Rinse-off Conditioner Microcapsule Deposition via Non-Quaternized Ingredients
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Solution Overview
Problem
Existing rinse-off conditioner compositions face challenges in maximizing the deposition of microcapsules on surfaces such as hair or skin, as the addition of cationic deposition aids does not fully optimize the retention of microcapsules post-rinsing, leading to suboptimal delivery of active ingredients like perfumes.
Innovation Solution
A rinse-off conditioner composition comprising core-shell microcapsules with an oil-based core and a polymeric shell coated with a cationic polymer, using a limited amount of quaternary ammonium salts and an optimized amount of non-quaternized conditioning ingredients, which enhances the deposition efficiency of microcapsules on surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If quaternary ammonium salts are used as cationic deposition aids to improve microcapsule deposition, then deposition efficiency is enhanced, but the amount of quaternary ammonium salts is limited to avoid excessive conditioning performance
Solution Approach 1:
The patent changes the chemical composition parameters by replacing quaternary ammonium salts with non-quaternized conditioning ingredients (fatty alcohols, fatty acids, fatty esters, fatty amides). This substitution maintains cationic character and deposition efficiency while controlling the quantity of traditional quaternary ammonium salts to below 2 wt%, thereby resolving the contradiction between achieving high deposition and limiting salt content.
2Reliability
If non-quaternized conditioning ingredients are added to maximize deposition, then microcapsule retention post-rinsing is improved, but the composition complexity increases
Solution Approach 1:
The patent creates a composite conditioning system combining non-quaternized ingredients (fatty alcohols, fatty acids, fatty esters, fatty amides) with the polymeric shell of microcapsules. These ingredients work synergistically to enhance microcapsule deposition and retention without requiring complex formulation structures, as the natural amphiphilic properties of these ingredients facilitate their function.
3Productivity
If cationic polymers are used to improve capsule deposition, then deposition performance is enhanced, but the amount of cationic polymers must be kept low to maintain rinse-off properties
Solution Approach 1:
The patent applies cationic character locally through the polymeric shell coating of microcapsules rather than through bulk cationic polymers. The shell is coated with cationic materials (polyethyleneimine, chitosan, or quaternized polymers) at controlled levels, providing localized positive charge for electrostatic attraction to negative hair surfaces while keeping overall polymer content low to maintain rinse-off behavior.
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 significantly improves the deposition efficiency of microcapsules, leading to a longer-lasting perception of fragrances and improved delivery of active ingredients by reducing the amount of quaternary ammonium salts and incorporating non-quaternized conditioning ingredients, resulting in higher retention post-rinsing.
Implementation Method 1
microcapsules having an oil-based core and a polymeric shell coated with at least a cationic polymer
Implementation Method 2
an optimized amount of non-quaternized conditioning ingredients, which maximize the deposition of microcapsules on a surface such as hair or skin
Data Source
AI summary
Described herein are rinse-off hair conditioner compositions with high deposition properties for cationically coated microcapsules. The compositions contain limited amounts of quaternary ammonium salts that are replaced by at least one non-quaternized conditioning ingredient to provide a high deposition of microcapsules onto a surface.