Ampholytic-Anionic Polymer Deposition System for Lipophilic Actives
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Solution Overview
Problem
Conventional personal care products, particularly those containing detersive surfactants, are ineffective in depositing lipophilic actives onto keratinous surfaces such as skin, hair, and nails, leading to low deposition and potential skin irritation due to the removal of protective lipids.
Innovation Solution
A personal care deposition composition comprising an ampholytic polymer, an anionic polymer, and a lipophilic material, formulated to optimize the deposition of lipophilic materials onto keratinous substrates, with specific weight ratios and ranges of these components to enhance retention and reduce surfactant-related irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If detersive surfactants are used to cleanse skin and hair, then cleaning effectiveness is improved, but deposition of lipophilic actives deteriorates
Solution Approach 1:
The patent introduces polymers (ampholytic polymer and anionic polymer) as intermediary substances that mediate between the detersive surfactant system and the lipophilic actives. These polymers create a deposition-enhancing matrix that allows lipophilic materials to adhere to keratinous substrates even in the presence of cleansing surfactants, thus resolving the contradiction between cleaning effectiveness and active deposition.
Solution Approach 2:
The invention creates a composite deposition system combining multiple components: detersive surfactants for cleaning, ampholytic polymers for deposition enhancement, anionic polymers for stabilization, and lipophilic actives for beneficial effects. This composite formulation allows simultaneous achievement of cleaning effectiveness and active deposition by leveraging the synergistic interactions between components.
2Productivity
If detersive surfactants are used to remove sebum and environmental particulates, then cleansing performance is improved, but skin irritation worsens
Solution Approach 1:
The patent applies beforehand cushioning by incorporating polymers and conditioning agents into the formulation that preemptively protect the skin and hair from the harsh effects of detersive surfactants. These protective components form a cushioning layer that reduces lipid removal and minimizes irritation while allowing effective cleansing to occur.
Solution Approach 2:
The invention converts the potentially harmful effect of surfactant-induced lipid removal into a benefit by simultaneously depositing lipophilic actives that replenish and protect the skin's lipid barrier. The harm of lipid removal is offset by the beneficial deposition of conditioning lipophilic materials, transforming the negative effect into a positive outcome.
3Productivity
If conventional rinse-off products are designed to cleanse, then cleaning function is improved, but active retention deteriorates
Solution Approach 1:
The patent applies preliminary action by incorporating deposition-enhancing polymers into the rinse-off formulation before application. These polymers are pre-positioned to facilitate active deposition during the rinsing process itself, rather than requiring a separate conditioning step. The polymers are already in place to capture and retain lipophilic actives on the substrate as the product is rinsed off.
Solution Approach 2:
The invention introduces dynamic behavior to the rinse-off system by using polymers that change their conformation and binding properties during the rinsing process. The polymers dynamically adjust to the changing conditions (wet/dry, rinsing flow) to maximize active deposition and retention, transforming the traditionally passive rinse-off process into an active 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 higher deposition of lipophilic materials onto keratinous surfaces, reducing the negative impacts of harsh surfactants and improving skin and hair health by effectively retaining beneficial actives during use.
Implementation Method 1
a) from about 0.03 to about 2 wt. % of at least one ampholytic polymer; b) from about 0.01 to about 2 wt. % of at least one anionic polymer; c) from about 0.01 wt. % to about 45 wt. % of at least one lipophilic material that is deposited onto the keratinous substrate
Implementation Method 2
the weight ratio of ampholytic polymer to anionic polymer is from about 10:1 to about 1:1
Data Source
AI summary
The present technology relates to compositions suitable for depositing personal care actives onto keratinous substrates. More particularly, the technology concerns compositions comprising lipophilic materials which are deposited from an ampholytic-anionic delivery system. The compositions exhibit high deposition of the lipophilic material onto keratinous substrates such as the skin, nails, and/or hair upon application thereto. In one aspect, the disclosed technology relates to a personal care deposition composition for depositing a lipophilic material onto a keratinous substrate comprising: a) at least one ampholytic polymer; b) at least one anionic polymer; c) at least one lipophilic material; and d) water, wherein the weight ratio of the at least one ampholytic polymer to the at least one anionic polymer ranges from about 10:1 to about 1:1.