Anti-Dandruff Composition Using Cationic Copolymer Deposition
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Solution Overview
Problem
Existing anti-dandruff products do not provide sufficient deposition of anti-dandruff agents onto the scalp, as they do not strongly adhere and are easily rinsed away during hair wash, leading to reduced efficacy.
Innovation Solution
Incorporating a copolymer comprising acrylamidopropyltrimonium chloride in hair care compositions, particularly in a weight ratio of 1:5 to 1:1 with anti-dandruff agents like piroctone olamine, enhances the deposition of these agents on the scalp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional cationic deposition polymers such as cationic guar polymers are used, then deposition of conditioning agents is enhanced, but deposition of anti-dandruff agents is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the polymer by selecting copolymers comprising acrylamidopropyltrimonium chloride with specific cationic charge densities (1.0 to 3.0 meq/g) and molecular weights (100,000 to 3,000,000 g/mol). This parameter optimization enables the polymer to effectively carry anti-dandruff agents onto the scalp and maintain their adherence, resolving the insufficient deposition issue while maintaining reliability.
Solution Approach 2:
The patent creates a composite system by combining the copolymer comprising acrylamidopropyltrimonium chloride with anti-dandruff agents in specific weight ratios (1:5 to 1:1). This composite approach allows the polymer to serve as an effective carrier that enhances both the deposition quantity and adherence reliability of the anti-dandruff agents on the scalp.
2Reliability
If anti-dandruff agents are applied to scalp, then anti-dandruff activity is provided, but agents are easily rinsed away during hair wash
Solution Approach 1:
The copolymer comprising acrylamidopropyltrimonium chloride acts as an intermediary carrier between the anti-dandruff agents and the scalp. The polymer's cationic charges bind to the anti-dandruff agents and facilitate their deposition onto the negatively charged scalp surface. This intermediary mechanism protects the agents from being easily rinsed away, thereby extending their duration of action and maintaining anti-dandruff efficacy.
3Quantity of substance
If copolymer comprising acrylamidopropyltrimonium chloride is used, then deposition of anti-dandruff agents is enhanced, but formulation complexity increases
Solution Approach 1:
The copolymer comprising acrylamidopropyltrimonium chloride serves multiple functions within the formulation: it acts as a deposition enhancer, a scalp-conditioning agent, and an anti-dandruff agent carrier. This multi-functionality reduces the need for separate ingredients, thereby managing formulation complexity while achieving enhanced deposition of anti-dandruff agents.
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 copolymer significantly improves the adherence and deposition of anti-dandruff agents, resulting in enhanced anti-dandruff efficacy by ensuring they remain on the scalp during and after washing.
Implementation Method 1
Cationic polymers are often used to enhance the deposition of conditioning agents and/or anti-dandruff agents onto the hair and/or scalp
Data Source
AI summary
A hair care composition is disclosed comprising an anti-dandruff agent selected from piroctone olamine, selenium sulfide and mixtures thereof and a copolymer comprising acrylamidopropyltrimonium chloride, wherein the weight ratio of the amount of the copolymer to the amount of the anti-dandruff agent is in the range of from 1:5 to 1:1.