Crosslinked Starch Aqueous Gel for Tacky Skin Finish
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Solution Overview
Problem
Aqueous gel-based facial skin cleansing masks often exhibit a dragging effect, a coarse and tacky skin finish, and a viscous, slimy appearance, which are unpleasant for users, and typically require emulsifiers that can opacify and reduce the feeling of lightness and freshness.
Innovation Solution
A cosmetic composition comprising 7.5% to 13.5% crosslinked C1-C4 carboxyalkyl starch and a C2-C5 monoalcohol, such as ethanol, forming a single-phase aqueous gel that is flexible, uniform, and translucent, without the need for fatty substances or high surfactant content, using modified starches like sodium carboxymethyl starch from potato sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an aqueous gel galenical form is used for cleansing mask composition, then the composition provides a light feel, transparent/translucent appearance, and ease of removal, but it generates a dragging effect, coarse and tacky skin finish, and viscous/slimy appearance
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific gelling agents (hydrocolloids like carrageenan, xanthan gum, or alginates) and exfoliating agents (polyethylene beads, silica, or plant-based alternatives) in optimized concentrations. This modifies the rheological properties of the aqueous gel to reduce dragging effect while maintaining ease of removal and transparent appearance.
2Ease of operation
If a fatty liquid phase is added to overcome negative sensory aspects, then the cosmeticity and sensoriality are improved, but the transparent/translucent appearance is lost (opacification) and the feeling of lightness and freshness is reduced
Solution Approach 1:
The patent uses amphoteric surfactants as intermediary substances that provide the necessary cosmeticity and sensoriality improvements without causing opacification. These surfactants act as mediators between the aqueous phase and the skin, delivering enhanced cosmetic performance while preserving the transparent/translucent appearance and feeling of lightness.
3Ease of operation
If emulsifier is added to combine aqueous gel with fatty liquid phase, then the cosmeticity is improved, but discomfort is generated during mask application
Solution Approach 1:
The patent employs amphoteric surfactants that provide effective emulsification and cosmetic improvement without generating discomfort. These surfactants are selected for their mildness and compatibility with skin, delivering the necessary cosmetic performance while avoiding the adverse effects associated with conventional emulsifiers during mask application.
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 soft, non-tacky skin finish, easy removal, and enhanced sensory perception of freshness and glidance, while reducing environmental impact and allowing for natural ingredient formulation.
Implementation Method 1
the combination, in an aqueous medium, of a gelling system formed from at least one crosslinked modified starch and of a C2-C5 lower alcohol
Data Source
AI summary
The present invention relates to a composition of aqueous gel type comprising from 7.5% to 13.5% by dry weight, relative to its total weight, of at least one modified crosslinked C1-C4 carboxyalkyl starch and at least one C2-C5 monoalcohol. A composition according to the invention is in particular of use as a skin cleansing mask, in particular a face cleansing mask. The invention also relates to a process for the preparation thereof, to a process for cosmetic treatment of keratin materials and to a cosmetic process for cleansing a keratin material.