Acidic Bleach Activator Composition for Neutral-Condition Stability
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Solution Overview
Problem
Existing oxidizing and bleaching agents, such as those using sodium hypochlorite, pose health risks and generate toxic gases, while oxygen-based bleaching agents with organic peroxy acids are unstable in neutral conditions, reducing their bleaching power.
Innovation Solution
A composition containing specific compounds represented by general formulas (A1) and (A2) in an acidic aqueous solution, which stabilizes and enhances bleaching power even in neutral conditions when combined with hydrogen peroxide, using a bleach activator that forms peroxy acid species effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium hypochlorite is used as a bleaching agent, then bleaching performance is improved, but health safety deteriorates due to eye and skin irritation and toxic gas generation
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sodium hypochlorite with hydrogen peroxide as the oxidizing agent and using organic acid esters (such as carboxylic acid succinimide esters or carboxylic acid sulfonimide esters) as bleach activators. This parameter change transforms the bleaching system from a chlorine-based to an oxygen-based system, maintaining effective bleaching performance while eliminating the harmful effects of chlorine gas and skin/eye irritation associated with sodium hypochlorite.
2Reliability
If organic peroxy acids are used as bleach activators in neutral conditions, then bleaching power is improved, but stability deteriorates
Solution Approach 1:
The patent applies preliminary action by using organic acid esters that are stable in neutral aqueous solutions and only activate to form peroxy acid species when needed. The organic acid esters (such as N-acylsuccinimides or N-acylsulfonimides) remain stable during storage and handling in neutral conditions, then activate upon contact with hydrogen peroxide to generate the required peroxy acid species for bleaching, thus achieving both stability during storage and effectiveness during use.
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 maintains stability and bleaching efficacy in neutral conditions, providing effective oxidizing and bleaching capabilities without the health hazards of traditional agents.
Implementation Method 1
In oxygen-based bleaching agents, activated bleaching species (organic peroxy acids or the like) are produced by reacting, for example, hydrogen peroxide as an oxidizing agent with organic acid esters or the like as bleach activators, and objects are oxidized and bleached therewith.
Data Source
AI summary
A composition containing, (A) one or more compounds selected from a compound of general formula (A1) and a compound of general formula (A2) and water, the composition being acidic,wherein R1 is an alkyl group having 1 to 24 carbons which may contain a heteroatom, R12 is a group having 1 to 24 carbons in total which contains a carbon atom and a heteroatom of an ion paired with N+ of the pyridine ring and which may contain a heteroatom different from the heteroatom, L is n halogen atoms, n being 1, 2 or 3, and L is bonded to any n different carbon atoms at positions 2, 4 and 6 of the pyridine ring, A− is an anion, and a group other than L may be bonded to a carbon atom other than the carbon atom bonded to L of the carbon atoms of the pyridine ring.