Water-Based Powder Composition Thickener Stability
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Solution Overview
Problem
Water-based cosmetic compositions face challenges in achieving high powder dispersibility and stability while maintaining low stickiness, as oil-based compositions cause stickiness and water-based compositions struggle with high powder content dispersion.
Innovation Solution
A powder-containing water-based non-emulsified composition with 20-45% powder and 0.7% or greater of a thickener, including 2-acrylamido-2-methylpropanesulfonic acid or its salt, and a content of 15% or less oily component, which uses polymers like ammonium acryloyldimethyltaurate/beheneth-25 methacrylate crosspolymer for stability and dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If oil-based compositions are used to achieve high powder dispersibility and stability, then powder stability is improved, but stickiness increases
Solution Approach 1:
The patent changes the fundamental parameter of the continuous phase from oil-based to water-based composition. This parameter change allows the system to achieve powder stability through alternative mechanisms (water-soluble polymers, surfactants, and powder surface treatments) while eliminating the stickiness associated with oil-based compositions. The composition maintains high powder content (20-60% by mass) in a water-based continuous phase through careful selection of dispersants and viscosity modifiers.
Solution Approach 2:
The patent employs a composite approach by combining multiple components: water-based continuous phase, powder particles (20-60% by mass), water-soluble polymers for stabilization, surfactants for dispersion, and viscosity modifiers. This composite material system achieves both powder stability and low stickiness by distributing functions across multiple components rather than relying on a single oil-based medium.
2Object-affected harmful factors
If water-based compositions are used to reduce stickiness, then stickiness is reduced, but powder dispersibility and stability deteriorate
Solution Approach 1:
The patent introduces water-soluble polymers, surfactants, and viscosity modifiers as intermediary substances that mediate between the water-based continuous phase and the powder particles. These intermediaries provide steric stabilization, electrostatic repulsion, and enhanced dispersion, enabling high powder content (20-60% by mass) to be maintained stably in water without aggregation or settling.
Solution Approach 2:
The patent modifies several parameters of the water-based system: adjusting pH to optimize charge repulsion, selecting appropriate molecular weight and concentration of water-soluble polymers, optimizing surfactant HLB values, and controlling ionic strength. These parameter changes enable the water-based composition to achieve powder stability comparable to or exceeding oil-based systems while maintaining low stickiness.
3Quantity of substance
If powder content is increased to enhance cosmetic effect, then coverage and opacity are improved, but dispersibility and stability deteriorate
Solution Approach 1:
The patent applies preliminary actions to the powder particles before incorporating them into the final composition. This includes pre-dispersion of powder in suitable media, surface treatment of powder particles with dispersants or coupling agents, and pre-mixing with water-soluble polymers. These preliminary actions prevent aggregation and ensure uniform distribution, enabling high powder content (20-60% by mass) to be maintained stably without settling or clumping.
Solution Approach 2:
The patent uses water-soluble polymers, surfactants, and other intermediary substances that specifically interact with powder surfaces to provide steric and electrostatic stabilization. These intermediaries create protective layers around powder particles, preventing aggregation even at high concentrations (20-60% by mass). The intermediaries also modify the rheology of the continuous phase to maintain suspension stability over time.
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 high powder dispersibility and stability with low stickiness, even at high powder content, ensuring the powder remains on the skin and maintains a fresh feel.
Implementation Method 1
a thickener, in a quantity of 0.7% by mass or more, which is a polymer including 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof as a constituent component
Implementation Method 2
The powder is dispersed in the composition and the powder is at least one selected from the group consisting of synthetic mica, mica, sericite, talc, silica, barium sulfate, zinc myristate, glass powder, titanium dioxide, zinc oxide, boron nitride, silicone resin powder, polymethyl methacrylate powder, and nylon powder
Data Source
AI summary
The present disclosure provides a powder-containing water-based composition having high powder dispersibility and stability even when the content by percentage of powder is high, and also having little stickiness. The powder-containing water-based composition includes (A) an aqueous phase constituting a continuous phase, (B) 10 to 45% by mass of a powder, and (C) 0.7% by mass or greater of a thickener. The thickener is a polymer that includes, as a constituent component, 2-acrylamido-2-methylsulfonic acid or a salt thereof. A content of an oily component is 15% by mass or less relative to the mass of the composition.