Cationic Polygalactomannan for Split Ends Repair
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Solution Overview
Problem
Existing hair care compositions fail to effectively repair split ends and smooth lifted cuticle scales while maintaining hair health, as they often result in residual powders, greasiness, or stickiness, and do not provide durable curl retention and color protection.
Innovation Solution
A cationic polygalactomannan with non-ionic hydroxyalkyl substituents and specific viscosity, ranging from 700 to 1200 mPa.s, is used in hair care compositions for split ends mending and curl retention, which provides perceivable and durable repair without adverse effects like residual powders or greasiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cationic polymers with high charge density and high molecular weight are used, then split ends mending and cuticle repair are achieved, but dry hair negatives such as greasy appearance, sticky feel, loss of gloss and heavy coated feel occur
Solution Approach 1:
The patent modifies the molecular weight parameter of the cationic polymer to a specific range (50,000-2,000,000 g/mol) and adjusts the charge density through controlled quaternization degree (0.1-1.0), optimizing the balance between repair effectiveness and avoiding adverse sensory effects on hair
Solution Approach 2:
The invention creates a composite structure by combining cationic polygalactomannan with non-ionic hydroxyalkyl substituents, where the non-ionic groups provide steric stabilization and reduce intermolecular aggregation, thereby preventing the greasy and sticky effects while maintaining the cationic groups' ability to bind to damaged hair
2Reliability
If polyelectrolyte complexes are used for split ends repair, then repair effectiveness is improved, but stability is compromised when other ingredients are added to the formulation
Solution Approach 1:
The patent extracts the essential repair function into a single cationic polymer component that can independently bind to anionic sites on damaged hair, eliminating the need for complex polyelectrolyte complexes and their associated stability issues with formulation ingredients
Solution Approach 2:
The invention optimizes the molecular weight and charge density parameters of the cationic polymer to achieve effective hair binding without requiring complex interactions, thereby maintaining formulation stability even when other ingredients are present
3Reliability
If charged compounds and polymers are added to hair care formulation, then split ends mending is enhanced, but the structure of polyelectrolyte complexes is disrupted
Solution Approach 1:
The patent isolates the split ends mending function into a single cationic polymer that does not rely on complex interactions with other charged compounds, allowing the inclusion of multiple formulation ingredients without disrupting the repair mechanism
Solution Approach 2:
The cationic polygalactomannan acts as an intermediary that bridges the gap between formulation stability and repair effectiveness, providing a stable platform that can interact with hair damage without being disrupted by other formulation components
Data Source
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Figure 2~2b
Figure 3~4
AI summary
The invention relates to a method for mending split ends of hair comprising contacting the hair with split ends with a composition comprising at least cationic polygalactomannan containing non-ionic hydroxyalkyl substituents and having a Brookfield RVT viscosity at 25°C and 20 rpm greater than 700 mPa.s, at a concentration of 1 pbw in water, for instance comprised between 700 and 1,200 mPa.s.