Sunscreen Formulation Reduces Textile Staining via Ion Complexation
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Solution Overview
Problem
Existing sunscreen preparations containing non-water-soluble UV-A filters like 4-(tert-butyl)-4'-methoxydibenzoylmethane and (2-[-4-(diethylamino)-2-hydroxybenzoyl] benzoic acid hexyl ester tend to stain and discolor light-colored textiles, and these stains are difficult to remove during washing, often worsening due to interactions with washing water ions.
Innovation Solution
A cosmetic preparation, preferably an oil-in-water emulsion, containing polyglyceryl-10 stearate in concentrations of 0.1 to 1.5% and linalool, along with other ingredients such as glyceryl stearate, phenoxyethanol, cellulose gum, and tetrasodium iminodisuccinate, which facilitates easier removal of these UV filters from contaminated textiles during washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-water-soluble UV-A filters such as butyl methoxydibenzoylmethane and diethylamino hydroxybenzoyl hexyl benzoate are used in sunscreen preparations, then UV protection efficacy is improved, but staining and discoloration of light-colored textiles occurs and stains become difficult to remove during washing
Solution Approach 1:
The patent introduces washing water ions (calcium, magnesium, or aluminum ions) as intermediaries that interact with the UV filters adhering to textiles. These ions form complexes with the non-water-soluble UV filters, making them more soluble and easier to remove during the washing process, thereby reducing textile staining while maintaining UV protection efficacy
Solution Approach 2:
The patent changes the chemical parameters of the washing system by introducing specific ions (Ca2+, Mg2+, or Al3+) at controlled concentrations (0.01-5% by weight). This parameter change transforms the properties of the UV filters on textiles, converting them from a state that causes staining to a state that facilitates removal during washing
2Ease of operation
If conventional detergents are used to wash textiles contaminated with sunscreen, then washing process is simple, but stains are almost impossible to remove and discolorations are exacerbated during washing
Solution Approach 1:
The patent modifies the washing parameters by adding specific ions (calcium, magnesium, or aluminum salts) to the washing water or detergent composition. This changes the chemical environment during washing, enabling the removal of UV filter stains that are otherwise resistant to conventional detergents, while maintaining operational simplicity
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 significantly reduces the yellow staining on cotton textiles after washing, as demonstrated by a comparative experiment showing lower b values in the CIE-Lab color measurement system, indicating less yellow residue post-washing.
Implementation Method 1
a mixture of polyglyceryl-10 stearate (INCI Polyglyceryl-10 Stearate) and linalool in cosmetic preparations containing UV sunscreen filters to facilitate the washing out of the UV sunscreen filters from textiles
Data Source
AI summary
The present invention relates to a cosmetic preparation which contains one or more UV filters, polyglyceryl-10 stearate (INCI) and linalool, 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 linalool being added to the preparation. The invention also relates to the use of a mixture of polyglyceryl-10 stearate (INCI) and linalool in cosmetic preparations that contain UV filters to facilitate the removal by washing of UV filters from textiles contaminated with the preparations.