Oil-Free Water-Dispersible Sunscreen Composition Without Surfactants
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Solution Overview
Problem
Conventional UV-blocking cosmetics suffer from poor formulation stability, skin troubles, and reduced UV-blocking effects due to the use of oils and inorganic UV-blocking agents, and they often require a large amount of surfactant, leading to poor spreadability and skin irritation.
Innovation Solution
A UV-blocking cosmetic composition dispersed in water, free of oil, utilizing three different types of water-dispersible aromatic UV-blocking agents: phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, and methylene bis-benzotriazolyl tetramethylbutylphenol or tris-biphenyl triazine, with specific weight percentages to ensure excellent spreadability, stability, and UV-blocking effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inorganic UV-blocking agents are used to achieve UV-blocking effects, then UV protection is provided, but a large amount of surfactant is required which leads to poor spreadability and skin troubles
Solution Approach 1:
The patent removes inorganic UV-blocking agents from the formulation and replaces them with organic UV-blocking agents. This extraction of the problematic inorganic component eliminates the need for large amounts of surfactant, thereby resolving the contradiction between UV protection and spreadability
Solution Approach 2:
The patent changes the type of UV-blocking agent from inorganic to organic, which fundamentally alters the formulation requirements. Organic UV-blocking agents do not require surfactants for dispersion, thus improving spreadability while maintaining UV protection efficacy
2Stability of the object's composition
If oils are used in cosmetic formulations to maintain stability, then formulation stability is improved, but skin troubles occur due to oil film formation and pore blockage
Solution Approach 1:
The patent completely removes oils from the formulation, including mineral oil, plant oil, and animal oil. This extraction eliminates the harmful effects of oil film formation and pore blockage while maintaining formulation stability through alternative water-soluble components
Solution Approach 2:
The patent changes the formulation base from oil-based to water-based, fundamentally altering the vehicle in which UV-blocking agents are dispersed. This parameter change eliminates skin troubles associated with oils while maintaining cosmetic performance
3Device complexity
If organic UV-blocking agents are used, then formulation is simpler, but poor formulation stability occurs such as precipitation during storage
Solution Approach 1:
The patent uses a composite approach by combining multiple organic UV-blocking agents with different chemical structures and UV absorption spectra. This composite formulation enhances stability by preventing precipitation through synergistic interactions while maintaining relative formulation simplicity
Solution Approach 2:
The patent employs asymmetric molecular structures of different organic UV-blocking agents (e.g., phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, methylene bis-benzotriazolyl tetramethylbutylphenol) to achieve stable dispersion in water without requiring complex stabilizing systems
4Ease of operation
If water-in-silicone formulations are used, then spreadability is improved, but separation phenomenon occurs due to poor compatibility between silicone oil and general oil
Solution Approach 1:
The patent removes silicone oil from the formulation and uses water as the sole base. This extraction eliminates the compatibility issues between silicone oil and other oils while maintaining good spreadability through the water-based formulation
Solution Approach 2:
The patent creates a homogeneous water-based formulation containing only water-soluble organic UV-blocking agents. This homogeneity prevents separation phenomena by ensuring all components are compatible and uniformly dispersed in the aqueous phase
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 composition provides excellent spreadability, stability, and UV-blocking effects without causing skin troubles, maintaining formulation integrity and reducing skin irritation, while achieving high SPF values.
Implementation Method 1
a UV-blocking agent which is dispersed in water, is free of oil, and includes three different types of water-dispersible aromatic UV-blocking agents
Data Source
AI summary
Provided are an ultraviolet (UV)-blocking cosmetic composition which is dispersed in water and is free of oil and a method of preparing the same. Since the composition does not contain oil, skin trouble may not occur, and since the composition does not include a surfactant, spreadability and feeling of use are excellent. In addition, cloudiness phenomenon or skin greasiness does not occur during use, and the UV-blocking effects are excellent.