Hair Shaping Method Using C2-4 Monoaldehydes
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Solution Overview
Problem
Existing permanent hair straightening methods damage hair by breaking disulfide bonds, require professional application, and involve unpleasant chemicals and high temperatures, making them difficult to conduct and damaging to the hair.
Innovation Solution
A method using a hair treatment composition with 2-25 wt % C2-4 monoaldehydes, such as glyceraldehyde, combined with additional actives like citric acid, applied topically and followed by mechanical shaping, which does not break disulfide bonds and can be done by consumers without professional intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If permanent hair straightening compositions based on chemical treatment are used to break hair disulfide bonds, then hair can be straightened, but the hair is damaged and the process has unpleasant odour and causes irritation to the scalp
Solution Approach 1:
The invention extracts and eliminates the harmful reducing agents (ammonium thioglycolate, glyceryl monothioglycolate, etc.) from the hair straightening composition, retaining only the beneficial shaping components. This is achieved by formulating a composition that uses alternative mechanisms (non-reducing chemistry combined with mechanical shaping) to achieve straightening without the damaging chemical breakdown of disulfide bonds.
Solution Approach 2:
The invention converts the traditional approach of breaking disulfide bonds (which causes damage) into a beneficial process by using mild acids and aldehydes that temporarily alter hair structure through hydrogen bonding and protein interaction, allowing mechanical shaping without permanent chemical damage. The harmful reducing agents are replaced with beneficial mild ingredients that achieve shaping through reversible interactions.
2Shape
If traditional permanent hair straightening processes are used, then hair can be straightened, but the process is difficult to conduct and requires professional intervention
Solution Approach 1:
The invention enables consumers to perform hair straightening at home without professional assistance by using a simplified two-step process: applying the composition and then mechanically shaping the hair with a comb or brush. The composition is designed to work with everyday mechanical tools rather than requiring specialized salon equipment or expertise in chemical processing.
Solution Approach 2:
The invention replaces the complex chemical system (requiring precise control of reducing agent concentrations, timing, and neutralization steps) with a simpler mechanical system where the composition prepares the hair for easy mechanical shaping. The active ingredients facilitate shaping through reversible protein interactions rather than permanent chemical changes, allowing straightforward mechanical intervention.
3Shape
If high temperature heated implements such as straightening irons are used, then hair can be straightened, but high temperatures can cause additional damage to the hair
Solution Approach 1:
The invention applies the composition to the hair before any mechanical shaping occurs, allowing the active ingredients to prepare the hair structure for shaping. The mild acids and aldehydes in the composition temporarily modify hair protein interactions, making the hair more pliable and easier to shape with minimal or no heat, thereby preventing heat-induced damage before it can occur.
Solution Approach 2:
The invention changes the chemical parameters of the hair treatment composition to eliminate harsh reducing agents and high-temperature requirements. By using mild acids (pH 2-6) and aldehydes that work at room or body temperature, the process achieves hair straightening through chemical preparation combined with mechanical action, eliminating the need for high-temperature heating that causes damage.
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 effectively shapes hair without causing chemical damage, maintains shape after washing, and provides durable straightness benefits with or without the use of hot tools, reducing hair damage and the need for professional application.
Implementation Method 1
treating the hair by topical application of a hair treatment composition comprising from 2 to 25 wt % of one or more C2-4 monoaldehydes
Data Source
AI summary
The invention provides a method of shaping hair comprising the following sequential steps: (i) treating the hair by topical application of a hair treatment composition comprising from 2 to 25 wt % of one or more C2-4 monoaldehydes, and (ii) mechanically shaping the treated hair.