Two-Layer Hair Cosmetic Composition for Stickiness-Free Finish
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Solution Overview
Problem
Existing leave-on hair cosmetic compositions fail to provide a stickiness-free finish, smoothness, and tidiness due to difficulties in emulsifying highly polymerized silicones, which are either sticky in oil-based formulations or under-emulsified in water-based systems, leading to poor spreadability and hair quality.
Innovation Solution
A two-layer hair cosmetic composition with an oil layer containing highly polymerized silicones and volatile oils, and a water layer with a water-soluble polymeric thickening agent, allowing for easy mixing and application without stickiness, while maintaining hair smoothness and tidiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly polymerized silicones are used in an oil type composition, then the hair can be provided with smoothness, luster and tidiness, but the composition becomes sticky and has bad spreadability
Solution Approach 1:
The composition is divided into two separate layers: an oil layer containing highly polymerized silicones and a water layer containing cationic surfactants and thickening agents. This segmentation allows each layer to perform its specific function without the negative effects of mixing - the oil layer provides smoothness and tidiness while the water layer provides spreadability and anti-stickiness.
Solution Approach 2:
The water layer acts as an intermediary that modifies the properties of the oil layer. When the two layers are mixed during application, the water layer components (cationic surfactants and thickening agents) interact with the highly polymerized silicones to reduce stickiness and improve spreadability while maintaining the conditioning benefits.
2Ease of operation
If highly polymerized silicones are emulsified with water and surfactant, then spreadability improves, but sufficient amounts of highly polymerized silicones cannot be included
Solution Approach 1:
Instead of creating a single emulsion phase, the invention segments the system into an oil layer and a water layer. This allows the oil layer to contain high concentrations of highly polymerized silicones (achieving the quantity requirement) while the water layer provides the spreadability benefits, eliminating the need for full emulsification.
Solution Approach 2:
The invention changes the physical state parameters of the system by maintaining phase separation rather than creating a homogeneous emulsion. This parameter change allows high concentrations of silicones to be maintained in the oil layer while the overall composition retains good spreadability through the water layer.
3Reliability
If liquid oil is incorporated in high concentration at ordinary temperature, then the composition provides conditioning effect, but it has a sticky nature and cannot provide a good finish
Solution Approach 1:
The composition segments the oil and water phases into separate layers, allowing high concentration liquid oil to be incorporated in the oil layer for conditioning effect while the water layer counteracts the sticky nature through evaporation and surfactant action, providing a non-sticky finish.
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 stickiness-free, smooth, and tidy finish by forming a strong cosmetic film on the hair, enhancing hair manageability and appearance without the sticky feel, ensuring effective spreadability and long-lasting results.
Implementation Method 1
component (d) a volatile oil... The leave-on type hair cosmetic composition can be applied to hair to provide a stickiness-free finish feel, smoothness, luster and tidiness
Implementation Method 2
component (a) a highly polymerized silicone selected from dimethicone and dimethiconol... can be applied to hair to provide a stickiness-free finish feel, smoothness, luster and tidiness
Data Source
AI summary
A leave-on type hair cosmetic composition having the following two layers A and B: Layer A of an oil layer containing the following component (a) in an amount of 0.5-40% by mass in the hair cosmetic composition, (a) a highly polymerized silicone selected from dimethicone and dimethiconol and having a number average degree of polymerization of 1,000-20,000; and Layer B of a water layer containing the following components (b) and (c), (b) a water-soluble polymeric thickening agent, and (c) water.