Shampoo Cationic Polymer Blend for Conditioning and Sensory Balance
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Solution Overview
Problem
Many shampoo compositions fail to provide sufficient deposition of conditioning agents onto hair and skin during the cleansing process, leading to inadequate conditioning benefits, and cationic deposition polymers often result in undesirable hair feel after drying.
Innovation Solution
An aqueous shampoo composition containing anionic cleansing surfactants, discrete droplets of water-insoluble conditioning agents with a mean droplet diameter of 4 micrometres or less, and a combination of cationic polymers with specific charge densities, including cationically modified acrylamide and polygalactomannan polymers, to enhance conditioning benefits while minimizing greasy feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high charge density cationic polymers are combined with oily conditioning agents in shampoos, then wet conditioning benefits are improved, but dry hair sensory negatives such as heavy, greasy or coated feel occur
Solution Approach 1:
The patent applies parameter changes by carefully controlling the charge density of cationic polymers (specifically using polymers with charge density of 0.5-2.0 meq/g) and optimizing the concentration of oily conditioning agent (0.1-5.0% wt). This parameter optimization allows the formulation to achieve effective deposition and conditioning benefits while avoiding the greasy, heavy feel that occurs with higher charge density polymers
Solution Approach 2:
The patent uses composite materials by combining cationic polymers with specific charge densities alongside water-insoluble oily conditioning agents in a controlled emulsion system. This composite approach creates a synergistic effect where the cationic polymer facilitates deposition and the oily agent provides conditioning, while the specific formulation ratios prevent adverse sensory effects
2Quantity of substance
If cationic deposition polymers are used to improve deposition of conditioning agent, then deposition is improved, but balance of conditioning benefits at different stages of shampooing process becomes difficult to obtain
Solution Approach 1:
The patent applies local quality by differentiating the functional roles of different cationic polymer components based on their charge densities. Polymers with charge density 0.5-1.0 meq/g primarily facilitate deposition, while polymers with charge density 1.0-2.0 meq/g provide conditioning benefits during washing and rinsing. This functional differentiation within the polymer system allows simultaneous optimization of deposition and multi-stage conditioning performance
3Ease of operation
If conditioning agents are used in shampoo compositions, then conditioning benefits are provided, but large proportions of conditioning agent are rinsed away during cleansing process
Solution Approach 1:
The patent uses cationic polymers as intermediary carriers that facilitate the attachment of oily conditioning agents to the hair surface. The cationic polymers act as mediators between the anionic surfactant cleansing system and the hydrophobic conditioning agents, enabling effective deposition and retention of conditioning agents during the rinsing process through electrostatic interactions
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 improved wet conditioning benefits such as soft feel and combability while reducing dry hair sensory negatives like heaviness and greasiness, offering better hair management and sensory attributes.
Implementation Method 1
shampoo compositions comprising various combinations of cleansing surfactant and conditioning agents... anionic cleansing surfactant in combination with a conditioning agent... cationic deposition polymers
Implementation Method 2
oily materials such as mineral oils, naturally occurring oils such as triglycerides and silicone polymers. These are generally present in the shampoo as dispersed hydrophobic emulsion droplets
Data Source
AI summary
The invention provides an aqueous shampoo composition comprising: (i) one or more anionic cleansing surfactants; (ii) preferably, discrete, dispersed droplets of a water-insoluble conditioning agent with a mean droplet diameter (D3,2) of 4 micrometers or less; (iii) one or more cationic polymers (A) selected from cationically modified acrylamide polymers having a cationic charge density at pH7 of less than 1.0 meq per gram, cationically modified celluloses and mixtures thereof, and (iv) one or more cationic polymers (B) selected from cationically modified acrylamide polymers having a cationic charge density at pH7 of greater than 1.0 meq per gram, cationically modified polygalactomannans, and mixtures thereof, wherein the composition comprises a cationic polymer other than a cationically modified acrylamide polymer.