Translucent Hair Conditioning Composition via Refractive Index Matching
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Solution Overview
Problem
Existing hair conditioning compositions fail to provide both translucent appearance and effective conditioning benefits, especially on wet hair, and often suffer from issues of spreadability and stability.
Innovation Solution
A hair conditioning composition comprising a cationic surfactant, a high melting point fatty compound, and a material with a refractive index of 1.30 to 1.70, combined with an aqueous carrier, which provides a transmittance of at least 0.5% and optimal shear stress for spreadability, while being substantially free of low melting point fatty compounds and non-silicone thickening polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conditioning agents (cationic surfactants, polymers, high melting point fatty compounds) are used to provide conditioning benefits, then hair conditioning performance is improved, but the composition becomes opaque and loses translucent appearance
Solution Approach 1:
The patent changes the physical-chemical parameters of the formulation by selecting specific materials with appropriate refractive indices (1.30-1.70) and using a balanced combination of cationic surfactant (0.1-5 wt%), high melting point fatty compound (0.1-5 wt%), and polyol (5-30 wt%). This parameter optimization allows the composition to maintain both conditioning efficacy and translucent appearance with transmittance of at least 0.5%
Solution Approach 2:
The patent creates a composite formulation combining multiple conditioning agents (cationic surfactant, high melting point fatty compound, polyol) in specific proportions. This composite approach allows the materials to work synergistically, where the polyol acts as a refractive index matcher and the balanced composition prevents phase separation, achieving both translucency and conditioning performance
2Ease of operation
If the composition includes high melting point fatty compounds and cationic surfactants for conditioning, then spreadability on hair is improved, but the composition may suffer from phase separation and reduced stability
Solution Approach 1:
The patent optimizes the concentration parameters of key ingredients, specifically maintaining cationic surfactant at 0.1-5 wt%, high melting point fatty compound at 0.1-5 wt%, and polyol at 5-30 wt%. This balanced parameter range ensures adequate spreadability while preventing phase separation by keeping the formulation within stable compositional boundaries
Solution Approach 2:
The patent introduces polyol as an intermediary substance with refractive index 1.30-1.70 that mediates between the cationic surfactant and high melting point fatty compound. The polyol acts as a compatibilizer that prevents phase separation while maintaining the spreadability provided by the other ingredients, achieving stability without sacrificing ease of application
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 achieves a translucent appearance and enhanced conditioning benefits, including improved spreadability and stability, particularly on wet hair, while maintaining a balanced formulation that avoids phase separation and ensures ease of application.
Implementation Method 1
a material having a refractive index of from about 1.30 to about 1.70; wherein the composition has a transmittance of at least about 0.5%
Data Source
AI summary
Disclosed is a hair conditioning composition comprising: a cationic surfactant; a high melting point fatty compound having a melting point of 25° C. or higher; a material having a refractive index of from about 1.30 to about 1.70; and an aqueous carrier, wherein a composition has a transmittance of at least about 0.5%. The composition is further specified by either: (i) the material is a polyol having at least 3 hydroxyl groups and the polyol is contained at a level of above 30% to about 80% by weight of the composition; or (ii) the cationic surfactant is a salt of a mono-long alkyl amine and an acid. The compositions provides both translucent appearance and conditioning benefits, especially conditioning benefit on wet hair when used as a rinse-off conditioner and/or spreadability on hair.