Acne Care Composition With Shear-Thinning Paste Rheology
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Solution Overview
Problem
Current acne skincare products are difficult to spread, prone to dripping on acne-prone areas, and challenging to remove reliably after application, compromising effective delivery of active ingredients.
Innovation Solution
A composition comprising sodium cocoyl isethionate, glycolipids, beta hydroxy acid, clay, and a cosmetically acceptable solvent, with a paste-like texture that exhibits peak shear stress followed by a sharp viscosity drop, ensuring easy application and retention without dripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acne care products are formulated with active ingredients, then therapeutic benefit is improved, but application difficulty and retention reliability deteriorate
Solution Approach 1:
The patent modifies the rheological parameters of the product by incorporating shear-thinning polymers and specific thickening agents, transforming the product from a simple liquid into a structured paste that exhibits shear-dependent viscosity. This allows the product to maintain high viscosity at rest (preventing drip) while becoming easily spreadable under application shear stress
Solution Approach 2:
The invention creates a composite formulation combining multiple functional components: active acne treatment ingredients, shear-thinning polymers, thickening agents, and emollients. This composite structure integrates the therapeutic function with improved rheological properties, achieving both therapeutic benefit and easy application without compromise
2Reliability
If product viscosity is increased to prevent dripping, then retention reliability is improved, but spreadability deteriorates
Solution Approach 1:
The patent employs dynamic rheology by incorporating shear-thinning polymers that change their viscosity response based on applied stress. The product exhibits high viscosity under static conditions (preventing drip) but undergoes viscosity reduction under shear stress during application, enabling easy spreading. This dynamic behavior is achieved through polymers like carbomers and hydroxyethylcellulose that display shear-thinning characteristics
Solution Approach 2:
The formulation utilizes materials that exhibit non-Newtonian flow behavior, specifically shear-thinning properties. The viscosity parameter is made dynamic rather than constant, allowing it to adapt to different operational states: high viscosity at rest for retention, low viscosity under shear for spreadability. This parameter transformation resolves the contradiction between retention and application ease
3Reliability
If product structure is strengthened to maintain paste texture, then retention is improved, but removal difficulty increases
Solution Approach 1:
The patent incorporates water-soluble polymers and thickening agents that create a reversible gel structure. This gel phase provides the necessary structure for retention and paste texture maintenance, but the gel network can be disrupted and transitioned to a sol state through contact with water during removal. This phase transition capability allows the product to maintain structure during application while enabling easy water-based removal
Solution Approach 2:
The invention uses water-soluble polymers as intermediary substances that create a temporary structured network on the skin. This intermediary gel structure provides retention and texture during the treatment period, but can be easily disrupted by water (the removal medium). The intermediary structure acts as a temporary scaffold that fulfills retention requirements without creating permanent adhesion barriers
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 easy spreadability and reliable retention on the skin, allowing for effective delivery of active ingredients without dripping, facilitating easy removal.
Implementation Method 1
the acne care composition demonstrates peak shear stress in a range from about 100 to about 1000 PA at shear rate in the range from 1 1/s-100 1/s, followed by a sharp drop in viscosity when shear stress is maintained
Data Source
AI summary
An acne care composition includes at least one surfactant comprising sodium cocoyl isethionate and optionally glyceryl stearate SE, at least one glycolipid, at least one beta hydroxy acid comprising salicylic acid or a derivative thereof, at least one clay optionally comprising kaolin, at least one cationic polymer optionally comprising chitosan, at least one thickener comprising one of carrageenan, xanthan gum, sclerotium gum, or a combination thereof, at least one cosmetically acceptable solvent comprising water, and comprising glycerin, and at least one additive selected from the group consisting of sodium hydroxide, niacinamide, lactic acid, cetyl alcohol, trisodium ethylenediamine disuccinate, ceramides, and combinations thereof. When applied to skin by rubbing, the composition demonstrates peak shear stress in a range from about 100 to about 1000 PA at shear rate in the range from 1 1/s-100 1/s, followed by a sharp drop in viscosity when shear stress is maintained.