Substantive Sunscreen Emulsion with Water-Resistant Polymers
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Solution Overview
Problem
Current skin moisturizing compositions with SPF have drawbacks such as unpleasant tactile properties, low staying power, insufficient moisturization, and inadequate UV protection, being either non-substantive or requiring high oil content for solubilization of UV absorbing ingredients.
Innovation Solution
A cosmetically elegant, substantive emulsion formulation with 40-50% water, 25-30% UV absorbing agents like octocrylene, avobenzone, octisalate, and oxybenzone, and 3-5% water-resistant agents like VP eicosene copolymer, acrylates/C12-22 alkyl methacrylate copolymer, and trimethylsiloxysilicate, providing SPF 50 and remaining effective for 80 minutes in water exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high oil content is used to solubilize UV absorbing ingredients, then UV protection capability is improved, but tactile properties become greasy and unpleasant
Solution Approach 1:
The patent changes the chemical parameters of the formulation by using specific water-soluble UV filters (octocrylene, avobenzone, octisalate, homosalate, oxybenzone) combined with water-resistant polymers, allowing high UV protection with low oil content while maintaining non-greasy tactile properties
Solution Approach 2:
The patent creates a composite formulation combining multiple UV absorbing agents with water-resistant polymers (VP eicosene copolymer, acrylates/C12-22 alkyl methacrylate copolymer, trimethylsiloxysilicate, acrylates/dimethicone copolymer) to achieve both UV protection and water resistance without requiring high oil content
2Quantity of substance
If conventional moisturizing compositions are used, then skin hydration is provided, but staying power is low and composition migrates or pools
Solution Approach 1:
The patent introduces water-resistant polymers as intermediary substances that bind to the UV filters and prevent migration, creating a stable complex that remains on skin during water exposure while maintaining hydration properties
Solution Approach 2:
The patent modifies the formulation parameters by incorporating specific water-resistant polymer compounds that change the rheological and adhesive properties of the composition, enabling it to resist water and perspiration while maintaining skin hydration
3Reliability
If water-resistant agents are added to improve water resistance, then substantivity is improved, but formulation complexity increases
Solution Approach 1:
The patent selects water-resistant agents that perform multiple functions: VP eicosene copolymer and acrylates/C12-22 alkyl methacrylate copolymer provide both water resistance and film formation, while trimethylsiloxysilicate and acrylates/dimethicone copolymer provide water resistance and texture modification, reducing the need for separate functional ingredients
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 formulation offers a stable, long-lasting, water-resistant, and moisturizing sunscreen with a non-greasy feel, effectively protecting against UVA and UVB radiation while maintaining substantivity and skin hydration.
Implementation Method 1
25 to 30% by weight of a combination of octocrylene, avobenzone, octisalate, homosalate, and oxybenzone
Implementation Method 2
3 to 5% by weight of a combination of VP eicosene copolymer, acrylates/C12-22 alkyl methacrylate copolymer, trimethylsiloxysilicate, and acrylates/dimethicone copolymer
Data Source
AI summary
Disclosed is a substantive emulsion and methods for its use comprising 40 to 45% by weight of water, 25 to 30% by weight of a combination of octocrylene, avobenzone, octisalate, homosalate, and oxybenzone, and 3 to 5% by weight of a combination of VP eicosene copolymer, acrylates/C12-22 alkyl methacrylate copolymer, trimethylsiloxysilicate, and acrylates/dimethicone copolymer, wherein the emulsion has a sun protection factor of at least 50, and wherein the emulsion is very water resistant.