Anionic Polyacrylate Microcapsule Deposition in Hair Conditioners
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Solution Overview
Problem
Current conditioner compositions face challenges in maximizing the deposition and retention of encapsulated benefit agents on hair, as they may be washed off or incompatible with existing hair components, leading to inefficient delivery and retention.
Innovation Solution
A conditioner composition incorporating anionic polyacrylate microcapsules coated with an anionic emulsifier and combined with a deposition aid such as a cationic deposition polymer or aminosilicone, forming a premix that enhances the adhesion and retention of benefit agents on hair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulated benefit agents are deposited onto hair, then conditioning benefits are delivered, but the agents are washed off during conditioning and do not retain effectively
Solution Approach 1:
The invention uses a composite system consisting of polyacrylate microcapsules combined with deposition polymers (such as polyquaternium-53) and surfactants. This composite material approach creates a synergistic effect where the deposition polymer acts as an adhesive binder that bridges the microcapsules to the hair surface, significantly improving retention and reducing wash-off of the encapsulated benefit agents.
Solution Approach 2:
The deposition polymer serves as an intermediary substance between the microcapsules and the hair surface. It facilitates adhesion by forming a bonding layer that anchors the microcapsules to the hair, preventing them from being washed away during conditioning while still allowing the encapsulated agents to be delivered effectively.
2Productivity
If cationic deposition polymer is used to improve microcapsule deposition, then deposition efficiency increases, but compatibility issues arise with other compositional components on hair
Solution Approach 1:
The invention modifies the chemical parameters of the deposition system by selecting specific polymers with controlled charge densities and molecular weights. The use of polyquaternium-53 with its specific cationic charge characteristics allows effective deposition while maintaining compatibility with other hair components. Additionally, the formulation adjusts pH and ionic strength parameters to optimize both deposition efficiency and compatibility.
Solution Approach 2:
The deposition polymer is applied locally at the hair surface where it creates a targeted adhesive zone. This localized action allows the polymer to bind microcapsules specifically at the hair interface without interfering with other compositional components throughout the entire hair structure, thereby maintaining compatibility while achieving high deposition efficiency.
3Adaptability or versatility
If microcapsules are encapsulated to deliver benefit agents, then a wide variety of agents can be delivered, but retention and delivery efficiencies are difficult to improve
Solution Approach 1:
The deposition polymer acts as an intermediary that enhances the delivery reliability of encapsulated benefit agents. It provides a stable anchoring mechanism that ensures microcapsules remain on the hair surface long enough for effective delivery, regardless of the specific type of encapsulated agent, thereby maintaining high delivery efficiency across a wide variety of benefit agents.
Solution Approach 2:
The composite system of microcapsules plus deposition polymer creates a unified delivery vehicle that combines the versatility of encapsulated agents with the reliable adhesion properties of the polymer. This composite approach ensures that diverse benefit agents delivered via different microcapsule formulations all achieve consistent retention and delivery efficiency through the common deposition mechanism.
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 deposition and extended retention of encapsulated benefit agents on hair, maintaining their effectiveness even after extended use, due to the synergy between anionic polyacrylate microcapsules and deposition aids, which form viscoelastic microstructures that adhere strongly to keratinaceous surfaces.
Implementation Method 1
from about 0.01% to about 2% of a deposition aid selected from the group consisting of cationic deposition polymer, aminosilicone, and combinations thereof
Data Source
AI summary
A conditioner composition that increases the deposition and retention of benefit agent containing polyacrylate microcapsules onto hair. The conditioner composition is based on the combination of anionic charged polyacrylate microcapsules, deposition aids, conditioner agents, and a carrier.