Sprayable Sunscreen Composition for Wet Skin Application
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Solution Overview
Problem
Existing sprayable sunscreens face issues with oily components coalescing on wet skin, leading to an aesthetically displeasing whitening effect and insufficient UV protection due to inadequate water tolerance, resulting in a greasy feel and non-uniform application.
Innovation Solution
A composition comprising a solvent base, sunscreen active ingredients, and a polymer reaction product of organic diols, polycarboxylic acids, and polyols, which improves water tolerance and provides a dry, uniform film application, reducing whitening and maintaining UV protection on wet skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sprayable sunscreen formulations are applied to wet skin, then they provide UV protection, but the oily components coalesce and form a whitening effect that is aesthetically displeasing
Solution Approach 1:
The patent changes the physical-chemical parameters of the formulation by using a non-aqueous solvent system (alcohol-based) instead of water-based systems, and carefully controlling the ratio of oily components to prevent coalescence on wet skin, thereby eliminating the whitening effect while maintaining UV protection
Solution Approach 2:
The patent uses a composite formulation combining multiple UV filters (organic and inorganic), non-aqueous solvents, and specific oily components in controlled proportions to achieve both water tolerance and aesthetic appearance, preventing the separation and coalescence issues of conventional formulations
2Reliability
If sunscreen formulations are made more water-resistant, then they maintain protection on wet skin, but they may feel greasier and less pleasant to apply
Solution Approach 1:
The patent achieves water resistance through parameter optimization of the non-aqueous solvent system and oily component ratios, rather than using heavy emollients that would compromise application feel, thus maintaining both water resistance and aesthetic properties
3Ease of operation
If conventional sunscreen formulations are applied to wet skin, then they spread easily, but the application becomes non-uniform and insufficient UV protection is provided
Solution Approach 1:
The non-aqueous solvent system parameters are optimized to control evaporation rate and film formation, allowing uniform distribution and evaporation across wet skin surfaces, thereby achieving both easy spreadability and uniform application with sufficient UV protection
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 enhances water resistance and maintains UV protection efficacy even on wet skin, providing a clear, non-greasy, and aesthetically pleasing application, ensuring effective broad-spectrum sun protection.
Implementation Method 1
a solvent base comprising at least one non-aqueous solvent; at least one sunscreen active ingredient; and a polymer reaction product
Implementation Method 2
sprayable sunscreen formulations... dry quickly
Implementation Method 3
organic chemical compounds that chemically absorb UV radiation (organic UV filters) and inorganic compounds that in addition to absorbing, also physically scatter and/or reflect the radiation (UV blockers)
Implementation Method 4
improves water tolerance and provides a dry, uniform film application, reducing whitening and maintaining UV protection on wet skin
Data Source
AI summary
Useful compositions are described herein that comprise a solvent base comprising at least one non-aqueous solvent; at least one sunscreen active ingredient that is a UV blocker and/or a UV absorber; and a polymer reaction product of a random polymerization of at least one organic diol, at least one polycarboxylic acid and at least one polyol having at least three functional groups. Such compositions are particularly useful in clear compositions including sunscreens for personal care including spray sunscreen formulations that are applied to and effective on wet skin, hair or nails.