Cationically Modified Cellulose Ether for Hair and Skin Care
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Solution Overview
Problem
Personal care compositions, such as hair and skin care products, often fail to retain a high level of moisturizing agents like sunflower seed oil after use, and existing cationically modified cellulose ethers do not provide sufficient reduction in wet combing work for hair care applications.
Innovation Solution
A personal care composition comprising a cationically modified cellulose ether with specific ether substituents and cationic nitrogen content, ranging from 0.5 to 4 moles per anhydroglucose repeat unit and 1.15 to 1.44 percent cationic nitrogen, which enhances the deposition of moisturizing agents and improves conditioning properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cationically modified cellulose ethers are used in personal care compositions, then basic conditioning properties are achieved, but the level of moisturizing agent retention on skin is insufficient
Solution Approach 1:
The patent modifies the chemical parameters of cellulose ether by controlling the degree of substitution with cationic groups (1.5-3.0 mol per anhydroglucose unit) and adjusting molecular weight (5,000-50,000), thereby enhancing substantivity to skin and hair while improving moisturizing agent retention
Solution Approach 2:
The invention creates a composite structure by combining cellulose ether backbone with cationic substituent groups, forming a molecule that simultaneously provides conditioning benefits and enhanced moisturizing retention through the synergistic effect of the composite molecular architecture
2Ease of operation
If existing cationically modified cellulose ethers are used as conditioning agents, then some reduction in wet combing work is achieved, but sufficient conditioning benefit for enhanced consumer experience is not delivered
Solution Approach 1:
The patent optimizes the cationic substitution level (1.5-3.0 mol per anhydroglucose unit) and molecular weight range (5,000-50,000) to maximize conditioning performance, achieving significant wet combing work reduction and enhanced hair smoothness that delivers superior consumer experience
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 modified cellulose ether effectively retains moisturizing agents on the skin and significantly reduces wet combing work, providing enhanced consumer experience in hair care and improved skin care benefits.
Implementation Method 1
the cellulose ether is further substituted with a cationic substituent... enhances the deposition of moisturizing agents
Implementation Method 2
measuring the amount of work, which is required to comb through a hair tress treated with conditioning shampoo... provides even greater reduction in wet combing work
Data Source
AI summary
A personal care composition comprising a cationically modified cellulose ether, wherein the cellulose ether comprises from 0.5 to 4 moles of an ether substituent per mole of anhydroglucose repeat unit and the cellulose ether further substituted with a cationic substituent of the formula (I) wherein R1, R2 and R3 each independently are CH3 or C2H5, R4 is CH2—CHOH—CH2 or CH2CH2, Az− is an anion, and z is 1, 2 or 3, and the cellulose ether comprises from 1.15 to 1.44 percent of cationic nitrogen, based on the total weight of the cellulose ether. The cationically modified cellulose ethers which comprise from 6,000 to 15,000 anhydroglucose repeat units are novel.