Sunscreen Formulation Using Polyglyceryl-10 Stearate and Citronellol
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Solution Overview
Problem
Existing sunscreen preparations containing non-water-soluble UV-A filters and broadband filters often cause stubborn stains on light-colored textiles, making them difficult to wash out.
Innovation Solution
A cosmetic preparation containing polyglyceryl-10 stearate and citronellol is used, which is free from certain ingredients like 2-hydroxy-4-methoxybenzophenone and 4-methoxycinnamic acid esters, to enhance the washability of UV filters from textiles, forming an oil-in-water emulsion that facilitates easier removal of UV filter stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-water-soluble UV-A filters and broadband filters are used in sunscreen preparations, then UV protection effectiveness is improved, but textile staining increases and washability deteriorates
Solution Approach 1:
The patent introduces polyglyceryl-10 stearate and citronellol as intermediary substances that modify the interaction between UV filters and textiles. These additives form a complex with the UV filters that reduces their affinity for textile fibers, thereby preventing staining while maintaining UV protection. The intermediary substances act as a bridge that allows the UV filters to perform their protective function without transferring to and staining the textile material.
2Reliability
If non-water-soluble UV filters are used, then UV filtering performance is improved, but removal from textiles becomes difficult
Solution Approach 1:
The patent changes the chemical parameters of the UV filter formulation by adding polyglyceryl-10 stearate and citronellol. This modification alters the solubility and binding characteristics of the UV filters, making them more susceptible to washing out from textiles. The parameter change transforms the UV filter system from one that strongly adheres to textiles into one that maintains protection performance but can be easily removed through standard washing processes.
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 use of polyglyceryl-10 stearate and citronellol in sunscreen preparations significantly reduces textile staining and improves the washability of UV filters, as demonstrated by reduced yellow staining on cotton textiles after washing.
Implementation Method 1
forming an oil-in-water emulsion that facilitates easier removal of UV filter stains
Data Source
AI summary
The present invention relates to a cosmetic preparation which contains one or more UV filters, polyglyceryl-10 stearate (INCI) and citronellol, and to a method for allowing the removal by washing of UV filters from textiles that are contaminated with a cosmetic preparation which contains said UV-A filters and/or broadband filters, polyglyceryl-10 stearate (INCI) and citronellol being added to the preparation. The invention also relates to the use of a mixture of polyglyceryl-10 stearate (INCI) and citronellol in cosmetic preparations that contain UV filters to facilitate the removal by washing of UV filters from textiles contaminated with the preparations.