Polyion Complex Hair Composition for Moisture Resistance
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Solution Overview
Problem
Existing hair cosmetic compositions using polyion complexes suffer from poor stability, lack of durability after washing, and inadequate moisture resistance, especially under high humidity conditions.
Innovation Solution
A cosmetic composition comprising a cationic polymer with high viscosity, an anionic polymer, modified silicones, dimethylpolysiloxane, a cationic surfactant, and a higher alcohol, with a mass ratio of the cationic polymer to the anionic polymer of 4.5 or more, which forms a stable polyion complex that improves texture, durability, and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing hair cosmetic compositions using polyion complexes are used, then hair treatment effects are provided, but stability is poor and durability after washing is lacking
Solution Approach 1:
The patent changes the molecular weight parameters of the polymers used in the polyion complex. Specifically, it uses an anionic polymer with weight average molecular weight of 4000-80000 and a cationic polymer with weight average molecular weight of 10000-50000, optimizing the molecular weight range to improve both stability and durability after washing while maintaining the desired hair treatment effects
Solution Approach 2:
The patent creates a composite material system by forming a polyion complex between specific anionic and cationic polymers in a controlled mass ratio (0.1-10, preferably 0.3-3). This composite structure with optimized component ratios provides enhanced stability and washing durability compared to individual polymers or unoptimized complexes
2Reliability
If existing hair cosmetic compositions are used, then some hair treatment effects are achieved, but moisture resistance under high humidity is inadequate
Solution Approach 1:
The patent optimizes the mass ratio parameters of the polymers in the polyion complex to achieve better moisture resistance. By controlling the mass ratio of anionic to cationic polymer within 0.1-10 (preferably 0.3-3) and using specific molecular weight ranges, the complex forms a more stable film on hair that resists moisture penetration under high humidity conditions
Solution Approach 2:
The patent enhances the local quality of the hair surface by forming a polyion complex film with specific compositional characteristics. The optimized polymer combination and ratio create a film with improved barrier properties at the hair surface, providing localized moisture resistance where it is most needed under high humidity conditions
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 significantly enhances the texture and durability of hair treatments, suppresses hair entanglement, maintains moisture resistance under high humidity, and exhibits improved stability over time.
Implementation Method 1
a complex formed by an interaction between the anionic polymer and the cationic polymer is related to the reason for the above-described effect
Data Source
AI summary
A cosmetic composition or a fiber treatment composition for head decoration products, the composition containing (A) a cationic polymer having a viscosity when in a 1 mass % aqueous solution form at 30° C. of 1000 mPa·s or more, (B) an anionic polymer, (C) one or more modified silicones selected from the group consisting of a polyglycerol-modified silicone and an amino-modified silicone, (D) a dimethylpolysiloxane, (E) a cationic surfactant, and (F) a higher alcohol, wherein a mass ratio [(A)/(B)] of the component (A) to the component (B) is 4.5 or more.