Sequential Hair Coloring and Shaping Process
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Solution Overview
Problem
Current methods for simultaneously achieving intensive, long-lasting hair color and permanent shaping, especially curling, in a single process often result in suboptimal results, including poor curl effectiveness, color intensity, and excessive hair damage.
Innovation Solution
A novel process involving sequential applications of an aqueous oxidative coloring composition, a reducing agent, and an oxidizing agent, followed by a second oxidative coloring step, optimized with specific pH ranges and processing times, to achieve excellent color intensity, brilliance, and durability while minimizing hair damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If oxidative colouring and permanent shaping are carried out in a single process using conventional methods, then time efficiency is improved, but color intensity, curl effectiveness, and hair damage are worsened
Solution Approach 1:
The single-process chemical treatment is segmented into five distinct sequential steps: (a) first oxidative colouring composition application, (b) reducing agent application for permanent shaping, (c) first oxidizing agent application, (d) second oxidative colouring composition application, and (e) second oxidizing agent application. Each step has specific processing times and conditions to ensure both color intensity and curl effectiveness are achieved without excessive hair damage.
2Device complexity
If the fixing stage of permanent shaping is used simultaneously for colouring, then process complexity is reduced, but color intensity and durability are worsened
Solution Approach 1:
The coloration process uses periodic action by applying oxidative colouring compositions at two separate stages: initially before the permanent shaping fixing stage, and again after the fixing stage. This ensures that the color develops properly under optimal conditions at each stage, achieving both intensity and durability without compromising the permanent shaping process.
3Reliability
If strong alkaline conditions and high concentration oxidizing agent are used for oxidative colouring, then color intensity is improved, but hair damage is worsened
Solution Approach 1:
The process controls parameters by using two different oxidative colouring compositions with different strengths. The first composition is applied under controlled conditions for initial coloration, and the second composition is applied after the permanent shaping fixing stage to enhance color intensity. Each composition has specific pH ranges and oxidizing agent concentrations optimized for its stage, ensuring color intensity while minimizing cumulative hair damage.
4Reliability
If multiple chemical treatments are applied sequentially, then color durability and curl permanence are improved, but process complexity and processing time are worsened
Solution Approach 1:
The process merges oxidative colouring and permanent shaping into a single integrated process where both functions are achieved through coordinated application of compositions and processing steps. The five steps are designed to overlap in time and function, ensuring that color development and permanent shaping occur simultaneously rather than as separate sequential processes, thus improving efficiency while maintaining reliability.
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 process delivers excellent, intensive, and long-lasting hair color with excellent curling results while reducing hair damage, as demonstrated by the examples provided.
Implementation Method 1
an aqueous oxidative colouring composition based on at least one oxidative dye precursor and optionally at least one coupling substance but not comprising any direct dye is mixed with a composition comprising at least one oxidizing agent
Implementation Method 2
an aqueous composition comprising at least one reducing agent is applied onto hair
Implementation Method 3
a composition comprising at least one oxidizing agent is applied onto hair processed for 2 to 15 min
Data Source
AI summary
The present invention is related to a process for colouring and permanent shaping keratin fibres especially human hair in a single process. The novel process for colouring and permanently shaping keratin fibres especially human hair according to the present invention includes the following steps: a- an aqueous oxidative colouring composition based on at least one oxidative dye precursor and optionally at least one coupling substance but not comprising any direct dye is mixed with a composition comprising at least one oxidizing agent and applied onto hair and rinsed off from hair with water after processing 5 to 45 min at a temperature of 20 to 45°C and towel dried, b- the towel dried hair is put on curlers, c- an aqueous composition comprising at least one reducing agent is applied onto hair and rinsed off from hair with water after a processing time of 2 to 30 min at ambient temperature and towel dried, d- a composition comprising at least one oxidizing agent is applied onto hair processed for 2 to 15 min and optionally rinsed off from hair with water and optionally towel dried, and e- an aqueous oxidative colouring composition based on at least one oxidative dye precursor and optionally at least one coupling substance is mixed with a composition comprising at least one oxidizing agent and applied onto hair and rinsed off from hair with water after processing 5 to 45 min at a temperature of 20 to 45°C and towel dried and dried with a dryer or left to dry in the air.