Keratin Fiber Styling Agent with Amphiphilic Cationic Polymer System
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Solution Overview
Problem
Current styling agents for keratin-containing fibers face challenges in achieving a balance between strong hold and easy, uniform application while maintaining hair health and appearance, particularly in providing a flexible film that does not break under stress and avoiding residue formation.
Innovation Solution
A combination of specific amphiphilic, cationic polymers, film-forming cationic polymers, and non-ionic polymers is used in a cosmetically acceptable carrier to create a formulation that provides a strong hold and excellent handleability, packaged as aerosol sprays or foams for effective hair styling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strong hold is achieved through high polymer concentration, then styling hold is improved, but application uniformity deteriorates due to increased viscosity and reduced handleability
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer system by combining cationic polymers with non-ionic film-forming polymers in specific ratios. This parameter change allows the formulation to maintain high hold strength while improving application uniformity, as the non-ionic polymer component reduces overall viscosity and enhances spreadability without sacrificing the binding strength provided by cationic polymers
Solution Approach 2:
The patent creates a composite polymer system combining cationic polymers (for hold) with non-ionic film-forming polymers (for application properties). This composite approach allows the formulation to exhibit both strong holding capability and improved handleability, as the two polymer types work synergistically to balance stylistic performance with application ease
2Stability of the object's composition
If film flexibility is improved to prevent breaking under stress, then hairstyle durability is improved, but hold strength may deteriorate due to reduced film rigidity
Solution Approach 1:
The patent adjusts the polymer composition parameters to achieve optimal film flexibility while maintaining hold strength. By selecting specific non-ionic polymers with appropriate molecular weights and combining them with cationic polymers in controlled ratios, the film achieves sufficient flexibility to prevent breaking under stress without sacrificing the binding strength needed for effective holding
Solution Approach 2:
The composite polymer system creates a film with balanced mechanical properties. The cationic polymer provides structural integrity and binding strength, while the non-ionic polymer contributes flexibility and elasticity. This composite structure allows the film to remain flexible enough to prevent breaking while maintaining sufficient hold strength through the synergistic interaction of the two polymer types
3Object-affected harmful factors
If natural hair appearance is maintained with low polymer amounts, then hair health is improved, but styling hold deteriorates due to insufficient film formation
Solution Approach 1:
The patent changes the efficiency parameters of the polymer system by selecting high-molecular-weight cationic polymers and optimizing their concentration in combination with non-ionic polymers. This allows effective film formation and strong holding at lower overall polymer concentrations, thereby maintaining natural hair appearance and promoting hair health while achieving sufficient styling hold through enhanced polymer effectiveness
Solution Approach 2:
The composite polymer system achieves high styling performance at low concentrations. The cationic polymer provides strong binding affinity to hair at low doses, while the non-ionic polymer enhances film formation efficiency. This synergistic composite allows effective styling hold and natural appearance to coexist, as the combined system maximizes the styling efficiency per unit of polymer applied
Data Source
AI summary
Agent for treating fibers containing keratin, in particular human hair, having in a cosmetically acceptable carrier, (a) at least one amphiphilic, cationic polymer comprising at least one structural unit of formulae (I) to (IV), wherein R1 and R4 are independently hydrogen or a methyl group; X1 and X2 are independently oxygen or a NH group; A1 and A2 are independently ethane-1,2-diyl, propane-1,3-diyl or butane-1,4-diyl; R2, R3, R5 and R6 are independently a (C1 to C4)-alkyl group; R7 is a (C8 to C30)-alkyl group; (b) at least one other film-forming cationic and/or stabilizing cationic polymer; and (c) at least one film-forming non-ionic and/or stabilizing non-ionic polymer. The invention also relates to the use of the agent for temporarily styling hair and for haircare, particularly as an aerosol hairspray or aerosol mousse.