Compositions and methods for use in surface decontamination
Inventors
KANG, JASON • Tyan, Kevin • Jin, Katherine
Assignees
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Publication Number
US-10246671-B2
Publication Date
2019-04-02
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 disclosure relates to a solid composition comprising at least one water-soluble pigment, at least one surfactant selected from sodium dodecyl sulfate (SDS), sodium xylene sulfonate (SXS), an acetylenic diol, and mixtures thereof, an alkaline builder selected from NaOH and Ca(OH)2, and a rheology modifier wherein the rheology modifier is lambda carrageenan. The composition is defined with specified amounts of the water-soluble pigment, the surfactant, the alkaline builder, and the rheology modifier based on the total weight of the composition.
The disclosure further describes point-of-use, colorizable oxidizing disinfectant indicator additives in which the colored solution is stable in bulk for minutes-to-hours, but fades to clear after application to a surface within a predetermined time. The color persistence and fade behavior are attributed to formulation variables including oxidizable water-soluble pigments, surfactants, alkaline builders, and optional rheology modifiers.
In the described example performance, the composition colors a bulk aqueous sodium dichloroisocyanurate (NaDCC) solution with color stability for at least 4 hours, while the color fades to clear within 1 to 15 minutes when applied as a spray or film to a surface. The disclosure identifies specific formulation components and their amounts to achieve the bulk stability and surface fade-to-clear timing.
Claims Coverage
The partial claim set includes one independent claim and several dependent claims that refine the solid composition by specifying pigment identity, quantitative component ratios, and color behavior when formulated into a NaDCC-containing solution and applied to a surface. Across the independent claim and refinements, the inventive features center on a defined solid composition containing a water-soluble pigment, specified surfactants, a specified alkaline builder, and lambda carrageenan as the rheology modifier, together with performance constraints for color stability and fade-to-clear behavior after application.
Solid composition with defined pigment, surfactant, alkaline builder, and lambda carrageenan
A solid composition comprising at least one water-soluble pigment in an amount of from 1.5-22% w/w, at least one surfactant in an amount of from 10-75% w/w selected from sodium dodecyl sulfate (SDS), sodium xylene sulfonate (SXS), an acetylenic diol, and mixtures thereof, an alkaline builder in an amount of from 2-50% w/w selected from NaOH and Ca(OH)2, and a rheology modifier in an amount of from 10-65% w/w wherein the rheology modifier is lambda carrageenan.
Bulk NaDCC coloring with stability and fade-to-clear timing upon surface application
The composition colors a bulk aqueous sodium dichloroisocyanurate (NaDCC) solution with color stability for at least 4 hours, and the color fades to clear within 1 to 15 minutes when applied as a spray or film to a surface.
The claim coverage centers on a lambda carrageenan-containing solid composition with specified water-soluble pigment, surfactant, and alkaline builder ranges, and on demonstrated behavior in a bulk aqueous NaDCC solution where the color remains stable for at least 4 hours but fades to clear within 1 to 15 minutes after spray or film application to a surface.
Stated Advantages
Bulk color stability for at least 4 hours in a bulk aqueous sodium dichloroisocyanurate (NaDCC) solution.
Color fades to clear within 1 to 15 minutes when applied as a spray or film to a surface.
Documented Applications
Disinfecting a surface by applying the composition to a surface as a spray or film and waiting until the color fades to clear.
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