Hydrophobic-Ionic Polymer Composition for Humidity-Resistant Hair Styling
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Solution Overview
Problem
Conventional hair styling methods fail to maintain hair settings under high-humidity conditions due to insufficient impact resistance and retentiveness of the coating films.
Innovation Solution
A cosmetic composition comprising a hydrophobic polymer with a glass transition temperature of 30°C or higher, a hydrophilic ionic polymer, and an ionic polymer with a different charge, forming a layer-separation structure with crosslinked interactions to enhance hygroscopic resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating film is made firm to increase styling property, then the styling property is improved, but the coating film becomes more likely to come off by impacts of contacting or the like of hairs
Solution Approach 1:
The patent uses a composite polymer system comprising a hydrophobic polymer (Components A and/or D) and a hydrophilic ionic polymer (Component B), where the two polymer types with different properties work together to form a coating film that is both firm and impact-resistant. The hydrophobic polymer provides structural strength while the hydrophilic polymer provides flexibility and adhesion, resolving the contradiction between firmness and retention.
Solution Approach 2:
The patent creates different functional zones within the coating film by using polymers with different glass transition temperatures. The hydrophobic polymer with high Tg (30°C or higher) provides rigid structural support in certain regions, while the hydrophilic polymer provides flexible, adhesive regions. This local differentiation of material properties allows the film to be both strong and resistant to impact-induced detachment.
2Strength
If a thick film or gel is formed to improve coating strength, then the styling property is improved, but the setting properties are lowered under high humidity conditions
Solution Approach 1:
The patent employs a composite system where the hydrophilic ionic polymer (Component B) interacts with ionic polymers of opposite charge (Component C) to create a crosslinked network structure. This network provides humidity resistance by creating a more compact, less water-permeable structure, while the hydrophobic polymer maintains the film's structural integrity. The synergistic interaction between hydrophobic and hydrophilic components resolves the contradiction between film strength and humidity resistance.
Solution Approach 2:
The patent changes the chemical and physical parameters of the coating film by introducing ionic interactions between Component B and Component C. The electrostatic attraction between oppositely charged ionic polymers creates crosslinks that reduce water penetration and maintain setting properties under high humidity, while the hydrophobic polymer's high glass transition temperature ensures the film remains structurally sound.
3Ease of operation
If a block polymer with different Tg units is used to improve styling property and flexibility, then the coating film flexibility is improved, but the setting properties are lowered under high humidity conditions
Solution Approach 1:
The patent uses a composite of hydrophobic and hydrophilic polymers where each component contributes specific properties. The hydrophobic polymer with high Tg provides structural stability and humidity resistance, while the hydrophilic polymer provides flexibility. The ionic crosslinking between Component B and Component C creates a network that locks in the flexible structure while preventing humidity-induced collapse, thus maintaining both flexibility and setting properties under high humidity.
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 provides excellent retentiveness and impact resistance of hair settings under high-humidity conditions, maintaining styling properties by preventing coating film breakage.
Implementation Method 1
by a hydrophobic polymer and a hydrophilic ionic polymer, in this order from the hair surface, in a layer-separation structure
Implementation Method 2
containing a hydrophobic polymer and a hydrophilic ionic polymer... an ionic polymer which has a different kind of an electric charge to that of the hydrophilic ionic polymer
Data Source
AI summary
The present invention relates to a cosmetic composition containing the following Components (A), (B), and (C): Component (A): a hydrophobic polymer which dissolves in ethanol at 25° C. in an amount of 1% by mass or more, and has a glass transition temperature Tg of 30° C. or higher, the polymer having the same electric charge as the following Component (B), or not having an electric charge; Component (B): a hydrophilic ionic polymer which dissolves in ethanol at 25° C. in an amount of 1% by mass or more; and Component (C): an ionic polymer which dissolves in ethanol at 25° C. in an amount of 1% by mass or more, the ionic polymer having a different kind of an electric charge to that of the Component (B). The cosmetic composition of the present invention can be suitably used in cosmetics for hair.