Surface-Treated Cosmetic Powder Dispersion Stability
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Solution Overview
Problem
Existing methods for hydrophilically treating silicone resin and organic powders fail to achieve satisfactory dispersibility and long-term dispersion stability in aqueous cosmetics, especially under acidic and alkaline conditions, leading to issues like agglomeration, uneven color, and reduced usability.
Innovation Solution
A surface-treated powder is developed by coating silicone resin and organic powders with a water-soluble polyoxyalkylene glycol derivative, optionally with a cationic polymer and low-molecular organosilicon derivative, using a kneading process to form a stable, non-dissolvable film that maintains hydrophilicity and dispersion stability across a wide pH range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ordinary powders or pigments are used without hydrophilic treatment, then the manufacturing process is simple, but the dispersibility and long-term dispersion stability in aqueous cosmetics are poor
Solution Approach 1:
The patent uses a water-soluble polymer as an intermediary substance to bridge the hydrophobic powder surface and the aqueous cosmetic medium. The polymer forms a coating layer on the powder surface that provides hydrophilic groups for water interaction while maintaining the powder's core properties, thus achieving good dispersibility without complex treatment processes
Solution Approach 2:
The patent creates a composite structure by combining the hydrophobic powder core with a hydrophilic polymer coating. This composite material approach allows the powder to maintain its original functional properties while the polymer layer provides the necessary hydrophilicity for stable dispersion in aqueous cosmetics
2Reliability
If surfactants or water-soluble polymers are used for hydrophilic treatment, then dispersibility improves, but the treatment is difficult to satisfy for dispersing hydrophobic powders under acidic and alkaline conditions
Solution Approach 1:
The patent selects water-soluble polymers with specific chemical properties that remain stable across a wide pH range (pH 3-13). The polymer coating maintains its hydrophilic characteristics and coating integrity under both acidic and alkaline conditions, allowing the powder to disperse stably without agglomeration regardless of the cosmetic's pH environment
Solution Approach 2:
The patent employs a robust polymer coating that forms a durable protective layer on the powder surface. This coating is designed to withstand harsh pH conditions without degrading, effectively replacing the need for complex pH-adjustment mechanisms or multiple treatment steps for different pH environments
3Reliability
If hydrophilic treatment is applied to improve dispersibility, then the powder disperses better in water, but the smooth feeling and moist touch in cosmetics deteriorate
Solution Approach 1:
The patent applies hydrophilic treatment only to the surface of the powder particles through polymer coating, while the interior core of the powder maintains its original hydrophobic properties and smooth surface characteristics. This localized treatment ensures that the powder disperses well in water due to the hydrophilic surface coating, while the smooth feeling is preserved because the bulk material and surface morphology remain unchanged
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 treated powder achieves excellent dispersibility and long-term stability in aqueous media, providing a smooth, moist touch and improved re-dispersibility, enhancing the performance and longevity of cosmetic formulations.
Implementation Method 1
coating the surface of a powder (particle) comprising a silicone resin and/or an organic powder with a specific hydrophilizing agent (surface-treating agent), such as a water-soluble polyoxyalkylene glycol derivative
Data Source
AI summary
By coating the surface of a powder comprising a silicone resin and/or an organic powder with a specific hydrophilizing agent, such powder is hydrophilized. The hydrophilizing agent includes water-soluble polyoxyalkylene glycol derivatives. The organic powder is at least one selected from PMMA, nylon, polyester, polystyrene, cellulose, silicone elastomer powder, silicone rubber powder, benzoguanamine, styrenedivinylbenzene pinhole polymer, ethylene tetrafluoride, polyethylene powder, polypropylene powder, polyurethane powder, silk powder, metal soap powder, starch powder, N-acylated lysine, an organic pigment, and a composite of at least one of these organic powders described above with a metal oxide and/or a metal hydroxide. Such coated (treated) powder has extremely great dispersibility (ease of dispersion) and very good dispersion stability (long-term dispersion stability with lapse of time) in aqueous dispersion media, particularly under acidic and alkaline conditions, specifically at pH 3 through 13. Using the surface-treated powder, additionally, a dispersion with good dispersibility (ease of dispersion) and great dispersion stability, preferably for cosmetics can be provided. The use of the surface-treated powder, or the use of the dispersion can provide further a cosmetic excellent in dispersibility and dispersion stability and further in re-dispersibility and dispersion stability with lapse of time and smooth feeling as compared to the related art when selecting aqueous cosmetic as an agent form.