Shear-Thinning Scalp Care Composition for Active Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anti-dandruff leave-on treatments face challenges in achieving effective coverage and stability of particulate actives like sulfur and selenium disulfide, as compositions with low viscosity fail to retain actives on the scalp, while high viscosity compositions are difficult to spread and apply evenly.
Innovation Solution
A scalp care composition with a balanced rheological profile, comprising 1% to 99% volatile carrier, 0.05% to 10% polymeric rheology modifier, and 0.03% to 1% particulate scalp benefit agent, exhibiting shear thinning properties with specific viscosity values at different stress levels to ensure stable suspension and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If low viscosity composition is used, then easy application and spread is achieved, but active retention on scalp is poor causing dripping and running
Solution Approach 1:
The patent applies parameter changes by optimizing the rheological profile through specific viscosity values at different stress levels. The composition is formulated to have viscosity of 50-5000 cP at 0.1 Pa/s, 10-1000 cP at 10 Pa/s, and 1-100 cP at 100 Pa/s, creating a shear-thinning behavior that provides easy application when spread and reliable retention when at rest
Solution Approach 2:
The patent implements dynamics by creating a non-Newtonian fluid with shear-thinning properties. The viscosity dynamically adjusts based on applied stress: high viscosity at low stress prevents dripping and maintains active retention on scalp, while low viscosity under high shear rate enables easy spreading and application during consumer use
2Reliability
If high viscosity composition is used, then active stability and retention is improved, but application difficulty and spreadability deteriorate
Solution Approach 1:
The patent resolves this contradiction by establishing specific viscosity parameter ranges at multiple stress levels. The composition maintains viscosity of 50-5000 cP at 0.1 Pa/s for stability, while ensuring viscosity drops to 1-100 cP at 100 Pa/s for easy spreadability during application, achieving both active retention and consumer ease of use
3Stability of the object's composition
If high level of rheological modifiers is used, then active suspension stability is achieved, but composition becomes difficult to manipulate and apply
Solution Approach 1:
The patent applies parameter changes by controlling the rheological profile through specific viscosity measurements at different shear rates rather than simply increasing rheological modifier concentration. The formulation achieves active suspension stability with viscosity of 50-5000 cP at 0.1 Pa/s while maintaining manipulability through shear-thinning to 1-100 cP at 100 Pa/s
Solution Approach 2:
The patent implements dynamics by formulating a shear-thinning composition where the rheological properties dynamically respond to applied stress. The non-Newtonian behavior allows the composition to maintain high viscosity at rest for stable active suspension, then transition to low viscosity under application stress for easy manipulation and spreading
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 effectively delivers anti-dandruff actives to the scalp, providing balanced coverage and stability, preventing dripping and uneven distribution, while allowing easy application and spread, thus enhancing efficacy and user experience.
Implementation Method 1
the composition is shear thinning and has (1) a zero shear viscosity value measured at 0.01 Pa of greater than about 1,500 Pa s; (2) a moderate stress viscosity value measured at 1 Pa viscosity of greater than about 1,000 Pa s; and (3) a high shear rate viscosity value measured at 100 l/s of less than about 0.5 Pa s
Data Source
AI summary
A scalp care composition comprising from 1% to 99% of a volatile carrier; from 0.05% to 10% of a polymeric rheology modifier and mixtures thereof; from 0.03% to 1% of particulate scalp benefit agent wherein the composition is shear thinning and has (1) a zero shear viscosity value measured at 0.01 Pa of greater than about 1,500 Pa s; (2) a moderate stress viscosity value measured at 1 Pa viscosity of greater than about 1,000 Pa s; and (3) a high shear rate viscosity value measured at 100 l/s of less than about 0.5 Pa s.