Water-Soluble Sunscreen Deposition in Personal Cleansing Compositions
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Solution Overview
Problem
Existing personal cleansing compositions face challenges in delivering effective sun protection due to time-consuming application and the difficulty of maintaining sunscreen deposition during bathing or washing, with consumers often disliking the sensorial properties of traditional sunscreens.
Innovation Solution
A personal cleansing composition comprising 0.1 to 10 wt % water-soluble UVA sunscreen, 0.1 to 10 wt % water-soluble UVB sunscreen, and 0.01 to 6 wt % alkali (such as calcium hydroxide, magnesium hydroxide, or beryllium hydroxide) that provides improved sun protection factor (SPF) by forming a higher solubility in water, allowing for enhanced deposition and quick removal, thereby offering improved SPF protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If leave-on compositions comprising sunscreens are applied on to the skin before getting exposed to sunlight, then sun protection is provided, but the application is time consuming and consumers dislike the sensorial properties and sticky or oily feel
Solution Approach 1:
The patent changes the physical-chemical parameters of the sunscreen formulation by using water-soluble sunscreen agents instead of traditional oil-based sunscreens. This parameter change eliminates the sticky or oily feel while maintaining SPF protection, directly resolving the sensorial property issue while preserving the protective function
Solution Approach 2:
The patent inverts the traditional approach by using a wash-off composition instead of a leave-on composition. Rather than leaving sunscreen on the skin, the invention delivers sunscreens through cleansing compositions that are rinsed off, yet still provide enhanced deposition and protection, thereby eliminating application time concerns and sensorial issues
2Ease of operation
If actives e.g. sunscreens are delivered on to the skin through personal cleansing or wash-off compositions, then application time is reduced, but the sunscreens tend to get washed off during bathing or washing
Solution Approach 1:
The patent changes the solubility parameter of the sunscreen agents by selecting water-soluble variants. This parameter change enables the sunscreens to be effectively delivered through water-based cleansing compositions without being washed off, thereby maintaining deposition reliability while reducing application time
Solution Approach 2:
The patent creates a composite formulation by combining water-soluble sunscreen agents with cleansing composition ingredients. This composite approach ensures that the sunscreens remain associated with the skin surface even after rinsing, resolving the contradiction between ease of application and deposition reliability
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 achieves a sun protection factor of at least 5 and up to 50, providing effective UV protection while addressing the challenges of application time and sensorial issues, with improved deposition and removal characteristics.
Implementation Method 1
Sunscreens absorb UV radiations and prevent them from reaching a surface e.g. skin of a user, on to which it is applied. The ability of a sunscreen to provide protection by absorbing UVA radiation is expressed in terms of UVA protection factor (UVAPF); and the ability of a sunscreen to provide protection by absorbing UVB radiation is expressed in terms of sun protection factor (SPF).
Implementation Method 2
a personal cleansing composition comprising select water soluble UVA sunscreen, select water soluble UVB sunscreens and one or more select alkali, resulted in higher deposition of these sunscreens thereby providing improved SPF
Data Source
AI summary
The present invention relates to a personal cleansing composition that provides improved SPF. Particularly, the composition comprises water-soluble UVA sunscreen, water-soluble UVB sunscreen; and an alkali. The invention also relates to a method of and use for providing improved SPF.