Labile Cross-Linker Polymer for Viscosity Stability
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Solution Overview
Problem
Cosmetic and detergent compositions experience stability issues due to increased electrolyte content over time, leading to a decrease in viscosity, which is currently addressed by overdosing thickening polymers, a solution that is unsatisfactory.
Innovation Solution
A polymeric composition comprising cross-linked polymers with both labile and non-labile cross-linkers is used to maintain viscosity by compensating for the drop in viscosity caused by electrolyte increase, achieved through the degradation of labile cross-linkers, which maintains the volume fraction of hydrogels and thus the viscosity of the compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thickening polymers are used to stabilise cosmetic and detergent compositions, then viscosity is maintained initially, but viscosity drops over time due to electrolyte accumulation from secondary reactions
Solution Approach 1:
The patent applies dynamics by making the cross-linking density of the polymer adjustable over time through the use of labile cross-linkers that degrade under storage conditions. This allows the polymer network to dynamically adapt its structure in response to electrolyte accumulation, maintaining viscosity stability throughout the product shelf life rather than just initially.
Solution Approach 2:
The patent changes the parameter of cross-linking density over time by incorporating labile cross-linkers that progressively degrade during storage. This parameter change allows the polymer to compensate for viscosity loss caused by electrolyte accumulation, transforming the static polymer structure into a dynamic system that adapts to changing composition conditions.
2Stability of the object's composition
If manufacturers overdose cosmetic and detergent compositions with thickening polymers to compensate for viscosity loss, then viscosity stability is improved, but the quantity of polymer required increases leading to higher greenhouse gas emissions
Solution Approach 1:
Instead of increasing the quantity of polymer, the patent changes the parameter of cross-linking density over time through labile cross-linker degradation. This allows a smaller initial polymer dose to maintain viscosity stability throughout the product shelf life, reducing the total quantity of polymer needed and associated environmental impact.
Solution Approach 2:
The polymer system provides self-service by automatically adjusting its cross-linking density in response to electrolyte accumulation during storage. The labile cross-linkers degrade autonomously under storage conditions, allowing the polymer to self-regulate its viscosity-maintaining capability without requiring excessive initial dosing or external intervention.
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 solution significantly reduces the loss of viscosity over time, allowing for a constant viscosity to be maintained for at least a year, reducing the need for excessive thickening polymers and associated greenhouse gas emissions.
Implementation Method 1
achieved through the degradation of labile cross-linkers, which maintains the volume fraction of hydrogels and thus the viscosity of the compositions
Implementation Method 2
The stabilising property is provided by a compact stack of hydrated polymers (or hydrogels) thickening the aqueous phase of the cosmetic or detergent composition by a charge repulsion mechanism
Data Source
AI summary
A polymer composition for thickening a cosmetic or detergent composition, the polymer composition including either at least one polymer cross-linked with at least one labile cross-linker and at least one non-labile cross-linker, or at least two cross-linked polymers, at least one being cross-linked with at least one labile cross-linker and at least one being cross-linked with at least one non-labile cross-linker. The polymer composition makes it possible to maintain the viscosity of a cosmetic or detergent composition over time.