UV-Shielding Composite Particles for Cosmetic Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cosmetic materials face challenges in formulating effective ultraviolet-shielding products due to issues like allergic reactions from organic ultraviolet absorbents and difficulties in mixing inorganic and organic agents, particularly in aqueous formulations, which affect product stability and skin safety.
Innovation Solution
Development of ultraviolet-shielding composite particles incorporating metal oxide particles and organic ultraviolet absorbents within a resin matrix, produced through suspension or emulsion polymerization, allowing for their dispersion in both water-in-oil and oil-in-water cosmetic materials without the need for specific solvents, ensuring stability and reduced skin contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic ultraviolet-shielding agents and organic ultraviolet absorbents are jointly used, then the ultraviolet-shielding function is improved, but the organic ultraviolet absorbent recrystallizes due to metal ions causing alteration and discoloration
Solution Approach 1:
The patent introduces an organic solvent as an intermediary substance that mediates between the inorganic ultraviolet-shielding agent and the organic ultraviolet absorbent. The organic solvent dissolves the organic ultraviolet absorbent and forms a complex with the inorganic ultraviolet-shielding agent, preventing direct harmful interactions while maintaining the ultraviolet-shielding function. This resolves the contradiction by using the organic solvent as a buffer that prevents recrystallization and discoloration.
Solution Approach 2:
The patent creates a composite system consisting of inorganic ultraviolet-shielding agent, organic ultraviolet absorbent, and organic solvent working together. The composite structure allows the inorganic agent to provide broad-spectrum shielding while the organic absorbent enhances specific wavelength protection, and the organic solvent maintains stability by preventing recrystallization. This composite approach enables both agents to function synergistically without the harmful effects of direct contact.
2Reliability
If organic ultraviolet absorbent is used to provide ultraviolet-shielding function, then the shielding effect is improved, but the absorbent is insoluble in water requiring specific solvents which limits formulation flexibility
Solution Approach 1:
The organic solvent serves multiple functions simultaneously: it dissolves the water-insoluble organic ultraviolet absorbent, forms a complex with the inorganic ultraviolet-shielding agent to enhance stability, and acts as a bridge enabling the formulation to work in both aqueous and non-aqueous cosmetic products. This multi-functionality resolves the contradiction by making the organic absorbent compatible with water-based formulations while maintaining its shielding effectiveness.
3Reliability
If organic ultraviolet absorbent is used in cosmetic products, then the ultraviolet-shielding function is improved, but sensitive skin users experience allergic symptoms upon repetitive use
Solution Approach 1:
The organic solvent acts as a protective intermediary between the organic ultraviolet absorbent and the skin. By forming a stable complex and preventing recrystallization, the solvent reduces the likelihood of the absorbent precipitating onto the skin, thereby minimizing direct contact and potential allergic reactions in sensitive users while maintaining the shielding function.
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 composite particles provide enhanced stability and safety by preventing recrystallization and discoloration, enabling broader formulation flexibility and maintaining transparency, while ensuring effective ultraviolet shielding without adverse skin reactions.
Implementation Method 1
metal oxide particles having an ultraviolet-shielding function
Implementation Method 2
metal oxide particles...provide ultraviolet-shielding function
Implementation Method 3
organic ultraviolet absorbent...wavelengths of ultraviolet rays, which can be shielded by inorganic ultraviolet-shielding agents and organic ultraviolet absorbents
Implementation Method 4
resin monomers are polymerized through suspension polymerization or emulsion polymerization
Data Source
AI summary
Ultraviolet-shielding composite particles of the invention are ultraviolet-shielding composite particles which include a resin containing an organic ultraviolet absorbent and metal oxide particles having an ultraviolet-shielding function, and have an average particle diameter of 0.05 μm or more and 5 μm or less, in which the metal oxide particles are particles which include one or two or more selected from the group consisting of zinc oxide, titanium oxide, cerium oxide and iron oxide and have an average particle diameter of 0.003 μm or more and 0.1 μm or less, a content of the organic ultraviolet absorbent in the ultraviolet-shielding composite particles is 0.1% by mass or more 80% by mass or less, a content of the metal oxide particles is 1% by mass or more 80% by mass or less, and the metal oxide particles are dispersed in the ultraviolet-shielding composite particles.