Stable Bleaching Composition Using Phenoxyethanol Stabilizer
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Solution Overview
Problem
Hypohalite bleaching compositions face stability issues due to the decomposition of pigments and dyes by oxidizing agents, leading to reduced cleaning performance and potential staining, with existing stabilization systems being inadequate for long-term stability and efficiency.
Innovation Solution
A bleaching composition comprising a hypohalite bleach, a stabilizer of formula R1-O-(R2CHCH2O)s-H, such as phenoxyethanol, and a surfactant system, along with a metal-phthalocyanine pigment and brightener, which maintains chemical stability and cleaning performance over time, and prevents staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pigments and dyes are added to hypohalite bleach-containing compositions to improve aesthetics and recognition, then the appearance and consumer identification are enhanced, but the pigments and dyes are decomposed by the oxidizing agents leading to loss of color, settling, and reduced stability
Solution Approach 1:
A stabilizing agent is introduced as an intermediary substance that protects pigments and dyes from decomposition by hypohalite bleach. The stabilizing agent acts as a mediator between the oxidizing agent and the colorants, preventing direct harmful interactions while allowing the bleach to maintain its cleaning functionality.
Solution Approach 2:
The patent employs inexpensive stabilizing agents such as phenoxyethanol that can be easily incorporated into the composition. These stabilizers provide temporary protection during storage and application, sacrificing themselves to protect the more valuable pigments and dyes from oxidation.
2Productivity
If hypohalite bleach is used to maintain cleaning performance, then effective bleaching is achieved, but the oxidizing agents cause premature decomposition and reduce efficiency over time
Solution Approach 1:
The stabilizing agent is incorporated into the composition in advance to prevent decomposition before it occurs. By adding the stabilizer beforehand, the system proactively protects against oxidation during storage and application, ensuring the bleach maintains its effectiveness throughout its intended lifespan.
Solution Approach 2:
The patent modifies the chemical environment of the bleach composition by adding stabilizing agents that change the oxidation resistance parameters. This allows the hypohalite bleach to maintain its strong oxidizing capability for cleaning while the stabilizer modifies the overall system to resist premature decomposition.
3Ease of manufacture
If dyes and pigments are incorporated to create coloured bleaching compositions, then consumer recognition and aesthetics are improved, but the interaction with oxidizing agents accelerates decomposition and reduces stability
Solution Approach 1:
The stabilizing agent serves as a protective intermediary between the colorants and the oxidizing environment. It creates a protective chemical environment that allows pigments and dyes to maintain their color properties throughout the shelf life and application period of the bleach product.
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 achieves significant reduction in pigment and brightener decomposition, maintaining bleaching performance and stability for extended periods, with phenoxyethanol providing a synergistic effect with the surfactant system to ensure the stability of the bleaching agents and pigments.
Implementation Method 1
add a stabilising agent to hypohalite bleach-containing compositions in order to prevent, or at least reduce, the decomposition of further ingredients, in particular pigments and/or dye, present in such compositions
Implementation Method 2
hypohalite bleaches are oxidising agents and pigments and dyes are very prone to attacks
Implementation Method 3
phenoxyethanol providing a synergistic effect with the surfactant system to ensure the stability of the bleaching agents and pigments
Data Source
AI summary
The present invention relates to an hypohalite liquid bleaching composition comprising at least one metal- phthalocyanine pigment or at least one optical brightener or mixtures thereof; at least a surfactant system selected from the group consisting of: a) at least 0.01% by weight of an anionic surfactant; b) at least 0.01% by weight of a cationic surfactant; c) at least 0.5% by weight of a zwitterionic surfactant; d) at least 0.01% by weight of a non ionic surfactant; or e) a mixture of at least two of a), b), c) and d); and a stabilizer of formula (I) R1-O-(R2CHCH2O)s-H (I) wherein R1 represents an optionally substituted phenyl group or benzyl group; R2 represents a hydrogen atom or a methyl group; and s represents an integer from 0 to 4. It further relates to uses of the stabilizer of formula I and to a process of treating a surface with the hypohalite liquid bleaching composition.