Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-03-19
1998-10-20
Einsmann, Margaret
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510375, 510402, C11D 718, C11D 724, C11D 732
Patent
active
058246304
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to machine dishwashing detergent compositions exhibiting superior anti silver-tarnishing properties.
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 composition on dishes and glassware, as reflected by numerous patent publications.
The present invention is concerned with silverware washed in automatic dishwashers, and in particular with the silver-tarnishing problem encountered with current detergent compositions for use in said automatic dishwashers, such as "compact" granular products, and being based on oxygen-bleaching species.
It has been found that the compositions of the present invention can provide excellent anti-silver tarnishing properties, as well as optimal cleaning/rinsing performance on dishes and glassware; The present compositions are based on oxygen-bleaching species, and preferably are in a compact form. The optimum anti-silver tarnishing as well as cleaning/rinsing performance is achieved through the combined use of paraffin oil and defined nitrogen-containing corrosion inhibitor compounds, as well as preferably the control of oxygen-bleaching power.
EPA 150 387 discloses chlorine-bleach-based machine dishwashing compositions containing a paraffin oil as suds suppressor; EPA 186 088 discloses machine dishwashing compositions based on carbonates and silicates, containing paraffin oils as dust binders, and water-soluble phosphonates at levels of 0.5 to 3%.
SUMMARY OF THE INVENTION
A machine dishwashing composition comprising paraffin oil.
In a highly preferred execution of the invention the oxygen-releasing bleaching agent is incorporated such that the level of available oxygen measured according to the method herein is from 0.3 to 1.7, preferably 0.5 to 1.2
BRIEF DESCRIPTION OF THE DRAWINGS
The FIGURE represents a graph of available oxygen level versus time.
DETAILED DESCRIPTION OF THE INVENTION
The present compositions contain as essential components detergent builder compound, oxygen-releasing bleaching species, the level of available oxygen most preferably being controlled, paraffin oil, and nitrogen-containing corrosion inhibitor compound.
Builder
The first essential component of the machine dishwashing (or rinsing) detergent composition of the present invention is detergent builder compound present at a level of from 1% to 80% by weight, preferably from 10% to 70% by weight, most preferably from 20% to 60% weight of the composition.
Suitable detergent builder compound is largely or wholly water-soluble, and can, for example, be selected from monomeric polycarboxylates, or their acid forms homo or copolymeric polycarboxylic acids or their salts in which the polycarboxylic acid comprises at least two carboxylic radicals separated from each other by not more that two carbon atoms, carbonates, bicarbonates, borates, phosphates, silicates and mixtures of any of the foregoing.
Suitable water-soluble monomeric or oligomeric carboxylate builders can be selected from a wide range of compounds but such compounds preferably have a first carboxyl logarithmic acidity/constant (pK.sub.1) of less than 9, preferably of between 2 and 8.5, more preferably of between 4 and 7.5.
The logarithmic acidity constant is defined by reference to the equilibrium
The equilibrium constant for dilute solutions is therefore given by the expression ##EQU1## and pK.sub.1 =log.sub.10 K.
For the purposes of this specification, acidity constants are defined at 25.degree. C. and at zero ionic strength. Literature values are taken where possible (see Stability Constants of Metal-Ion Complexes, Special Publication No. 25, The Chemical Society, London): where doubt arises they are determined by potentiometric titration using a glass electrode.
The carboxylate or polycarboxylate builder can be monomeric or oligomeric in type although monomeric polycarboxylates are generally p
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Christie Julie Ann
MacBeath Fiona Susan
Turner John Christopher
Einsmann Margaret
Khosla Pankaj M.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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