Machine dishwashing composition containing oxygen bleach and par

Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...

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Details

252387, 252390, 252397, 252401, 510108, 510226, 510375, 510378, 510461, C11D 318, C11D 328, C11D 339, C23G 118

Patent

active

056985045

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to bleaching compositions, suitable for use in machine dishwashing, exhibiting good bleachable stain removal and enhanced anti silver-tarnishing properties.


BACKGROUND OF THE INVENTION

Compositions designed for use in automatic dishwasher machines are well known, and a consistent effort has been made by detergent manufacturers to improve the cleaning and/or rinsing efficiency of said compositions on dishes and glassware, as reflected by numerous patent publications.
The present invention is concerned with the silver-tarnishing problem encountered when bleaching compositions which contain oxygen-bleaching species are employed in machine dishwashing methods.
The satisfactory removal of bleachable soils such as tea, fruit juice and coloured vegetable soils, such as carotenoid soils is a particular challenge to the formulator of a machine dishwashing composition. Traditionally, the removal of such soils has been enabled by the use of bleach components such as oxygen and chlorine bleaches.
A problem encountered with the use of such bleaches is the tarnishing of any silverware components of the washload. Oxygen bleaches tend to give rise to the problem of tarnishing more than chlorine bleaches. The level of tarnishing observed can range from slight discolouration of the silverware to the formation of a dense black coating on the surface of the silverware.
The formulator thus faces the dual challenge of formulating a product which maximises bleachable soil cleaning but minimises the occurrence of tarnishing of silverware components of the washload.
The Applicants have found that the problem of tarnishing can be particularly severe when an oxygen bleaching species is employed especially when the formulation has a pH below 9.6. Oxygen bleaching species are however, preferred over chlorine bleaches for reasons of environmental compatibility.
It has been found that enhanced anti-silver tarnishing as well as good cleaning performance can be achieved through the combined use of a paraffin oil, a benzotriazole compound, and preferably control of oxygen-bleaching power.
Preferably, the rate of release of the oxygen bleach is also controlled. The rate of release of oxygen bleach is preferably rapid enough to provide satisfactory cleaning, but not so rapid that tarnishing is enabled. In particular, the rate of release of any organic peroxyacid species to the wash solution is preferably controlled.
It is an object of the present invention to provide compositions, suitable for use in machine dishwashing methods, having enhanced anti-silver tarnishing properties, as well as good cleaning performance, particularly bleachable soil removal performance.
The present compositions are based on oxygen-bleaching species, and preferably are in a compact form and have a pH of 9.6 or greater.
EPA 150 387 discloses chlorine-bleach based machine dishwashing compositions containing a paraffin wax as suds suppressor. EPA 180 088 discloses machine dishwashing compositions based on carbonates and silicates, containing paraffin oils as dust binders.


SUMMARY OF THE INVENTION

There is provided a bleaching composition containing paraffin oil. 0.05% to 0.5% by weight of a benzotriazole compound.
Preferably, said oxygen-releasing bleaching agent is incorporated such that the level of available oxygen measured according to the method herein is from 0.3% to 2.5%, preferably 0.5% to 1.7% by weight.
Preferably, the rate of release of said available oxygen is such that the available oxygen is completely released from the composition in a time interval of from 3.5 minutes to 10.0 minutes, using the test protocol described in the present description.
There is also provided a detergent composition containing a detergent component preferably selected from a detergent builder compound and a surfactant, and additionally containing the bleaching composition of the invention.


BRIEF DESCRIPTION OF THE DRAWINGS

The FIGURE represents a graph of available oxygen level versus time.


DETAILED DESCRIPTION OF THE

REFERENCES:
patent: 4620936 (1986-11-01), Kielman et al.
patent: 4919834 (1990-04-01), Chen et al.
patent: 5089162 (1992-02-01), Rapisarda et al.

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