Dialdehyde Crosslinking for Durable Keratin Styling
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Solution Overview
Problem
Existing hair straightening methods are damaging, time-consuming, and often require harsh chemicals like formaldehyde, which is carcinogenic, and do not allow for long-lasting styles without re-treatment after shampooing, posing safety and durability concerns.
Innovation Solution
A method using a crosslinking composition comprising dialdehyde compounds, optionally a photocatalyst, and a cosmetically acceptable carrier applied to keratin fibers, followed by mechanical shaping at temperatures between 50°C to 280°C, to achieve a semi-permanent hairstyle that lasts through multiple shampoo treatments without breaking disulfide bonds or using carcinogenic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If permanent methods using high pH solutions are used to straighten hair, then hair can be permanently straightened, but hair is damaged and disulfide bonds are broken
Solution Approach 1:
The invention changes the chemical parameters of the treatment by using dialdehyde compounds at controlled pH levels instead of high pH solutions, achieving long-lasting styling without the damaging effects of traditional permanent methods
Solution Approach 2:
Dialdehyde compounds act as intermediary agents that form crosslinks between keratin chains without breaking disulfide bonds, providing a mediating mechanism that achieves permanent-like results through a different chemical pathway that preserves hair integrity
2Duration of action of stationary object
If formaldehyde is used in Brazilian Keratin Treatments to achieve semi-permanent straight hair, then hairstyle lasts several months, but formaldehyde is carcinogenic and causes safety concerns
Solution Approach 1:
The invention extracts and removes formaldehyde from the treatment composition entirely, replacing it with dialdehyde compounds that provide the same crosslinking function without the carcinogenic properties, thus eliminating the harmful factor while preserving the beneficial duration effect
Solution Approach 2:
The patent uses alternative crosslinking agents (dialdehyde compounds) that are safer and can be applied in controlled amounts, replacing the need for carcinogenic formaldehyde while achieving comparable or superior results without long-term health risks
3Duration of action of stationary object
If redox chemistry with thioglycolic acid and hydrogen peroxide is used to achieve semi-permanent benefits, then curly hair is transformed to straight hair, but strong sulphur smell and overprocessing are concerns
Solution Approach 1:
The invention changes the chemical mechanism from redox chemistry to crosslinking chemistry using dialdehyde compounds, which do not produce sulphur-containing byproducts, thereby eliminating the strong sulphur smell while maintaining semi-permanent styling benefits
Solution Approach 2:
Instead of using reducing agents that break disulfide bonds and create unpleasant smells, the invention uses dialdehyde compounds that crosslink keratin chains through a different mechanism, converting the approach from bond-breaking to bond-forming, which eliminates the harmful sulphur smell while achieving the desired styling effect
4Duration of action of stationary object
If high temperature (232°C) is used with formaldehyde in Brazilian Keratin Treatments, then semi-permanent straight hair is achieved, but hair is damaged and reverts to curly configuration after shampooing
Solution Approach 1:
The invention changes the temperature parameter from high heat (232°C) to lower temperatures (50-150°C), achieving comparable or superior durability through the crosslinking mechanism of dialdehyde compounds without the damaging effects of extreme heat
Solution Approach 2:
The treatment creates a composite structure within the hair shaft through crosslinking of dialdehyde compounds with keratin, forming a durable network that maintains hairstyle through shampooing without requiring high temperature activation
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 durable, long-lasting hairstyle resistant to shampoo treatments, improving hair manageability and reducing damage, while eliminating the need for frequent re-treatment and harsh chemicals.
Implementation Method 1
providing a crosslinking composition comprising a dialdehyde compound, applying the crosslinking composition to keratin fibers
Implementation Method 2
mechanically shaping the kerating fibers with an appliance at a temperature of from about 50° C. to about 280° C.
Data Source
AI summary
Described herein is a method for shaping keratin fibres including (i) providing a crosslinking composition comprising from about 1% to about 20% of a dialdehyde compound, optionally a photocatalyst, and a cosmetically acceptable carrier; (ii) applying the crosslinking composition to keratin fibres; and (iii) mechanically shaping the keratin fibres with an appliance at a temperature of about 50° C. to about 280° C.