Amphiphilic Polymer Stabilizes Silicone Deposition
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Solution Overview
Problem
Existing detersive conditioning compositions for keratinous substrates face challenges in maintaining stable silicone deposition while providing desired rheological properties, as surfactants can interfere with silicone deposition and larger particle sizes are required for effective deposition, limiting the use of smaller silicone particles.
Innovation Solution
Incorporating a nonionic amphiphilic polymer into the composition, specifically formulated from a monomer mixture that includes vinyl amide, vinyl ester, polyunsaturated crosslinking monomers, and alkoxylated associative monomers, to create a yield stress fluid that stabilizes silicone particles and prevents loss during rinsing, regardless of silicone type or particle size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If detersive surfactants are used to stabilize silicone droplets in aqueous phase, then emulsion stability is improved, but silicone deposition is reduced due to surfactant interference
Solution Approach 1:
The patent introduces a specific polymer thickener as an intermediary substance that mediates between the detersive surfactant and silicone droplets. This polymer acts as a bridging agent that stabilizes the silicone-containing emulsion through thickening and yield stress development without interfering with the silicone deposition mechanism, thus resolving the contradiction between emulsion stability and silicone deposition.
Solution Approach 2:
The patent changes the rheological parameters of the formulation by adding a polymer thickener that provides yield stress and shear-thinning behavior. This parameter change allows the emulsion to remain stable during storage and application while facilitating silicone deposition during rinsing, overcoming the negative effect of detersive surfactants.
2Productivity
If larger particle size silicone is used, then deposition speed is improved, but emulsion stability deteriorates
Solution Approach 1:
The polymer thickener serves as an intermediary that stabilizes larger silicone particles in the aqueous phase. By providing yield stress and thickening effects, it prevents the settling and phase separation of larger particle size silicone, enabling the use of larger particles for faster deposition without compromising emulsion stability.
3Force
If rheology modifiers are added to thicken the composition, then viscosity is improved, but silicone deposition is reduced
Solution Approach 1:
The patent employs a specific polymer thickener that changes the rheological parameters of the formulation by introducing yield stress and shear-thinning behavior. This allows the composition to maintain high viscosity for stability during storage while exhibiting flow characteristics during application and rinsing that facilitate silicone deposition, thus resolving the contradiction between viscosity improvement and deposition reduction.
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 provides stable silicone deposition and improved rheological properties, ensuring effective conditioning without interference from surfactants, maintaining optimal yield stress and aesthetic appeal across a broad pH range.
Implementation Method 1
a nonionic amphiphilic polymer which mitigates the loss of silicone deposition on keratinous substrates
Implementation Method 2
the nonionic amphiphilic polymer stabilizes silicone particles and prevents loss during rinsing
Implementation Method 3
to create a yield stress fluid that stabilizes silicone particles
Implementation Method 4
provides desired rheological properties
Data Source
Figure 1
AI summary
A conditioning and cleansing composition comprising at least one detersive surfactant, a silicone conditioning agent and a nonionic, amphiphilic polymer that mitigates the loss silicone deposition on keratinous substrates is disclosed. The nonionic, amphiphilic polymer is prepared by polymerizing a monomer composition comprising: a) from about 55 to about 95 wt.% of at least one vinyl amide monomer (based on the weight of the total monomers present); b) from about 5 to about 45 wt.% of at least one vinyl ester of an aliphatic carboxylic acid containing an acyl moiety having 2 to 22 carbon atoms (based on the weight of the total monomers present); c) from about 0 to about 1 wt.% of at least one polyunsaturated crosslinking monomer containing at least two polymerizable ethylenically unsaturated moieties (based on the total dry weight of the polymer); d) from about 0 to about 10 wt.% of at least one C1-C22 alkyl (meth)acrylate (based on the weight of the total monomers present); e) from about 0 to about 10 wt.% of an alkoxylated associative monomer (based on the weight of the total monomers present); f) from about 0 to about 10 wt.% of an alkoxylated semi-hydrophobic monomer (based on the weight of the total monomers present); and g) from about 0 to about 5 wt.% of at least one vinyl ester of an aliphatic carboxylic acid containing an acyl moiety having 2 to 22 carbon atoms (based on the weight of the total monomers present) other than vinyl acetate.