Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-04-18
1998-07-07
McGinty, Douglas J.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510375, 510376, 510461, C11D 724, C11D 754
Patent
active
057768749
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to detergent compositions, suitable for use in machine dishwashing, exhibiting good bleachable stain removal and enhanced anti silver-tarnishing properties, and to a process for making said compositions.
BACKGROUND OF THE INVENTION
Detergent 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 detergent 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 control of the rate of release of the oxygen bleach and the inclusion into the detergent compositon of an agent which can form a protective coating on the silverware in the wash. Paraffin has been found to be a suitable coating material.
The rate of release of oxygen bleach should be rapid enough to provide satisfactory cleaning, but not so rapid that tarnishing is enabled. It is the Applicant's finding that it is necessary for the release of the oxygen bleach to be delayed in order to allow a protective paraffin coating of the silverware to form. This coating protects the silver surface from the potential tarnishing effect of the oxygen bleach species.
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 invention also encompasses a making process for the detergent compositions herein, which optimizes the anti silver-tarnishing performance of the resulting product.
EPA 150 387 discloses chlorine-bleach based machine dishwashing compositions containing a paraffin wax as suds suppressor. EPA 186 088 discloses machine dishwashing compositions based on carbonates and silicates and optionally chlorine or oxygen bleaches, containing paraffin oils as dust binders. None of these references disclose the control of the rate of release of the bleach systems.
SUMMARY OF THE INVENTION
According to the present invention there is provided a detergent composition containing paraffin oil. measured according to the method herein is from 0.3% to 2.5%, preferably 0.5% to 1.7% wherein 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.
BRIEF DESCRIPTION OF THE DRAWINGS
The FIGURE r
REFERENCES:
patent: 4192761 (1980-03-01), Peltre et al.
patent: 4194986 (1980-03-01), Tournier et al.
patent: 4237024 (1980-12-01), Fedechko
patent: 4568476 (1986-02-01), Kielman et al.
patent: 4599189 (1986-07-01), Wuhrmann et al.
patent: 4619779 (1986-10-01), Hardy
patent: 4620936 (1986-11-01), Kielman et al.
patent: 4820440 (1989-04-01), Hemm et al.
patent: 4859358 (1989-08-01), Gabriel et al.
patent: 5008031 (1991-04-01), Schulz et al.
patent: 5045225 (1991-09-01), Aronson et al.
patent: 5328489 (1994-07-01), Beaujean et al.
patent: 5482642 (1996-01-01), Agar et al.
Jones Lynda Anne
MacBeath Fiona Susan
Turner John Christopher
Allen George W.
Bolam Brian M.
Dusheck Caroline L.
McGinty Douglas J.
The Procter & Gamble & Company
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