Pigment Dyeing Composition with Permeable Applicator
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Solution Overview
Problem
Current methods for non-permanent hair dyeing using pigments often require bleaching, cause damage to hair, have low resistance to shampooing, and are time-consuming and difficult to apply accurately, especially for small areas like eyelashes and eyebrows.
Innovation Solution
A method using a container with a permeable applicator for applying a composition containing hybrid hydrophobic film-forming acrylic polymer, linear block silicone copolymer, and pigments, allowing for efficient and homogeneous dyeing without bleaching, damage, or the need for additional accessories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pigment-based non-permanent coloring is used, then bleaching is avoided and hair damage is reduced, but the coloring has low resistance to shampooing and washes out quickly
Solution Approach 1:
The patent combines multiple polymers (acrylic polymer, vinyl polymer, and silicone copolymer) in a single composition to achieve both hair protection and coloring persistence. The acrylic and vinyl polymers form a film that binds pigment to hair, while the silicone copolymer enhances adhesion and provides water resistance, creating a composite system that resists shampooing without requiring bleaching.
Solution Approach 2:
The patent modifies the chemical parameters of the composition by adjusting polymer ratios, molecular weights, and functional groups to optimize both persistence and gentleness. Specifically, the silicone copolymer content and its crosslinking density are tuned to enhance water resistance while maintaining flexibility and non-damaging properties to the hair structure.
2Manufacturing precision
If traditional application methods with brushes and boards are used, then coverage can be achieved, but the application process is time-consuming and difficult to apply accurately to small areas
Solution Approach 1:
The patent employs a thin film-forming composition that can be applied directly to the hair using simple applicators. The film-forming polymers create a uniform coating that adheres to individual hairs, enabling precise application to small areas like eyebrows and eyelashes without requiring traditional brushes or application boards, thus reducing both time and improving accuracy.
3Manufacturing precision
If multiple stages and accessories are used for pigment coloring, then complete coverage can be achieved, but the process becomes complex and requires multiple steps including drying
Solution Approach 1:
The patent combines multiple functions into a single composition: the polymers provide film-forming, adhesion, and water-resistant properties simultaneously, while the pigment provides color. This eliminates the need for separate priming, coloring, and sealing steps, allowing complete coverage and uniformity to be achieved in a single application without multiple accessories or stages.
4Reliability
If coating compositions are used to achieve persistent coloring, then washing resistance improves, but the coating becomes sensitive to fatty substances like sebum and feels rough
Solution Approach 1:
The patent adjusts the chemical parameters of the coating by incorporating silicone copolymer with specific functional groups that provide water resistance without creating a rough or sebum-sensitive surface. The polymer composition and crosslinking density are optimized to maintain flexibility and compatibility with natural hair oils, preventing the coating from feeling rough or reacting adversely to sebum while still providing washing resistance.
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 method provides a persistent, smooth, and homogeneous color that resists washing and styling without damaging the hair, allowing for easy application and individualization of fibers.
Implementation Method 1
a container comprising a removable applicator end piece comprising a permeable material through which the composition can pass
Data Source
AI summary
A subject-matter of the present invention is a method for dyeing human keratinous fibres, which consists in applying a dyeing composition using a container comprising a removable applicator comprising a permeable material through which the composition can pass, the composition being applied by bringing the applicator into contact with the dry or wet fibres, the said composition comprising at least one aqueous dispersion of particles of hybrid hydrophobic film-forming acrylic polymer, at least one linear block silicone copolymer and at least one pigment. The method according to the invention makes it possible to obtain a coloured coating which is persistent towards shampooing operations or washing operations and which leaves the treated fibres individualized, with an improved cosmetic feel; the treated fibres being the hair (roots, sidelocks); non-head hair (beard, moustache); eyelashes or eyebrows.