Coated Particles for Controlling Bleaching Catalyst Activity
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Solution Overview
Problem
Transition metal ion-containing bleaching catalysts can cause damage to substrates, particularly at high temperatures and in the presence of hydrogen peroxide, due to their oxidizing environment, which is problematic for applications involving cellulosic substrates.
Innovation Solution
The use of coated particles with a meltable core comprising an inorganic solid support material or catalase enzyme, which releases substances that adsorb or degrade the bleaching catalysts at a predetermined temperature, reducing substrate damage by controlling the activity of the bleaching catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transition metal ion-containing bleaching catalysts are used to enhance stain-bleaching activity, then bleaching efficacy is improved, but substrate damage increases due to oxidizing environment at high temperatures
Solution Approach 1:
The patent introduces coated particles as an intermediary substance that mediates between the bleaching catalyst and the substrate. These particles are designed to adsorb the transition metal ion-containing bleaching catalyst at high temperatures, preventing direct contact between the catalyst and cellulosic substrate, thereby reducing substrate damage while maintaining bleaching activity
Solution Approach 2:
The patent utilizes temperature-dependent parameter changes to control catalyst activity. The coated particles exhibit temperature-sensitive adsorption behavior, where the coating material's adsorption capacity increases at high temperatures (above 40°C), automatically regulating the catalyst's interaction with the substrate based on operating conditions
2Object-affected harmful factors
If coated particles with meltable core are used to control catalyst activity, then substrate damage is reduced, but device complexity increases due to additional particle structure
Solution Approach 1:
The patent segments the protective system into distinct functional components: a core material (such as salt or sugar) coated with a temperature-sensitive coating layer. This segmentation allows each component to perform its specific function - the core provides structural support and the coating provides temperature-responsive catalyst adsorption - simplifying the overall design while achieving complex temperature-dependent behavior
Solution Approach 2:
The coated particles are designed as disposable protective agents that are consumed during the bleaching process. The coating material is intentionally designed to be relatively short-lived and easily replaceable, allowing for simple formulation and application without requiring complex recovery or regeneration systems
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
This approach effectively reduces substrate damage by controlling the activity of transition metal ion-containing bleaching catalysts, allowing for safer use in bleaching processes without compromising bleaching efficacy.
Implementation Method 1
coating encapsulating the core, which comprises a material that melts at a temperature of between about 30 °C and about 90 °C
Implementation Method 2
inorganic solid support materials, such as clays, can adsorb metal-ligand complexes and metal ions via cationic exchange mechanisms
Implementation Method 3
catalase enzymes or mimics thereof to decompose hydrogen peroxide that is initially present in a bleaching medium
Data Source
AI summary
The present invention relates to bleaching formulations comprising transition metal ion- containing bleaching catalysts, which formulations additionally comprise coated particles having meltable cores that comprise an inorganic solid support material and/or a catalase enzyme; and to the coated particles per se. The invention also relates to uses of the bleaching formulations and the coated particles described herein in methods of bleaching.