Aqueous Oxidizing Composition for Hair Bleaching at Acidic pH
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Solution Overview
Problem
Current aqueous oxidizing compositions for bleaching keratin fibers, such as human hair, are ineffective at neutral to acidic pH ranges and require high alkaline pH levels for significant bleaching, and existing methods to enhance bleaching power without increasing active ingredient content or altering mildness have not been satisfactory.
Innovation Solution
Incorporating mono and/or disaccharides like glucose, fructose, and polyethylene glycol (PEG) into an aqueous oxidizing composition at specific concentrations and pH ranges, along with an alkalizing agent, to enhance bleaching efficacy while maintaining mildness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high alkaline pH levels (9-12) are used to achieve significant bleaching, then bleaching power is improved, but mildness of the composition deteriorates
Solution Approach 1:
The patent changes the pH parameter from conventional alkaline (9-12) to acidic range (1-5), and simultaneously changes the chemical composition by adding sugars (10-60% w/w) to the oxidizing composition. This parameter change allows achieving effective bleaching under acidic conditions without the harsh effects of high alkalinity, thus resolving the contradiction between bleaching power and mildness.
2Power
If buffering salts are added to improve bleaching power, then some enhancement is achieved, but the level of bleaching is still not satisfactory
Solution Approach 1:
Instead of using buffering salts which provide only partial improvement, the patent employs sugars (mono- and/or disaccharides) at high concentrations (10-60% w/w) combined with acidic pH (1-5). This different approach based on parameter changes achieves satisfactory and superior bleaching levels that buffering salts alone cannot attain.
3Power
If oxidizing agent content is increased to improve bleaching power, then bleaching effectiveness is improved, but mildness of the composition deteriorates
Solution Approach 1:
The patent maintains oxidizing agent content within the range of 0.1-25% w/w (without necessarily increasing it) but achieves improved bleaching power through the combination of acidic pH (1-5) and high sugar content (10-60% w/w). This parameter change strategy allows achieving effective bleaching without increasing oxidizing agent concentration, thereby preserving mildness.
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 effectively bleaches hair to lighter colors at acidic pH levels, achieving better bleaching results compared to compositions without these additives, with sucrose and trehalose being particularly effective as disaccharides, and PEG-20 being a preferred polyethylene glycol variant.
Implementation Method 1
aqueous oxidizing composition comprising one or more oxidizing agent... high level of colour bleaching is achieved
Data Source
AI summary
The present invention relates to an aqueous oxidizing composition comprising one or more oxidizing agent, one or more sugar and/or one or more polyethylene glycol and having a pH in the range of 1 to 5.