Zinc Layered Material Particle Size Control for Hair Care Buildup
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Solution Overview
Problem
Current hair care compositions with anti-dandruff particulates, such as those containing zinc carbonate, result in particulate deposition on hair and scalp, leading to a negative impact on hair feel and perception of cleanliness, with larger particle sizes exacerbating the issue.
Innovation Solution
A personal care composition featuring a zinc-containing layered material with reduced particle size (0.5-4 μm) and a cationic polymer, which increases silicone deposition on hair while reducing crystalline structurant deposition, thereby enhancing hair conditioning and minimizing buildup residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If zinc carbonate particle size is reduced, then silicone deposition on hair increases and structurant deposition decreases, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by reducing the particle size of zinc carbonate from conventional sizes (5-7 μm D50) to a smaller range (0.5-4 μm D50). This parameter modification directly resolves the technical contradiction by enabling increased silicone deposition and reduced structurant buildup while accepting the trade-off of more complex manufacturing processes required to achieve and control the smaller particle size distribution.
2Ease of operation
If zinc carbonate particle size is reduced, then hair conditioning improves and buildup residue decreases, but production cost increases
Solution Approach 1:
The patent modifies the particle size parameter of zinc carbonate to resolve the contradiction between improved hair conditioning performance and increased production cost. The reduced particle size (0.5-4 μm D50) delivers superior conditioning by enhancing silicone deposition and reducing structurant buildup, while the patent acknowledges that achieving this particle size distribution through processes like jet milling or classification increases manufacturing costs.
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 improved consumer hair conditioning, reduced buildup, and a cleaner feel by increasing silicone deposition and decreasing ethylene glycol distearate deposition on hair, with smaller zinc carbonate particles providing a higher surface area for enhanced performance.
Implementation Method 1
reducing zinc carbonate particle size results in an increase in silicone deposition on hair
Implementation Method 2
smaller zinc carbonate particles providing a higher surface area for enhanced performance
Data Source
AI summary
The present invention is directed to a personal care composition is disclosed comprising: a detersive surfactant from about 2% to 50%; an anti-dandruff active; a cationic polymer; a zinc-containing layered material wherein the zinc-containing layered material has a particle size in the range of from about 0.5 um to 4 um; wherein the ratio of silicone deposition to crystalline structurant deposition is greater than about 5.