Cosmetic Emulsifier Stabilizing UV Protectants in Water Phase
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Solution Overview
Problem
Existing oil-in-water emulsion cosmetics struggle to stably blend ultraviolet protectants while maintaining a soft texture and providing good skin feel, as they often result in dryness and instability when using high quantities of protectants.
Innovation Solution
Incorporating a (meth)acrylic acid/alkyl (meth)acrylate/(meth)acrylic acid-POE monoalkyl ether ester copolymer as an emulsifier, along with a non-ionic surfactant and higher alcohol, to create an α-gel structure that stabilizes ultraviolet protectants and enhances the cosmetic's texture and spreadability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultraviolet protectants are blended into the oil phase to achieve high sunscreen effects and excellent stability, then ultraviolet protection performance is improved, but the cosmetic becomes difficult to wash away and causes dryness
Solution Approach 1:
The patent inverts the conventional approach by blending ultraviolet protectants into the water phase instead of the oil phase. This is achieved by using a specific copolymer emulsifier that enables stable dispersion of ultraviolet protectants in water, thereby maintaining high sunscreen effects while improving washability and reducing dryness.
Solution Approach 2:
The patent changes the phase distribution parameter of ultraviolet protectants from oil-phase to water-phase blending. By adjusting the emulsifier system to include a specific copolymer with prescribed compositional ratios, the patent achieves stable water-phase blending while maintaining protection performance.
2Reliability
If high quantities of ultraviolet protectants are used to improve sunscreen effects, then ultraviolet protection performance is improved, but a feeling of dryness occurs
Solution Approach 1:
The patent introduces a specific copolymer emulsifier as an intermediary substance that enables high quantities of ultraviolet protectants to be blended into the water phase. This mediator allows the ultraviolet protectants to maintain their protective function while being distributed in a manner that prevents dryness on the skin.
3Ease of operation
If acrylic polymers are used as thickeners to obtain soft texture and excellent spreadability, then texture quality is improved, but stable blending of ultraviolet protectant is not realized
Solution Approach 1:
The patent uses a composite emulsifier system consisting of a specific copolymer with prescribed compositional ratios. This composite material combines emulsifying and thickening functions, enabling both stable blending of ultraviolet protectants and soft texture with excellent spreadability.
4Ease of operation
If oil-in-water emulsion is used to provide easy washability and improved feeling in use, then ease of washing away is improved, but stable blending of ultraviolet protectant becomes difficult
Solution Approach 1:
The patent changes the blending parameter by using a specific copolymer emulsifier that enables ultraviolet protectants to be stably blended into the water phase of oil-in-water emulsions. This parameter change maintains the easy washability of oil-in-water emulsions while achieving stable protectant blending.
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 allows for stable blending of ultraviolet protectants across a wide wavelength range, providing a uniquely soft texture and dewy feeling, while maintaining emulsion stability and preventing stickiness.
Implementation Method 1
an oil-in-water emulsion cosmetic that provides a dewy feeling in use while having a uniquely soft texture in use, while also allowing an ultraviolet protectant to be stably blended therein
Implementation Method 2
introducing an α-gel structure, it is possible to obtain a cosmetic that provides excellent sunscreen effects, in which an ultraviolet protectant is stably blended, while having a uniquely soft texture in use
Data Source
AI summary
Provided is a cosmetic having a unique soft and springy feeling in use, capable of stably formulating therein a UV protector, and providing a light feeling in use such that the cosmetic is separated into pieces when applied to the skin. The present invention relates to a cosmetic characterized by comprising (A) a (meth)acrylic acid/an alkyl (meth)acrylate/a (meth)acrylic acid-POE monoalkyl ether ester copolymer, (B) a UV protector, (C) a nonionic surfactant, and (D) a higher alcohol.