Coated Pigment Sunscreen for Stable High SPF Color Matching
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Solution Overview
Problem
Developing a sunscreen product that provides high SPF and pigment concentration while matching various skin tones without compromising stability and sensorial benefits is challenging due to the difficulty in formulating stable color shades that fit diverse skin tones.
Innovation Solution
A customized color shade sunscreen product is created using high concentrations of pigments, specifically titanium oxide, red iron oxide, black iron oxide, and yellow iron oxide coated with stearoyl aluminum glutamate, in various ratios to match different skin tones, ensuring stability and sensorial benefits like dry touch and oil control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high concentration of pigments is used to achieve high coverage and color match for diverse skin tones, then the coverage and color matching improve, but the formula stability deteriorates
Solution Approach 1:
The patent uses coated pigments where a coating layer acts as an intermediary between the pigment core and the sunscreen formula. Specifically, iron oxides are coated with materials like aluminum hydroxide, magnesium hydroxide, or silica, and titanium dioxide is coated with dimethicone or other compatible materials. This coating prevents direct interaction between high concentrations of pigments and the formula components, thereby maintaining formula stability while achieving high pigment loading for excellent coverage and color matching across diverse skin tones.
Solution Approach 2:
The patent employs composite pigment structures consisting of a core material (iron oxide or titanium dioxide) combined with a coating layer (aluminum hydroxide, magnesium hydroxide, silica, dimethicone). These composite materials provide both the color matching properties of the core pigment and the stability benefits of the coating layer, enabling high pigment concentration without compromising formula stability. The composite structure allows for optimized performance in both coverage and stability aspects.
2Quantity of substance
If high concentration of pigments is used to achieve high coverage, then the coverage improves, but the sensorial benefits (dry touch, spreadability, oil control) worsen
Solution Approach 1:
The coating layers on pigments serve as intermediaries that improve sensorial properties. Materials like dimethicone coatings on titanium dioxide and hydroxide-based coatings on iron oxides provide lubricity and compatibility with the sunscreen base formula, ensuring good spreadability and dry touch feel even at high pigment concentrations. The coating prevents pigment aggregation and maintains smooth texture, preserving oil control and other sensorial benefits.
Solution Approach 2:
The patent optimizes the particle size parameters of the pigments to maintain good sensorial properties at high concentrations. By controlling particle size distribution and using appropriately sized coated pigment particles, the formulation achieves excellent coverage while maintaining smooth application, good spreadability, and rapid drying. The parameter optimization ensures that high pigment load does not compromise the ease of application and overall sensorial experience.
3Reliability
If high SPF and high pigment concentration are combined, then the sun protection and coverage improve, but the formula stability deteriorates
Solution Approach 1:
The coated pigment structures act as intermediaries that allow simultaneous achievement of high SPF and high pigment concentration. The coating layers (aluminum hydroxide, magnesium hydroxide, silica, dimethicone) create a protective barrier that prevents destabilizing interactions between the high pigment load and the sunscreen active ingredients or base formula. This enables the formulation to maintain both high sun protection factor and excellent formula stability.
Solution Approach 2:
The use of composite coated pigments enables the formulation to achieve both high SPF and high pigment concentration without stability compromise. The composite structure combines the UV-blocking capabilities of titanium dioxide and iron oxides with the stabilizing properties of the coating materials, allowing the formula to simultaneously deliver high sun protection, excellent coverage, and maintained stability even at elevated pigment levels.
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 product achieves excellent stability and high SPF values, antioxidant effects, infrared protection, and visible light protection while providing a perfect color match for all skin tones, maintaining sensorial benefits like dry touch and oil control.
Implementation Method 1
The first pigment comprises titanium oxide anatase coated with stearoyl aluminum glutamate. The second pigment comprises red iron oxide coated with stearoyl aluminum glutamate. Third pigment comprises black iron oxide coated with aluminum stearoyl glutamate. The fourth pigment comprises yellow iron oxide wrapped with aluminum stearoyl glutamate.
Implementation Method 2
mixing high concentration of pigments with sunscreen products created customized tinted sunscreen products with high coverage and a perfect range of color shades
Data Source
AI summary
A product for providing a customized color shade sunscreen product to match a skin tone of a subject is provided. The product comprises a color dose formulation, an instruction and optionally a sunscreen. The color dose formulation has high concentration of pigments and is suitable for being mixed with a sunscreen to prepare a customized color shade sunscreen product. Also is a method of preparing a customized color shade sunscreen product to match a skin tone of a subject. Such method comprises mixing a selected color dose formulation with a sunscreen. The color dose formulations may be selected from six color shade compositions that offer color shades suitable for all skin tones. The customized color shade sunscreen product may provide a sensorial benefit such as dry touch, good spreadability, no white residues, oil control and UV protection and visible light.