Cleansing Composition with Cationic Polymer for Slimy Feel Removal
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Solution Overview
Problem
Conventional skin cleansing compositions with polyoxyethylene alkyl ether sulfate as a main ingredient often retain a slimy feel during rinsing and fail to provide a strong stop feeling, leading to sticky skin and an unrefreshed touch.
Innovation Solution
A cleansing composition combining polyoxyethylene alkyl ether sulfate with a cationic group-containing polymer and cationized hydroxypropyl cellulose, which enhances lathering, quickly removes sliminess, and provides a strong stop feeling, resulting in a smooth, moist, and non-sticky skin after drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polyoxyethylene alkyl ether sulfate is used as a main ingredient in a skin cleansing composition, then good lathering ability is achieved, but a slimy feel remains during rinsing and the skin feels sticky after drying
Solution Approach 1:
The patent combines polyoxyethylene alkyl ether sulfate with cation group-containing polymers and cationized hydroxypropyl cellulose to create a composite cleansing system. This composite approach allows the anionic surfactant to provide lathering while the cationic polymers counteract the slimy feel through electrostatic interaction and film formation, resolving the contradiction between good lathering and eliminating slimy sensation
Solution Approach 2:
The patent specifies precise parameter ranges for the cation group-containing polymer (charge density of 4.5 to 7 meq/g, specific weight ratios relative to the surfactant) to optimize the balance between maintaining lathering ability and eliminating the slimy feel. By controlling these parameters, the composition achieves both good lathering and refreshed skin feel without stickiness
2Ease of operation
If a water-insoluble oil such as polyisobutene or silicone oil is added to improve rinse feeling, then lathering is enhanced, but a strong oily feeling remains on the skin after rinsing and the skin feels sticky
Solution Approach 1:
The patent replaces water-insoluble oils with water-soluble cation group-containing polymers having specific charge density parameters (4.5 to 7 meq/g). This parameter change in the conditioning agent's solubility and charge characteristics allows for improved rinse feeling without the persistent oily residue, as the cationic polymers are water-soluble and can be rinsed off cleanly while providing the desired stop feeling
Solution Approach 2:
The patent eliminates the use of water-insoluble oils that cause persistent oily feeling and replaces them with cationic polymers that can be effectively removed during rinsing. The cationic polymers provide temporary conditioning benefits during cleansing but are designed to be rinsed away, leaving no sticky residue, thus discarding the harmful oily feeling while recovering the beneficial rinse feel
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 high lathering, rapid disappearance of slimy feel during rinsing, and a strong stop feeling, offering a refreshing and protective skin feel post-cleansing.
Implementation Method 1
a cleansing composition comprising the following components (A), (B), (C), and (D): (A) from 1 to 20% by weight of a polyoxyethylene alkyl ether sulfate; (B) from 0.02 to 5% by weight of a cation group-containing polymer having a cationic charge density of from 4.5 to 7 meq/g
Data Source
AI summary
A cleansing composition comprising the following components (A), (B), (C) and (D):(A) from 1 to 20% by weight of a polyoxyethylene alkyl ether sulfate,(B) from 0.02 to 5% by weight of a cation group-containing polymer (B) having a cationic charge density of from 4.5 to 7 meq/g,(C) from 0.02 to 10% by weight of cationized hydroxypropyl cellulose (C) represented by the following formula (1)wherein R1, R2 and R3 each independently represent a substituent group having a cationized ethyleneoxy group and a propyleneoxy group, n represents a number of from 20 to 5000 which is a number representing the average polymerization degree of anhydroglucose, and the substitution degree of the cationized ethyleneoxy group is from 0.01 to 3 and the substitution degree of the propyleneoxy group is from 0.01 to 5, and(D) water.