Compositions and methods for use in surface decontamination
Inventors
KANG, JASON • Tyan, Kevin • Jin, Katherine
Assignees
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Publication Number
US-11802260-B2
Publication Date
2023-10-31
Expiration Date
Abstract
The disclosure provides compositions and methods for making a colorized solution of an aqueous disinfectant that is both stable in bulk solution and will fade to clear within a predetermined period of time after being applied to a surface, for example as a spray or film. The compositions and methods described here allow an end user to visualize both the extent of coverage and the duration of contact of the disinfectant with the surface, thereby providing more efficient disinfection of the surface.
Core Innovation
The invention relates to solid and/or liquid point-of-use additive compositions for disinfectant coverage visualization and contact time indication. The compositions include oxidizable water-soluble pigments and disinfectant additives that allow a colored disinfectant to be stable in bulk for a predetermined period and then fade to clear after a predetermined period following application.
In one aspect, the composition is formulated as a solid composition for mixing with a disinfectant solution. The solid composition includes a pH sensitive colorant, a surfactant, and a rheology modifier, and in another aspect further includes an alkaline builder, with defined weight ranges for the components.
The disclosure further includes modulation mechanisms for desired bulk color stability versus post-application fading behavior, including surfactant micelle dye sequestration, alkaline builder pH shift to reduce dye oxidation, rheology modifiers to slow acidification/oxygen exposure, and ROS-generating catalysts and/or other additives to accelerate or tune fading. The disclosure presents pigment examples and disinfectant classes and reports absorbance time courses and stability/fading durations.
Claims Coverage
The document provides two independent claim families covering solid compositions that colorize a disinfectant solution when mixed therewith. Across the independent claims, the inventive features are organized around defined components, distinct quantitative ranges, and a solid-form limitation.
Solid pH sensitive colorant, surfactant, and rheology modifier colorizing disinfectant solution
A solid composition comprising a pH sensitive colorant, a surfactant, and a rheology modifier, wherein the pH sensitive colorant is present in an amount of from 1-10% w/w, based on the total weight of the composition; the total amount of surfactant is present in an amount of from 25-97% w/w, based on total weight of the composition; the rheology modifier is not the surfactant; and the composition is capable of colorizing a disinfectant solution when mixed therewith.
Solid pH sensitive colorant, surfactant, alkaline builder, and rheology modifier with defined weight ranges
A solid composition comprising a pH sensitive colorant, a surfactant, an alkaline builder, and a rheology modifier, wherein the pH sensitive colorant is present in an amount of from 1-10% w/w; the total amount of surfactant is present in an amount of from 25-97% w/w; the rheology modifier is not the surfactant; the alkaline builder is present in an amount of from 2-50% w/w; and the composition is capable of colorizing a disinfectant solution when mixed therewith.
Both independent claims require a solid composition that includes a pH sensitive colorant and a surfactant with specified weight ranges, plus a rheology modifier distinct from the surfactant, and that is capable of colorizing a disinfectant solution when mixed therewith. The second independent claim additionally requires an alkaline builder with a specified weight range.
Stated Advantages
No UV power needed for the visual indication.
Improved compliance with required contact times via a visual cue related to fading to clear after a predetermined period.
Portability, including solid formats such as powders/tablets/capsules.
Rapid dissolve.
Compatibility with conventional disinfectant protocols.
Documented Applications
Disinfectant surface decontamination using a point-of-use colorized disinfectant composition that fades to clear after a predetermined period following application.
Visualization of disinfectant coverage and contact time through bulk color stability followed by fading on the surface.
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