Water-Based Polymer Composition for Hair Coacervate Formation
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Solution Overview
Problem
Existing hair-washing compositions do not effectively form coacervates to trap silicone and oil ingredients, resulting in inadequate conditioning effects.
Innovation Solution
A composition comprising an anionic surfactant, a cationic polymer, and a specific polymer containing a (meth)acrylic acid-derived structural unit, with a storage modulus of 10 to 1000 Pa, which forms coacervates with a rate of 2 mass% or more and a size of 0.1 to 30 µm when diluted with water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hair-washing compositions containing anionic surfactants and cationic polymers are used, then cleansing function is provided, but coacervate-forming ability is insufficient resulting in inadequate conditioning effect
Solution Approach 1:
The patent applies composite materials by formulating a composition containing anionic surfactant, cationic polymer, and polyacrylic acid in specific proportions. This composite system synergistically enhances coacervate-forming ability beyond what individual components can achieve alone, resolving the contradiction between adequate conditioning effect and sufficient coacervate yield.
Solution Approach 2:
The patent employs parameter changes by optimizing the concentration ranges of each component (anionic surfactant: 5-50 mass%, cationic polymer: 0.025-5 mass%, polyacrylic acid: 0.1-5 mass%) to maximize coacervate formation. By adjusting these compositional parameters, the invention achieves both high coacervate yield and effective conditioning.
2Stability of the object's composition
If polymer (c) with high storage modulus is used to enhance coacervate stability, then coacervate structure is improved, but composition complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying the storage modulus G' of polymer (c) within the range of 10 to 1000 Pa at 1 rad/s. This quantitative parameter control ensures coacervate structural stability without requiring complex compositional adjustments, as the polymer's rheological properties directly determine coacervate formation efficiency.
Solution Approach 2:
The patent uses polymer (c) as an intermediary component that mediates between the anionic surfactant and cationic polymer. This intermediary polymer facilitates coacervate formation and structural stabilization through its specific viscoelastic properties, simplifying the overall system design while achieving stable coacervate structures.
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 exhibits excellent coacervate-forming ability, enhancing the conditioning effect of hair-washing products.
Implementation Method 1
coacervates formed by these components play the role of trapping silicone and oil ingredients
Implementation Method 2
coacervates formed by these components [anionic surfactant and cationic polymer]}
Implementation Method 3
when diluted with water
Data Source
Figure 1~2
AI summary
The present disclosure provides a water-based composition that exhibits excellent coacervate-forming ability. Specifically, the present disclosure provides a composition comprising: (a) an anionic surfactant, 5 to 50 mass%; (b) a cationic polymer, 0.025 to 5 mass%; (c) a polymer containing a (meth)acrylic acid-derived structural unit, 0.1 to 5 mass%; and (d) water, 20 to 80 mass%, wherein the polymer (c) is defined as follows: (A): being at least one polymer selected from the group consisting of (A-1) and (A-2) below: (A-1) a copolymer obtained by polymerization of the following (i) and (ii); and (A-2) a copolymer obtained by polymerization of the following (i), (ii), and (iii): (i) (meth)acrylic acid, 100 parts by mass; (ii) a compound having two or more ethylenically unsaturated groups, 1 part by mass or less; and (iii) a (meth)acrylic acid alkyl ester in which the alkyl group has 10 to 30 carbon atoms, 5 parts by mass or less; and (B): having a storage modulus (G') of 10 to 1000 Pa at a frequency dispersion of 1 rad/s as measured under the following conditions: measurement conditions: for a neutralized aqueous solution having a degree of neutralization of 70% and containing 0.5% mass% of the polymer (c) based on the total amount of the neutralized aqueous solution, the storage modulus (G') at an angular frequency of 1 rad/s is determined based on frequency dispersion obtained by changing the angular frequency from 0.1 to 300 rad/s under conditions of a liquid temperature of 25°C and a strain of 0.1% or 1% in strain dispersion with a rheometer frequency set to 1 Hz.