Cationic Dextran Shampoo Formulation for Silicone Deposition

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Solution Overview

Problem

Existing shampoo formulations struggle with low efficiency in depositing silicone onto hair, leading to undesirable effects on foam/lathery consumer feel and increased active ingredient levels, while conventional deposition aids have a low natural origin index.

Innovation Solution

Incorporation of a cationic dextran polymer functionalized with quaternary ammonium groups, combined with sodium lauryl ether surfactants, to enhance silicone deposition on mammalian hair.

Engineering Contradictions & Design Principles

VSEngineering 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 the natural origin index is low and high active ingredient levels are required which detrimentally affect foam/lathery consumer feel

Engineering Contradiction:

Improvesilicone deposition efficiencyVSAvoidlow natural origin index and degraded consumer feel

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical structure parameters of the deposition aid by using cationic dextran with specific molecular weights (50,000 to 3,000,000 Daltons) and specific quaternary ammonium group configurations, which improves deposition efficiency while maintaining natural origin index and consumer feel

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite system combining cationic dextran polymer with specific quaternary ammonium groups (formula A) and sodium lauryl ether surfactants, where the synergistic interaction between components achieves enhanced deposition efficiency without requiring high active ingredient levels

Inventive Principle:

Principle #40Composite materials

2Reliability

If high levels of active ingredient (silicone) are incorporated into the shampoo formulation to achieve desired deposition results, then deposition efficiency is improved, but foam/lathery consumer feel is detrimentally affected and cost increases

Engineering Contradiction:

Improvesilicone deposition efficiencyVSAvoidactive ingredient level

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The cationic dextran polymer acts as an intermediary that facilitates the deposition of silicone onto hair by providing cationic sites that interact with the anionic silicone, thereby reducing the amount of active silicone ingredient needed while maintaining deposition efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If conventional cationic polymers are used as deposition aids, then deposition function is provided, but the natural origin index is low compared to the invention

Engineering Contradiction:

Improvedeposition functionVSAvoidlow natural origin index

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the origin parameter of the deposition aid by using dextran (a natural polysaccharide) instead of synthetic cationic polymers, thereby achieving the same deposition function while significantly improving the natural origin index of the formulation

Inventive Principle:

Principle #35Parameter changes

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

Enhances silicone deposition on hair, improving consumer feel and reducing the need for high active ingredient levels, while maintaining formulation properties.

Implementation Method 1

a deposition aid polymer, wherein the deposition aid polymer is a cationic dextran polymer, comprising a dextran polymer functionalized with quaternary ammonium groups

Methodology Applied

Scientific EffectElectrostatic interaction: Electrostatics

Implementation Method 2

Cleansing formulations typically include a surfactant to promote the removal of materials deposited on the hair

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Data Source

PatentUS12453689B2Shampoo formulation with enhanced silicone deposition

Publication Date: 2025.10.28 ROHM & HAAS CO

AI summary

A shampoo formulation is provided, comprising: dermatologically acceptable vehicle; dermatologically acceptable silicone; sodium lauryl ether surfactant, wherein the sodium lauryl ether surfactant is selected from sodium lauryl ether sulfate having an average two —(OCH2CH2)— groups per molecule, sodium lauryl ether sulfate having an average three —(OCH2CH2)— groups per molecule and mixtures thereof; deposition aid polymer, wherein the deposition aid polymer is cationic dextran polymer, comprising dextran polymer functionalized with quaternary ammonium groups; wherein the dextran polymer has weight average molecular weight of 50,000 to 3,000,000 Daltons; wherein quaternary ammonium groups are selected from quaternary ammonium moieties of formula (A) bound to pendent oxygen on dextran polymerwhereinis pendent oxygen on dextran polymer; wherein X is divalent linking group bonding quaternary ammonium moiety to pendent oxygen on dextran polymer; wherein each R2 is independently selected from C1-4 alkyl group; and wherein R3 is linear or branched C8-16 alkyl group.