Sunscreen Emulsion Fatty Acid Neutralization Water Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sunscreen cosmetics experience a decrease in UV protective effect when exposed to water or sweat, leading to inferior water resistance and instability of UV-absorbing agents, which compromises their protective capabilities.
Innovation Solution
An oil-in-water emulsion sunscreen cosmetic is developed with a UV absorbing agent and/or UV scattering agent blended with a fatty acid, where the neutralization rate of the fatty acid is set to 51% or less, enhancing the UV protective effect upon contact with moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sunscreen cosmetics are applied to skin, then UV protective effect is provided initially, but UV protective effect decreases when exposed to water or sweat
Solution Approach 1:
The patent changes the chemical parameter of the fatty acid neutralization rate to 51% or less, creating a specific chemical state that enables the emulsion to improve UV protection upon water contact. This parameter change transforms the system's response to water from degradation to enhancement, resolving the contradiction between initial protection and water-induced deterioration.
Solution Approach 2:
The patent creates a dynamic system where the UV protective effect is not static but evolves over time. The emulsion is designed to undergo beneficial changes when exposed to water or sweat, transforming from a state of potential instability to enhanced UV protection. This dynamic behavior resolves the contradiction by making the system adaptively improve rather than degrade.
2Ease of operation
If oil-in-water emulsion is used for fresh feeling, then ease of operation is improved, but water resistance deteriorates
Solution Approach 1:
The patent changes the neutralization rate parameter of fatty acids to 51% or less, which fundamentally alters the emulsion's interaction with water. This parameter change enables the oil-in-water emulsion to achieve both fresh feeling and improved water resistance, transforming water from a harmful factor to a beneficial trigger for enhanced UV protection.
3Reliability
If high concentration of silicone resin or film-forming agent is added to improve water resistance, then reliability is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent changes the chemical composition parameter by controlling fatty acid neutralization rate to 51% or less, achieving water resistance without requiring high concentrations of silicone resins or film-forming agents. This parameter change eliminates the need for complex additives that would compromise user comfort, resolving the contradiction between water resistance and ease of operation.
Solution Approach 2:
The patent extracts the water resistance function from complex silicone resin systems and implements it through a simplified fatty acid-based mechanism. By removing the need for high concentrations of film-forming agents, the patent achieves water resistance while maintaining the simplicity and comfort of oil-in-water emulsions.
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 UV protective effect is significantly improved after contact with water or sweat, maintaining or even exceeding initial application levels without the need for high concentrations of silicone resins or film-forming agents, while maintaining a fresh feel and easy removability.
Implementation Method 1
an oil-in-water emulsion sunscreen cosmetic
Implementation Method 2
the neutralization rate of the fatty acid is 51% or less
Data Source
Figure 1
AI summary
The purpose of the present invention is to provide an oil-in-water emulsified sunblock cosmetic exhibiting an excellent feeling when used and capable of maintaining a high ultraviolet-ray protective effect even upon contact with water or sweat after application. The present invention pertains to an oil-in-water emulsified sunblock cosmetic containing an (A) ultraviolet-ray protective agent and a (B) fatty acid forming a solid at room temperature, the oil-in-water emulsified sunblock cosmetic being characterized in that 51% or less of the fatty acid is neutralized, and the formulation ratio ((A)/(B)) of the (A) ultraviolet-ray protective agent to the (B) fatty acid is in the range of at least 0.1 and less than 10.0. This cosmetic exhibits the unprecedented property of contact with water causing an improvement to the ultraviolet-ray protective ability thereof. It is preferable for the cosmetic to also contain an (C) oily component having an IOB of 0.5 or higher.