Targeted performance of hypohalite compositions thereof

a technology of hypohalite and composition, applied in the field of hypohalite-based cleaners, can solve the problems of unpleasant odor and negative side effects of cleaning agents, and achieve the effect of reducing oxidant concentration and preventing or minimizing negative side effects

Inactive Publication Date: 2013-08-22
THE CLOROX CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]In one aspect of the invention, there is a two-part composition for treatment of a surface, the composition comprising: an oxidant first part comprising a hypohalous acid or a hypohalite; a reductant second part comprising a nitrite; wherein the first and second parts are initially separate s...

Problems solved by technology

However, these cleaners have some negative side effects.
Hypohalite based cleaners typically contain strong bleaching species and have certain undesirable side effects associated with the...

Method used

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  • Targeted performance of hypohalite compositions thereof
  • Targeted performance of hypohalite compositions thereof
  • Targeted performance of hypohalite compositions thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

Nitrite

[0124]In one embodiment of the invention, nitrite has been found to be a suitable reductant operational across the ranges of concentration illustrated below. Accordingly, in one embodiment of the invention, nitrite has been explored as a reductant as shown in FIG. 2, where the materials and composition parameter ranges explored are as follows: sodium hypochlorite (0.02 wt % to 0.3 wt %), sodium nitrite (0.03 wt % to 0.8 wt %), solution pHs from 6 to 11, wherein the molar ratio of reductant to oxidant (i.e., R / O) varied from 3:1 to 1:2.

[0125]In these embodiments, the effect of increasing R / O ratio is clearly evident with higher ratios eliminating hypochlorite more quickly FIG. 2. Further, the importance of controlling pH is evident in FIG. 3, where at higher pHs the reaction proceeds slower in embodiments of the invention where the initial pH is raised.

[0126]A broad range of conditions may be used to control the rate of hypochlorite consumption (this data may be plotted as hyp...

example 2

Fructose

[0127]Fructose and other reducing sugars have been found to be suitable for use in the present invention as reductants. Results show an improved utility in higher pH solutions. Without being bound by theory this is believed to be due to reduced reactivity of the sugar toward hypochlorite when the sugar exists in its closed cyclic ester conformation. Elevated pH promotes hydrolysis of the sugar ring to the open configuration which is more reactive with hypochlorite.

[0128]Ranges of explored parameters and solution conditions tested were as follows: sodium hypochlorite from 0.02 wt % to 1.0 wt %; fructose from 0.05 wt % to 2.77 wt %, solution pHs from pH 7 to pH 13.4; covering a range of R / O ratios from about 0.7:1 to about 21.7:1.

[0129]In this series of embodiments, at elevated pH a broad range of conditions may be used to control the rate of hypochlorite consumption. A sub-sample of reaction conditions and results are found in Table 2 and FIGS. 6-7.

TABLE 2FormulaReductant(Tra...

example 3

Chelants

[0132]Other embodiments of the invention may employ selected chelants (sequestrants), such as disodium calcium EDTA (CaEDTA), which can be used to limit hypochlorite lifetime in a controlled fashion at lower pH where EDTA alone acts too rapidly in quench the initial hypochlorite concentration. EDTA reacts almost instantly at any pH below 12, but CaEDTA has utility in the near neutral region. Without being bound by theory, it is believed that the calcium salt likely works because the chelation of an aqueous calcium ion by EDTA makes the molecule much less reactive toward hypochlorite. The utility of using pH neutral compounds such as chelants as effective reductants or quenching agents enables ultimate solutions near neutral pH to be employed in the present invention. Again, without being bound by theory, it is believed that chelants act as does the class of other acidic reductants, because at lower pHs the mother ligand (here the partially chelated EDTA species) begins to re...

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Abstract

This invention relates to extend the benefits of using hypochlorite compounds such as sodium hypochlorite to clean and disinfect articles while reducing or eliminating the side effects of treating an article with a strong oxidant material. The invention relates to a single step process involving mixing of precursor compositions of a suitable hypohalite or hypohalous acid with a solution of a reducing agent. Optionally a buffer may be present in either or both precursor compositions, such that at time of use such active hypohalous acid concentration in the resulting aqueous mixture remains at a sufficient activity level to effect one or more desired benefits against a target substrate for a desired period of time. The oxidant is substantially consumed by reaction with the reducing agent after the time needed for achieving the desired benefit has passed.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Patent Application No. 61 / 600,348, filed Feb. 17, 2012 entitled TARGETED PERFORMANCE OF HYPOHALITE COMPOSITIONS, METHODS AND SYSTEMS THEREOF, the disclosure of which is incorporated herein in its entirety.BACKGROUND OF THE INVENTION[0002]1. The Field of the Invention[0003]The present invention relates to hypohalite-based cleaners for use on hard, soft, animal and human surfaces.[0004]2. Description of Related Art[0005]Currently, hypohalite based cleaners achieve great efficacy for cleaning, bleaching, and disinfection. However, these cleaners have some negative side effects. Hypohalite based cleaners typically contain strong bleaching species and have certain undesirable side effects associated with their use such as strong odors, tendency to overbleach, surface corrosion, and a tendency to leave behind chlorinated species, such as chloramines, which leave an unpleasant odor after tr...

Claims

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Application Information

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IPC IPC(8): C11D3/395A01N59/00
CPCB65D25/08C11D3/10C11D3/0042C11D3/048C11D3/3956C11D17/041C11D3/3951A01N59/00C11D7/10B65D25/04C11D3/22B65D85/70B05C9/06C11D7/105C11D3/26C11D3/3955C11D3/3958C11D3/3953C11D3/0047A01N47/44A01N25/32
Inventor GARNER, DEWAINSMITH, WILLIAMHEYMANN, JARED
Owner THE CLOROX CO
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