SPF Liquid Cleansing Compositions with Residual UV Protection
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Solution Overview
Problem
Existing liquid skin cleansing compositions fail to provide adequate protection against ultraviolet radiation after rinsing, as they do not leave a sufficient residual deposit on the skin or hair to effectively block or absorb UV radiation in the critical wavelength range.
Innovation Solution
A liquid skin cleansing composition comprising red petrolatum, surface-treated metal oxide pigments, organic sunscreen agents with a log P greater than 4.0, lathering anionic and non-ionic surfactants, alkyl silicone, and volatile cyclic silicone, which, after rinsing, deposits a film on the skin or hair to provide a sun protection factor (SPF) of at least 6 by blocking or absorbing UV radiation in the 290 nm to 400 nm range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional liquid skin cleansing compositions are used, then the skin is cleaned effectively, but adequate protection against ultraviolet radiation is not provided after rinsing
Solution Approach 1:
The invention combines multiple sunscreen agents (metal oxide pigments like zinc oxide and titanium dioxide, organic sunscreen agents with log P greater than 4.0) with cleansing surfactants and film-forming agents (alkyl silicones, volatile cyclic silicones) to create a composite cleansing composition that both cleanses and provides residual UV protection. This composite approach allows the composition to deliver both cleaning functionality and sustained sunscreen protection after rinsing.
Solution Approach 2:
The invention specifies particular parameters for the sunscreen agents, including organic sunscreen agents with log P greater than 4.0 to ensure adequate lipophilicity for film formation and retention on skin after rinsing. The metal oxide pigments are surface-treated to optimize their dispersion and protective properties. These parameter specifications ensure the composition leaves sufficient residual deposit for reliable UV protection.
2Object-affected harmful factors
If high concentrations of sunscreen agents are used to provide adequate SPF, then UV protection is improved, but the composition becomes less suitable for rinsing applications
Solution Approach 1:
The invention uses organic sunscreen agents with specifically controlled log P values greater than 4.0, which provides optimal balance between solubility and film-forming capability. This parameter control allows the sunscreen agents to remain effectively bound to the skin after rinsing while maintaining composition fluidity and rinseability. The surface treatment of metal oxide pigments also optimizes their performance at lower concentrations.
Solution Approach 2:
The combination of multiple sunscreen agents with complementary properties (metal oxide pigments for physical blocking, organic agents for absorption) allows achieving adequate SPF at lower overall concentrations than would be required with single agents, maintaining rinsing suitability while providing effective UV protection.
3Object-affected harmful factors
If the composition provides sufficient residual deposit for SPF protection, then UV protection is improved, but the formulation complexity increases
Solution Approach 1:
The invention employs a composite system combining metal oxide pigments (zinc oxide, titanium dioxide) with organic sunscreen agents and film-forming silicones. This composite approach leverages the complementary strengths of each component type to achieve synergistic UV protection, where the metal oxides provide physical blocking and the organic agents provide absorption, while the silicones ensure film formation and retention.
Solution Approach 2:
The surface treatment of metal oxide pigments with specific coatings optimizes their local properties for dispersion, stability, and UV blocking efficiency. The organic sunscreen agents are selected with specific log P values to ensure they partition appropriately between water and oil phases, concentrating at the skin interface where UV protection is needed.
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 effectively provides a residual SPF of at least 6 after rinsing, offering protection against ultraviolet radiation by combining the blocking and absorbing capabilities of its ingredients, as demonstrated by the presence of specific surface-treated metal oxides and organic sunscreens, along with surfactants and silicones that ensure deposition on the skin or hair.
Implementation Method 1
at least one surface-treated metal oxide pigment that blocks ultraviolet radiation in the wavelength range of from about 290 nm to about 400 nm
Implementation Method 2
at least one organic sunscreen agent having a log P of greater than about 4.0 that blocks or absorbs ultraviolet radiation in the wavelength range of from about 290 nm to about 400 nm
Implementation Method 3
after rinsing, deposits a film on the skin or hair to provide a sun protection factor (SPF) of at least 6
Data Source
AI summary
The present application relates to a facial and/or body wash composition that after rinsing provides a sun protection factor of at least about 6 comprising (i) red petrolatum; (ii) at least one surface-treated metal oxide pigment that blocks ultraviolet radiation in the wavelength range of from about 290 nm to about 400 nm; (iii) at least one organic sunscreen agent having a log P of greater than about 4.0 that blocks or absorbs ultraviolet radiation in the wavelength range of from about 290 nm to about 400 nm; (iv) at least one lathering anionic surfactant; (v) at least one lathering non-ionic surfactant; (vi) an alkyl silicone; and (vii) a volatile cyclic silicone.