Cosmetic Composition Using C8-10 Poly-Glucoside to Prevent Agglomeration
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Solution Overview
Problem
The combination of nano-sized organic UV filters like Tinosorb® M with inorganic micropigments in cosmetic compositions often results in an undesirable 'cottage-cheese' like appearance, which is unsuitable for the cosmetic industry.
Innovation Solution
An aqueous dispersion of nano-sized methylene bis-benzotriazolyl tetramethylbutylphenol stabilized by C8-10 alkyl poly-glucoside, specifically caprylyl and capryl poly-glucoside, is used in combination with inorganic micropigments, avoiding the use of C12-16 alkyl poly-glucosides to stabilize the mixture and prevent agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If C12-16 alkyl poly-glucoside is used to stabilize the dispersion of nano-sized organic UV filter and inorganic micropigment, then the dispersion stability is improved, but the cosmetic composition exhibits an undesirable 'cottage-cheese' like appearance
Solution Approach 1:
The patent changes the molecular parameter of the alkyl poly-glucoside from C12-16 chain length to C8-10 chain length. This parameter change reduces the surfactant's ability to form large aggregates that cause cottage-cheese appearance, while still providing sufficient stabilization for dispersion stability.
Solution Approach 2:
The patent uses a shorter-chain alkyl poly-glucoside (C8-10) that provides adequate stabilization for the application duration needed, without the long-lasting aggregate formation problems of longer-chain variants. The shorter chain length naturally limits the extent of aggregation.
2Reliability
If nano-sized organic UV filter is combined with inorganic micropigment in cosmetic composition, then the UV protection is improved, but the cosmetic composition exhibits an undesirable 'cottage-cheese' like appearance
Solution Approach 1:
The alkyl poly-glucoside acts as an intermediary substance between the nano-sized organic UV filter and inorganic micropigment. It prevents direct aggregation between these two components, maintaining both UV protection functionality and aesthetic appearance by mediating their interaction at the molecular level.
Solution Approach 2:
The patent changes the stabilizer parameter from C12-16 alkyl poly-glucoside to C8-10 alkyl poly-glucoside. This parameter change in the stabilizer's hydrocarbon chain length reduces its tendency to form large micellar structures that cause cottage-cheese appearance, while maintaining sufficient stabilization capability for the UV filter-micropigment combination.
3Stability of the object's composition
If C12-16 alkyl poly-glucoside is used to prevent agglomeration of nano-sized UV filter and micropigment, then the dispersion uniformity is improved, but the cosmetic composition exhibits an undesirable 'cottage-cheese' like appearance
Solution Approach 1:
The patent changes the critical parameter of the alkyl poly-glucoside from C12-16 to C8-10 hydrocarbon chain length. This parameter change fundamentally alters the surfactant's aggregation behavior, reducing the size and extent of micelle formation. The shorter chains provide sufficient steric and electrostatic stabilization for dispersion uniformity without creating the large aggregates responsible for cottage-cheese appearance.
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
This approach allows for the formulation of aesthetically appealing cosmetic compositions that incorporate inorganic micropigments without the unwanted texture issues, maintaining a stable and uniform appearance.
Implementation Method 1
an aqueous dispersion of nano-sized methylene bis-benzotriazolyl tetramethylbutylphenol, wherein the particles are stabilized by a C 8-10 alkyl poly-glucoside
Data Source
AI summary
The present invention relates to an aqueous dispersion consisting of water, a nano-sized, organic, insoluble UV filter and a C8-10 alkyl poly-glucoside as well as to cosmetic compositions comprising said dispersion in combination with at least one inorganic micropigment, characterized in that said cosmetic compositions are substantially free of any C12-16 alkyl poly-glucoside.