Skin Emulsion Thickening via Formula I Compound
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Solution Overview
Problem
Existing skin emulsion compositions with high polymer content face issues of stickiness and insufficient thickening, making it difficult to achieve desired viscosity without compromising the feel of use.
Innovation Solution
Incorporating a compound represented by formula (I) into polyacrylic acid salts and alkyl-modified carboxy polymers in skin emulsion compositions, along with an oil content of 10% or more, to enhance thickening effect without excessive polymer addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high polymer content is added to enhance thickening effect, then viscosity is improved, but the preparation becomes sticky and the feeling of use is spoiled
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by introducing a specific ratio of carboxyl groups (0.1-10 mmol/g) and alkyl substituents with controlled carbon numbers (8-35). This structural parameter optimization allows achieving high viscosity (10,000 mPa·s or more) while preventing excessive stickiness by balancing polymer chain interactions and steric hindrance from alkyl groups.
Solution Approach 2:
The patent creates a composite polymer system combining polyacrylic acid backbone with grafted alkyl chains and carboxyl functional groups. This composite structure integrates the thickening capability of the polyacrylic acid framework with the spacing and solubility enhancement provided by the alkyl side chains, achieving optimized rheological properties without excessive stickiness.
2Strength
If conventional polymers (polyacrylic acids and alkyl-modified carboxy polymers) are used for thickening, then some viscosity is achieved, but the thickening effect is insufficient requiring increased polymer amounts
Solution Approach 1:
The patent optimizes key parameters including carboxyl group content (0.1-10 mmol/g), alkyl chain carbon number (8-35), and polymer concentration (0.01-5%). These parameter adjustments maximize the thickening efficiency per unit mass, achieving viscosity of 10,000 mPa·s or more with minimal polymer content (0.01-5%), thereby resolving the contradiction between thickening effect and polymer quantity.
3Adaptability or versatility
If electrolytes are added to the emulsion composition, then other functional properties are improved, but viscosity decreases due to polymer chain collapse
Solution Approach 1:
The patent designs a composite polymer structure with hydrophobic alkyl chains (8-35 carbons) grafted onto the polyacrylic acid backbone. This composite architecture provides electrostatic shielding and hydrophobic interactions that protect the polymer network from electrolyte-induced collapse, maintaining high viscosity (10,000 mPa·s or more) even in the presence of electrolytes while allowing other functional additives to be incorporated.
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
This approach significantly increases viscosity to 10,000 mPa·s or more, improving the thickening effect while maintaining a pleasant feel and suppressing syneresis, even in the presence of electrolytes.
Implementation Method 1
a compound represented by formula (I) wherein R1... can increase the thickening effect produced by the polyacrylic acid salt and the alkyl-modified carboxy polymer
Implementation Method 2
applying a compound represented by formula (I) described below to a polyacrylic acid salt and an alkyl-modified carboxy polymer can increase the thickening effect
Implementation Method 3
an alkyl-modified carboxy polymer... suppressing syneresis, even in the presence of electrolytes
Implementation Method 4
Polymers have particular features, such as thickening, dispersion stability, emulsion stability, film formation, and solubilization
Data Source
Figure 1
AI summary
A major object of the present invention is to provide a skin emulsion composition comprising at least one member selected from the group consisting of polyacrylic acids and salts thereof, an alkyl-modified carboxy polymer, and a compound represented by formula (I) wherein R1, R2, and R3 are the same or different and represent C1-3 alkyl or C1-3 alkyl substituted with at least one hydroxyl group, with the proviso that at least one of R1, R2, and R3 is C1-3 alkyl substituted with at least one hydroxyl group, with the viscosity of the composition being 10,000 mPa·s or more.