HLB-Controlled Polyglyceryl Ester Emulsion for Non-Sticky Peeling Agents
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Solution Overview
Problem
Cosmetic and dermatological compositions containing peeling agents often become sticky or greasy upon application, and are unstable over time and under temperature changes.
Innovation Solution
A non-sticky, smooth, and stable O/W emulsion composition is developed, incorporating at least one oil, fatty alcohol, hydroxy acid, polyglyceryl fatty acid ester, thickener, powder, and water, with the HLB of the polyglyceryl fatty acid ester ranging between 8.0 and 11.5.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peeling agent is incorporated into an emulsion, then the cosmetic effect is improved, but the composition becomes sticky and greasy to the touch
Solution Approach 1:
The patent changes the HLB parameter of the polyglyceryl fatty acid ester to a specific range (8.0-11.5) to optimize the balance between hydrophilic and lipophilic properties. This parameter adjustment allows the emulsion to maintain stability while reducing the sticky and greasy feeling, resolving the contradiction between cosmetic effectiveness and sensory comfort.
Solution Approach 2:
The patent uses a composite emulsion system combining multiple components: polyglyceryl fatty acid ester (with specific HLB), mineral oil, vegetable oil, fatty alcohol, and thickening agents. This composite formulation distributes the peeling agent within a balanced matrix that prevents excessive stickiness and greasiness while maintaining cosmetic efficacy.
2Reliability
If a peeling agent is incorporated into an emulsion, then the cosmetic effect is improved, but the composition becomes unstable over time and under temperature changes
Solution Approach 1:
The patent specifies precise HLB parameter ranges (8.0-11.5) for the polyglyceryl fatty acid ester to ensure optimal emulsion stability. This parameter control prevents phase separation over time and under temperature variations, allowing the peeling agent to remain effectively distributed throughout the emulsion matrix.
Solution Approach 2:
The polyglyceryl fatty acid ester acts as an intermediary surfactant that mediates between the hydrophilic and lipophilic components of the emulsion. This intermediary substance ensures stable dispersion of the peeling agent and maintains emulsion integrity under varying storage conditions, preventing degradation while preserving cosmetic effects.
3Stability of the object's composition
If the HLB of the polyglyceryl fatty acid ester is increased, then the emulsion stability is improved, but the sticky feeling increases
Solution Approach 1:
The patent identifies an optimal HLB parameter range (8.0-11.5) that balances two competing requirements: higher HLB improves emulsion stability by enhancing hydrophilic interaction, but excessively high HLB increases stickiness. By constraining the HLB within this specific range, the formulation achieves both stability and acceptable sensory properties.
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 provides a non-sticky, non-greasy feel on the skin and maintains stability over time and under temperature changes, even when containing a peeling agent, while also offering improved cosmetic effects such as skin tone improvements when including Vitamin B3 derivatives.
Implementation Method 1
the HLB of the (d) polyglyceryl fatty acid ester having a C6-C32 fatty acid residue or the weighted average of HLB values of the (d) polyglyceryl fatty acid esters having a C6-C32 fatty acid residue is between 8.0 and 11.5
Data Source
AI summary
An O/W emulsion contains: (a) at least one oil; (b) at least one fatty alcohol; (c) at least one acid selected from hydroxyl acids, phytic acid, and mixtures thereof; (d) at least one polyglyceryl fatty acid ester having a C6-C32 fatty acid residue; (e) at least one thickener; (f) at least one powder; and (g) water, wherein the HLB of the (d) polyglyceryl fatty acid ester having a C6-C32 fatty acid residue or the weighted average of HLB values of the (d) polyglyceryl fatty acid esters having a C6-C32 fatty acid residue is between 8.0 and 11.5. The composition includes the (c) acid, but it is stable and can provide no sticky feeling or a reduced sticky feeling as well as a non-greasy feeling or smooth feeling.