toning agents with DHA face challenges in forming emulsifier-free formulations with water, wax, and oil, which are stable and provide immediate tinting and freshness effects without causing skin irritation.
Innovation Solution
A skin toning agent comprising DHA, water, wax, and oil, with a wax:oil ratio of 0.8:1 to 2.3, and no emulsifiers, where DHA is present as free water-soluble DHA, achieving a subtle skin tone and excellent storage stability by maintaining the balance of active ingredients and their ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emulsifiers are used to create stable W/O or O/W emulsions for skin toning, then storage stability is improved, but skin irritation risks increase and the formulation becomes less desirable for sensitive skin
Solution Approach 1:
The patent removes emulsifiers from the formulation entirely, extracting the harmful component while maintaining the core functionality of combining water and oil phases through a different mechanism (wax-based structure)
Solution Approach 2:
The patent changes the formulation parameters by using specific wax-to-oil ratios (0.8:1 to 2.3) and controlled water content (8-35%) to achieve stability without emulsifiers, transforming the system from an emulsion-based approach to a wax-anhydride-based approach
2Stability of the object's composition
If higher proportions of wax and oil are used to achieve paste-like consistency, then product structure and stability are improved, but emulsifiers are required or storage stability deteriorates
Solution Approach 1:
The patent optimizes the wax-to-oil ratio parameter (0.8:1 to 2.3) and water content (8-35%) to achieve the desired paste-like consistency and stability without requiring emulsifiers, simplifying the overall formulation
3Ease of operation
If water content is increased to at least 5-10% to enable freshness effect, then consumer appeal is improved, but formulation stability becomes more difficult to achieve without emulsifiers
Solution Approach 1:
The patent incorporates water at levels of 8-35% into the anhydrous wax-oil matrix, creating a stable formulation that delivers freshness effect without compromising structural integrity or requiring emulsifiers
4Ease of manufacture
If DHA content is increased to achieve stronger skin color, then tinting effect is improved, but the risk of skin irritation increases and subtle tone is lost
Solution Approach 1:
The patent optimizes the DHA concentration parameter (1-3%) to achieve effective skin toning while maintaining a subtle, natural appearance and minimizing the risk of skin irritation
Data Source
AI summary
Cosmetic skin coloring agent comprises: dihydroxyacetone (1-3 wt.%); water (8-35 wt.%); wax (5-30 wt.%); oil (3-35 wt.%); pigment (1-7 wt.%); and further cosmetic auxiliary materials and/or carrier materials with the exception of emulsifiers for the emulsification of water- and oil-phase, where the ratio of wax and oil is 0.8-1:1.5-3 and the skin coloring agent forms a solid mass at room temperature. An independent claim is included for the preparation of cosmetic skin coloring agent, comprising producing a homogeneous water phase comprising dihydroxyacetone and water-soluble cosmetic auxiliary materials at 50-60[deg] C under stirring, producing homogeneous oil phase comprising oil, wax and pigment at 75-88[deg] C, cooling the obtained mixture at 18-25[deg] C, heating the cooled mass at 68-70[deg] C, molding the heated mixture into molds and cooling the filled molds for a period of 6-10 minutes at room temperature.