Hair Straightening and Bleaching Process Using Sequential pH Shifts
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Solution Overview
Problem
Conventional hair straightening and bleaching methods cause significant hair damage and are time-consuming, as they require separate sessions and involve harsh chemicals that deteriorate hair quality.
Innovation Solution
A two-step process combining a straightening composition with glyoxylic acid and a bleaching composition containing an oxidizing agent, applied in immediate succession to achieve semi-permanent straightening and bleaching without damaging the hair, using a straightening composition with a pH of 4 or lower and a bleaching composition with a pH of 8 to 11, reducing the time interval between treatments to minimize damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional straightening and bleaching methods are used, then hair can be straightened and lightened, but significant hair damage occurs and the process is time-consuming
Solution Approach 1:
The patent combines straightening and bleaching treatments into a single sequential process. The straightening composition (pH ≤ 4) is applied first, followed immediately by the bleaching composition (pH 8-11) without rinsing the hair in between. This merging of two separate salon visits into one reduces treatment time and minimizes cumulative chemical damage to the hair.
2Shape
If harsh chemicals are used for straightening and bleaching, then the desired cosmetic effect is achieved, but hair quality deteriorates
Solution Approach 1:
The patent utilizes extreme pH parameter changes to achieve the desired hair treatment effects. The straightening composition uses a highly acidic pH (≤ 4) to break disulfide bonds and straighten hair, while the subsequent bleaching composition uses a highly alkaline pH (8-11) to oxidize melanin and lighten hair color. This sequential parameter change allows both straightening and bleaching to occur in one session while the immediate succession minimizes the time hair is exposed to damaging conditions.
3Reliability
If separate straightening and bleaching sessions are conducted, then each treatment can be optimized, but the overall process becomes time-consuming
Solution Approach 1:
The straightening treatment is performed as a preliminary action before the bleaching treatment. By applying the straightening composition first and leaving it on the hair, then immediately applying the bleaching composition without rinsing, the patent eliminates the need for a separate washing step between treatments. This preliminary sequencing of operations reduces the total treatment time from two separate salon visits to a single session while maintaining the effectiveness of both treatments.
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 enhances hair mechanical properties and reduces damage by allowing simultaneous straightening and bleaching in a single salon visit, improving hair manageability and appearance while maintaining the hair's integrity.
Implementation Method 1
the disulfide bonds by the action of a sulfide- or thio group containing reducing agent
Implementation Method 2
Hair bleaching involves the oxidative decomposition of the melanin pigments in the hair by the action of an oxidizing agent
Implementation Method 3
The high temperature of the iron leads to a breakage of hydrogen bonds in the keratin of the hair
Data Source
AI summary
The present invention relates to a method for semipermanent straightening and bleaching of the hair in two steps, which are carried out one after another in one salon visit. For this purpose, the method of the present invention uses a first composition (straightening composition) comprising at least one carboxylic acid of the Formula (I) and a second composition, (bleaching composition) comprising least one oxidizing agent and at least one alkalizing agent. The hair is treated with the said compositions successively, so that the bleaching treatment is performed directly after the straightening treatment.