Water-Insoluble Sponge Cosmetic with UV Blocking Agents
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Solution Overview
Problem
Cosmetic compositions impregnated in water insoluble sponges experience a reduction in UV blocking effect due to adsorption of oil soluble organic UV blocking agents, resulting in lower-than-expected sun protection factors and grades.
Innovation Solution
Incorporating water soluble or encapsulated UV blocking agents, with oil soluble agents present in less than 10% of the total weight, and using a hydrophobic monomer polymer sponge to prevent adsorption, ensuring a water-in-oil emulsion formulation with the UV blocking agent in the external phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oil soluble organic UV blocking agents are used in cosmetic composition impregnated in water insoluble sponge, then the cosmetic composition can be formulated with effective UV blocking agents, but the UV blocking effect is reduced due to adsorption of the agents to the sponge
Solution Approach 1:
The patent changes the chemical parameter of the UV blocking agent from oil-soluble to water-soluble form. Specifically, it uses water-soluble UV blocking agents (e.g., water-soluble vitamin C derivatives, water-soluble vitamin E derivatives, water-soluble ferulic acid derivatives) instead of traditional oil-soluble agents. This parameter change prevents adsorption to the water-insoluble sponge while maintaining UV blocking efficacy, thereby resolving the contradiction between reliability of UV protection and loss of UV blocking agent.
2Loss of substance
If water soluble UV blocking agents are used, then adsorption to water insoluble sponge is prevented, but the UV blocking strength may be insufficient compared to oil soluble agents
Solution Approach 1:
The patent employs a composite approach by combining multiple water-soluble UV blocking agents with different mechanisms of action. The composition includes water-soluble vitamin C derivatives (antioxidant), water-soluble vitamin E derivatives (membrane protector), water-soluble ferulic acid derivatives (free radical scavenger), and inorganic UV filters (physical barrier). This composite formulation achieves synergistic UV protection while preventing adsorption to the sponge, thus resolving the contradiction between preventing agent loss and maintaining sufficient UV blocking strength.
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
Achieves excellent UV blocking with SPF 30 or above and PA++ or above, while minimizing whitening and maintaining effective UV protection without significant adsorption to the sponge.
Implementation Method 1
the inventors found that when a cosmetic composition having a UV blocking function is impregnated into a water insoluble sponge, there is a problem with an actual sun protection factor/grade that is lower than expected from the total amount of the UV blocking agent included in the cosmetic composition. Further, the inventors identified the cause of the problem - the oil soluble organic UV blocking agent in direct contact with the water insoluble sponge is adsorbed to the water insoluble sponge
Data Source
Figure 1
AI summary
The present disclosure relates to a cosmetic composition having an ultraviolet (UV) blocking function and cosmetics including the cosmetic composition impregnated in a water insoluble sponge, and solves the adsorption problem of the UV blocking agent to the water insoluble sponge, thereby providing an effect on full production of an expected UV blocking effect (sun protection factor/grade) from the UV blocking agent included in the cosmetic composition.