Cationic Anionic Polymer Hair Cosmetic for Wet Combability
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Solution Overview
Problem
Conventional hair cosmetics fail to adequately improve the feel and appearance of damaged hair, particularly in enhancing finger combability of wet hair and manageability of dried hair, and often lose effectiveness with repeated washing.
Innovation Solution
A hair cosmetic comprising a cationic polymer with a charge density of 5.0 meq/g to 7.0 meq/g and an anionic polymer comprising 80% to 100% of a specific constitutional unit, which are used in a two-part or three-part hair bleach or dye composition to improve hair durability and retention of conditioning effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conditioning components are applied to hair, then initial conditioning effect is achieved, but the effect is not retained after repeated washing
Solution Approach 1:
The patent applies parameter changes by specifying precise molecular weight ranges (10,000-100,000 for cationic polymer, 50,000-500,000 for anionic polymer) and charge density parameters to optimize the conditioning effect retention. This resolves the contradiction by finding the optimal parameter window where both initial effectiveness and long-term retention are achieved.
Solution Approach 2:
The patent uses composite materials by combining specific cationic polymers with specific anionic polymers in defined ratios. This composite approach creates a synergistic effect where the cationic polymer adsorbs onto damaged hair regions and the anionic polymer enhances retention, solving the problem of effect loss after repeated washing.
2Reliability
If hair bleach or dye compositions are used, then hair color treatment is achieved, but hair entanglement and deterioration in feel occur
Solution Approach 1:
The patent introduces polymer complexes as intermediaries between the harsh bleach/dye chemicals and the hair structure. These polymer complexes (formed by cationic and anionic polymers) act as protective mediators that reduce direct chemical damage and physical entanglement while allowing color treatment to proceed effectively.
Solution Approach 2:
The patent converts the potentially harmful interaction between oppositely charged polymers (which could cause precipitation) into a beneficial effect by controlling the molecular weights and charge densities to form stable, beneficial polymer complexes that condition and protect hair during chemical treatment.
3Ease of operation
If cationic and anionic polymers are combined to enhance hair gloss and softness, then conditioning effect is improved, but hair entanglement may occur during washing
Solution Approach 1:
The patent resolves this contradiction through precise parameter control: limiting cationic polymer molecular weight to 10,000-100,000 and anionic polymer to 50,000-500,000, and controlling charge densities. These parameter restrictions prevent excessive polymer-polymer interactions that would cause entanglement while maintaining sufficient conditioning effectiveness.
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 solution significantly enhances the feel and appearance of damaged hair by improving finger combability and manageability, maintaining these effects even after repeated washing, and providing long-lasting hair gloss and softness.
Implementation Method 1
a technique for increasing the adsorption amount of silicones by using a specific cationic polymer together with an amino-modified silicone and a highly polymerized silicone
Implementation Method 2
a hair cosmetic containing a specific cationic polymer and a specific anionic polymer can solve the above-described problems all at once
Data Source
AI summary
A hair cosmetic containing Components (A) and (B): (A) a cationic polymer having a charge density of 5.0 to 7.0 meq/g; and (B) an anionic polymer comprising 80% by mass or more and 100% by mass or less of a constitutional unit represented by Formula (1) and having a weight-average molecular weight of 4,000 or more and 80,000 or less, where R1 represents a hydrogen atom or a carboxy group; and R2 represents a hydrogen atom or a methyl group.