Acidic Shampoo Anti-Settling Polymer Composition
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Solution Overview
Problem
Aqueous shampoo compositions face challenges in maintaining stability and visual appeal due to density mismatch and pH-related issues, where conventional anti-settling polymers fail to prevent settling of insoluble materials and reduce the deposition of cosmetic ingredients, compromising both stability and visual characteristics.
Innovation Solution
An acidic aqueous shampoo composition incorporating a specific anti-settling thickening polymer with a formulation of 40-74.5 wt% C1-4 alkyl acrylate, 20-50 wt% methacrylic acid, 0.3-5 wt% 2-acrylamido-2-methylpropane sulfonic acid, and 5-25 wt% specialized associated monomer, which maintains high transparency and prevents aggregation of suspended materials, ensuring improved visual appearance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional anti-settling polymers are used in acidic pH compositions, then the composition maintains acidic pH, but the polymers fail to prevent settling and reduce deposition of cosmetic ingredients
Solution Approach 1:
The patent changes the chemical parameters of the polymer by incorporating carboxylic acid groups that remain protonated at acidic pH, allowing the polymer to maintain its thickening and anti-settling properties in acidic conditions where conventional polymers fail. This parameter change enables the polymer to function reliably across the desired pH range while maintaining deposition effectiveness.
2Stability of the object's composition
If cosmetic ingredients are suspended in aqueous compositions, then visual product aesthetics and active effects are improved, but density mismatch causes creaming or settling
Solution Approach 1:
The patent introduces a polymer as an intermediary substance that mediates between the suspended cosmetic ingredients and the aqueous continuous phase. The polymer creates a network structure that traps suspended particles, preventing their movement due to density differences, thereby maintaining both compositional stability and visual appearance without requiring the suspended materials to match densities.
3Stability of the object's composition
If thickening polymers are added to aqueous compositions, then viscosity and stability are improved, but transparency and visual characteristics are reduced
Solution Approach 1:
The patent applies local quality by creating a polymer network structure that provides thickening and stability functions in specific regions throughout the composition, rather than requiring uniform high concentrations of polymer throughout. This localized networking approach maintains transparency in the bulk material while providing sufficient viscosity and stability where the polymer network is present.
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 composition achieves superior visual properties and maintains effective deposition of benefit agents while providing enhanced stability, preventing settling and creaming of insoluble ingredients, thus enhancing consumer appeal and product performance.
Implementation Method 1
hydrophobically modified alkali swellable emulsion (HASE) polymer as anti-settling thickening polymer
Implementation Method 2
comprising: (a) 40 to 74.5 wt% of structural units of C 1-4 alkyl acrylate; (b) 20 to 50 wt% of structural units of methacrylic acid; (c) 0.3 to 5 wt% of structural units of 2-acrylamido-2-methylpropane sulfonic acid; and (d) 5 to 25 wt% of structural units of a specialized associated monomer
Implementation Method 3
hydrophobically modified alkali swellable emulsion (HASE) polymer
Implementation Method 4
comprising: (a) 40 to 74.5 wt% of structural units of C 1-4 alkyl acrylate; (b) 20 to 50 wt% of structural units of methacrylic acid
Data Source
AI summary
An acidic aqueous shampoo composition, which comprises: (I) a cleansing surfactant selected from the group consisting of anionic surfactant, zwitterionic or amphoteric surfactant and nonionic surfactant; (II) an emulsified silicone, (III) an anti-settling, thickening polymer, wherein the anti-settling, thickening polymer, comprises: (a) 40 to 74.5 wt% of structural units of C1-4 alkyl acrylate; (b) 20 to 50 wt% of structural units of methacrylic acid; (c) 0.3 to < 5 wt% of structural units of 2-acrylamido-2-methylpropane sulfonic acid (AMPS); (d) 5 to 25 wt% of structural units of a specialized associated monomer having the following structure: wherein R1 is a linear saturated C10-24 alkyl group; wherein R2 is a hydrogen or a methyl group (preferably, wherein R2 is a methyl group); and wherein n is an average of 20 to 28; with the proviso that the structural units of the specialized associated monomer (d) are derived from one of (i) a single specialized associated monomer (preferably, a single specialized associated monomer wherein R1 is selected from the group consisting of a linear saturated C12 alkyl group, a linear saturated C18 alkyl group and a linear saturated C22 alkyl group; more preferably, a single specialized associated monomer wherein R1 is selected from the group consisting of a linear saturated C12 alkyl group and a linear saturated C18 alkyl group); (ii) two specialized associated monomers, wherein R1 is, respectively, a linear saturated C12 and a linear saturated C18 alkyl group; or (iii) two specialized associated monomers, wherein R1 is, respectively, a linear saturated C18 alkyl group and a linear saturated C22 alkyl group; (f) 0 to 2 wt% of structural units of multi-ethylenically unsaturated crosslinking monomer or chain transfer agent; and wherein the sum of the weight percentages of structural units (a)-(f) is equal to 100 wt% of the anti-settling, thickening polymer; and method of treating hair or scalp with such a composition.