Polyglyceryl Emulsifiers Reduce Sunscreen Staining on Textiles
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Solution Overview
Problem
Existing sunscreens 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 cause stubborn stains on light-colored textiles, which are difficult to remove and worsen during washing.
Innovation Solution
A cosmetic preparation in the form of an oil-in-water emulsion containing polyglyceryl-10 stearate, polyclyceryl-2 caprate, phenoxyethanol, cellulose gum, and tetrasodium iminodisuccinate, along with UV filters such as hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate and 4-(tert-butyl)-4'-methoxydibenzoylmethane, designed to enhance washability and reduce textile staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-water-soluble UV-A filters such as 4-(tert-butyl)-4'-methoxydibenzoylmethane and (2-[-4-(diethylamino)-2-hydroxybenzoyl] benzoic acid hexyl ester) are used in sunscreen preparations, then UV protection is improved, but textile staining increases and washability deteriorates
Solution Approach 1:
The patent introduces specific emulsifiers (polyglyceryl-10 stearate and/or polyglyceryl-2 caprate) as intermediary substances between the non-water-soluble UV filters and the aqueous environment. These emulsifiers form stable emulsion droplets that encapsulate the UV filters, preventing direct contact with textile fibers while maintaining UV protection efficacy. This mediator approach resolves the contradiction by allowing the UV filters to function without causing staining.
Solution Approach 2:
The patent changes the physical-chemical parameters of the sunscreen formulation by specifying precise concentration ranges: polyglyceryl-10 stearate at 0.1-1.5% by weight and polyglyceryl-2 caprate at 0.05-1.0% by weight. These parameter adjustments optimize the emulsion stability and surfactant properties, enabling the non-water-soluble UV filters to remain suspended without staining textiles, thus resolving the contradiction between UV protection and staining.
2Reliability
If non-water-soluble UV filters are used in sunscreen preparations, then UV protection is improved, but ease of operation deteriorates due to difficult stain removal
Solution Approach 1:
The emulsifiers act as intermediaries that prevent UV filter deposition on textiles in the first place. By forming stable emulsion droplets, they keep the UV filters suspended in the aqueous phase rather than allowing them to bind to textile fibers. This preventive approach significantly easestain removal, as the UV filters remain in the washable emulsion phase rather than becoming embedded in fabric.
Solution Approach 2:
The patent optimizes the concentration parameters of the emulsifiers to achieve optimal emulsion stability. At the specified concentrations (polyglyceryl-10 stearate 0.1-1.5% and polyglyceryl-2 caprate 0.05-1.0%), the emulsion remains stable during application and washing, preventing UV filter deposition on textiles and thereby greatly facilitating stain removal while maintaining UV protection.
3Reliability
If conventional sunscreen formulations are used, then UV protection is provided, but product complexity increases due to multiple ingredients needed to reduce staining
Solution Approach 1:
The patent makes the emulsifiers (polyglyceryl-10 stearate and/or polyglyceryl-2 caprate) perform multiple functions simultaneously: they emulsify the non-water-soluble UV filters, stabilize the aqueous formulation, prevent textile staining, and improve overall product consistency. This multi-functionality reduces formulation complexity by eliminating the need for separate additives for each function, while maintaining effective 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 formulation significantly reduces the formation of yellow stains on cotton textiles and improves the washability of sunscreen components, with less residual staining after washing compared to reference preparations.
Implementation Method 1
A cosmetic preparation in the form of an oil-in-water emulsion containing polyglyceryl-10 stearate, polyclyceryl-2 caprate
Implementation Method 2
polyglyceryl-10 stearate (INCI polyglyceryl-10 stearate) and polyclyceryl-2 caprate (INCI polyglyceryl-2 caprate)
Data Source
AI summary
The present invention relates to a cosmetic preparation containing one or more UV filters, polyglyceryl-10 stearate (INCI Polyglyceryl-10 Stearate) and polyglyceryl-2 caprate, as well as a method for increasing the washability of UV filters from textiles contaminated with a cosmetic preparation containing these UV-A filters and/or broadband filters, wherein polyglyceryl-10 stearate (INCI Polyglyceryl-10 Stearate) and polyglyceryl-2 caprate are added to the preparation and the use of a mixture of polyglyceryl-10 stearate (INCI Polyglyceryl-10 Stearate) and polyglyceryl-2 caprate in cosmetic preparations containing UV light protection filters to facilitate the washability of the UV light protection filters from textiles contaminated with the preparations.