Modified Dextran Polymer Enhances Silicone Deposition in Shampoo
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Solution Overview
Problem
Conventional shampoo formulations face challenges in efficiently depositing silicones onto hair while maintaining foam and lather quality, and they often remove both desirable and undesirable materials, leading to dryness and damage.
Innovation Solution
A shampoo formulation incorporating a modified carbohydrate polymer, specifically a dextran base polymer functionalized with quaternary ammonium groups and hydrophobic substituents, enhances silicone deposition onto hair, improving efficiency and reducing the need for high active levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional deposition aids (e.g., polyquaternium-10, guar hydroxypropyltrimonium chloride) are used to deposit silicone onto hair, then deposition efficiency is achieved, but high active levels are required which detrimentally affect foam/lathery consumer feel and increase cost
Solution Approach 1:
The patent changes the chemical structure parameters of the deposition aid by using a dextran base polymer with specific molecular weight (10,000-1,000,000 Daltons) and specific functionalization (quaternary ammonium groups and hydrophobic substituents), which improves deposition efficiency while allowing lower active levels that preserve foam quality
Solution Approach 2:
The patent creates a composite deposition aid by combining a dextran base polymer with quaternary ammonium groups and hydrophobic substituents, achieving both effective silicone deposition and maintenance of foam/lathery consumer feel at lower active levels
2Reliability
If high active levels of deposition aid are incorporated to achieve desired silicone deposition, then deposition efficiency improves, but foam/lathery consumer feel deteriorates and cost increases
Solution Approach 1:
The patent optimizes the molecular weight parameter of the dextran base polymer (10,000-1,000,000 Daltons) and the degree of functionalization to achieve high deposition efficiency at lower active levels, reducing the quantity of substance required in the formulation
3Reliability
If cleansing formulations use strong surfactants to remove undesirable materials from hair, then cleaning effectiveness improves, but desirable oils are removed leading to dryness and damage
Solution Approach 1:
The patent uses the modified dextran polymer as an intermediary that facilitates silicone deposition onto hair, allowing the silicone to replace oils removed during cleansing, thereby preventing dryness and damage while maintaining cleaning effectiveness
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 dextran polymer enhances silicone deposition, maintaining hair moisture and improving the consumer feel of the shampoo by reducing the detrimental effects on foam and lather quality.
Implementation Method 1
a deposition aid polymer, wherein the deposition aid polymer is a modified carbohydrate polymer, comprising a dextran base polymer functionalized with (i) quaternary ammonium groups
Implementation Method 2
hydrophobic substituents of formula (III) bound to a pendent oxygen on the dextran base polymer
Data Source
AI summary
A shampoo formulation is provided, comprising: dermatologically acceptable vehicle; dermatologically acceptable silicone; a dermatologically acceptable hair cleaning surfactant; a deposition aid polymer, wherein the deposition aid polymer is a modified carbohydrate polymer, comprising a dextran base polymer functionalized with (i) quaternary ammonium groups of formula (II) bound to a pendent oxygen on the dextran base polymer (II) wherein is a pendent oxygen on the dextran base polymer, wherein X is a divalent linking group; wherein each R2 is independently selected from a C1-4 alkyl group; and wherein R3 is a linear or branched C1-16 alkyl group; and (ii) hydrophobic substituents of formula (III) bound to a pendent oxygen on the dextran base polymer (III) wherein is a pendent oxygen on the dextran base polymer; wherein Z is a divalent linking group; wherein a is 0 or 1; and wherein each R5 is a linear or branched C6-22 alkyl group.