Quaternary Ammonium Siloxane Composition With Low Viscosity
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Solution Overview
Problem
Existing silicone quats for hair care lack a straightforward method for producing low viscosity polyorganosiloxanes with quaternary ammonium groups, which complicates the incorporation of hydrophilicity-improving substituents like polyethers, and prior art does not provide a composition comprising a mixture of such polymers with ester-functionalized siloxanes.
Innovation Solution
A composition comprising a linear polyorganosiloxane A with quaternary ammonium groups and terminal ester groups, along with a second polyorganosiloxane B without quaternary ammonium groups, is developed, where the polyorganosiloxane A is synthesized using a process involving a reaction of a diamine, a diepoxide, and a monofunctional organic acid, resulting in a low viscosity mixture that simplifies the system by reducing the need for additional hydrophilicity-improving agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polyethers are incorporated into silicone quats to increase hydrophilicity, then hydrophilicity is improved, but the system complexity increases and viscosity control becomes difficult
Solution Approach 1:
The patent combines polyether moieties and quaternary ammonium groups within the same polyorganosiloxane molecule, creating an integrated structure that provides both hydrophilicity and cationic functionality without requiring separate components. This merging eliminates the need for complex blends of multiple polymers while achieving the desired hydrophilic properties.
Solution Approach 2:
The polyorganosiloxane is designed to perform multiple functions simultaneously: the polyether moieties provide hydrophilicity and water solubility, while the quaternary ammonium groups provide cationic conditioning properties. This multi-functional design simplifies the overall system by eliminating the need for separate hydrophilizing agents and conditioning agents.
2Reliability
If high molecular weight silicone quats are used to improve wash-off resistance, then substantivity is improved, but viscosity increases and dispersion becomes difficult
Solution Approach 1:
The patent carefully controls the molecular weight and structural parameters of the polyorganosiloxane to achieve an optimal balance between wash-off resistance and viscosity. By adjusting the chain length, polyether content, and quaternary ammonium group density, the invention maintains low viscosity while preserving substantivity, enabling easy dispersion without requiring excessive shear force.
3Adaptability or versatility
If polyether moieties are added to improve hydrophilicity, then water solubility is improved, but the need for additional hydrophilicity-improving agents becomes redundant only if viscosity is controlled
Solution Approach 1:
The invention integrates the hydrophilic polyether functionality directly into the polyorganosiloxane backbone, eliminating the need for separate hydrophilizing agents. The polyether moieties are covalently bonded to the siloxane chain, creating a single-component system that provides both structural integrity and water solubility without requiring additional additives.
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 resulting composition achieves improved wash-off resistance and compatibility with surfactants, while maintaining low viscosity, allowing for easier dispersion in water and enhanced performance in cosmetic and textile applications.
Implementation Method 1
the reaction of a diamine, a diepoxide, and a monofunctional organic acid
Data Source
AI summary
Low viscosity polyorganosiloxanes comprising a) at least one polyorganosiloxane group, b) at least one quaternary ammonium group, c) at least one terminal ester group, methods of the manufacture thereof and their use for the modification of surfaces of substrates.