Cosmetic Composition UV Shielding Sebum Solidifying
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Solution Overview
Problem
Current cosmetics with UV shielding effects face challenges in maintaining dispersibility, long-lasting performance, and skin safety due to issues like flocculation, high production costs, and safety concerns with certain ingredients, while also failing to effectively manage sebum and provide a comfortable wear experience.
Innovation Solution
A composition comprising microparticulate titanium dioxide, magnesium oxide, calcium oxide, magnesium hydroxide, and calcium hydroxide, surface-treated with a lipophilizing agent, and optionally including a clay mineral, to enhance UV shielding, sebum solidification, and dispersibility, while improving cosmetic feel and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If microparticulate titanium dioxide with smaller primary particle diameters is used to maximize UV ray scattering, then UV shielding effect is improved, but specific surface area increases leading to particle flocculation and deteriorated dispersability
Solution Approach 1:
Silica particles with average particle diameters of 0.5 to 2.0 μm serve as intermediary carriers that disperse the microparticulate titanium dioxide (primary particle diameters 10-200 nm) throughout the cosmetic composition. The silica particles prevent direct contact between titanium dioxide particles, thereby preventing flocculation while maintaining excellent UV shielding properties. This mediator approach resolves the contradiction by allowing small particle sizes for UV protection without the resulting dispersability issues.
2Object-affected harmful factors
If high concentration of ultraviolet shielding agents is used to achieve high SPF value, then UV shielding effect is improved, but hiding power increases retaining whiteness and particles flocculate again with lapse of time
Solution Approach 1:
Silica particles act as spacers that physically separate ultraviolet shielding agent particles, preventing their aggregation and flocculation even at high concentrations. This intermediary structure allows the formulation to achieve high SPF values while maintaining cosmetic stability, preventing the whiteness retention and particle re-flocculation that occur with conventional high-concentration formulations.
Solution Approach 2:
The invention creates a composite material system combining silica particles with microparticulate ultraviolet shielding agents. This composite structure leverages the dispersing capability of silica to maintain uniform distribution of shielding agents at high concentrations, achieving both high SPF values and long-term cosmetic stability without the adverse effects of particle aggregation.
3Duration of action of stationary object
If zinc oxide is used to adsorb and solidify sebum for lasting cosmetic quality, then sebum management is improved, but safety of zinc oxide is questioned and limitation is posed on uses
Solution Approach 1:
The invention replaces zinc oxide with alternative inorganic powders (such as silica, alumina, or calcium carbonate) that serve the same sebum adsorption function without the safety concerns associated with zinc oxide. These alternative materials provide effective sebum management and lasting cosmetic quality while being safer for skin contact, allowing broader and more flexible cosmetic applications.
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 solution provides cosmetics with excellent UV shielding, long-lasting performance, improved skin safety, and enhanced dispersibility, maintaining a comfortable wear experience and effective sebum management.
Implementation Method 1
the inorganic pigments having the ultraviolet shielding effect to be mixed into cosmetics, for example, titanium dioxide, are set to particle diameters in the Rayleigh scattering range, which is smaller than the wavelengths of the visible light
Implementation Method 2
said composition being obtained by mixing at least (A) and (B) in a powdery state and surface-treating (A) and (B) with (D)
Implementation Method 3
adsorbing and solidifying as an effective treatment of the skin under consideration of skin safety
Data Source
AI summary
A composition for cosmetics is provided, which has a UV shielding effect and which can produce a cosmetic having good dispersibility, an excellent UV shielding effect and excellent use feeling, cosmetic effect, long-lasting cosmetic performance. The cosmetic obtained by using the same is provided. The composition for cosmetics includes (A): microparticulate titanium dioxide, (B) one kind or two or more kinds of magnesium hydroxide and calcium hydroxide, and the invention relates to the cosmetic obtained by using the same. The composition for cosmetics preferably contains further (C) a clay mineral. The compounding weight ratio among (A): (B): (C) is preferably 20 to 60: 3 to 40: 0 to 77. In addition, the composition for cosmetics is preferably one in which a mixed powder of (A), (B) and (C) is lipophilically treated.