Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-06-28
1998-12-22
Fries, Kery A.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510236, 510237, 510392, 510393, 510320, 510321, 510530, C11D 3386, C11D 337, C11D 320
Patent
active
058519734
DESCRIPTION:
BRIEF SUMMARY
The formulator of a manual dishwashing detergent composition faces the challenge of deriving a formulation which meets a number of distinct consumer relevant performance demands.
Firstly, such a composition should be effective at removing soils from dirty "dishes" when used in a manual dishwashing process. The term "dishes" is used herein in a generic sense, and encompases essentially any items which may be found in a dishwashing load, including chinaware, glassware, plasticware, hollowware and cutlery, including silverware.
The soils encountered in dishwashing will largely but not exclusively be food based. Particularly difficult soils to remove would include greasy soils, burnt or baked on food soils, dried on food soils, highly coloured soils derived from eg: highly coloured vegetables such as beetroot and tomato, as well as non-food soils such as lipstick on the rims of glasses or nicotine stains on saucers which have been used as ashtrays.
Once the soils has been removed from the dishes the dishwashing detergent should act such as to suspend these soils in the wash solution and thus prevent their redeposition onto the dishes, or onto the surface of the sink.
Whilst good soil removal and antiredeposition are performance demands shared with compositions formulated for machine dishwashing purposes, the manual dishwashing formulator is faced with meeting other performance demands.
For example, the manual dishwashing composition should be high sudsing and the sudsing should persist throughout the washing process. The sudsing is used as an indicator by the person doing the washing up that the wash solution still contains active detergent ingredients. When the sudsing subsides the sink will generally be emptied and a fresh wash solution prepared. The persistence of suds throughout the washing process is measured in the industry by various suds mileage indices.
The manual dishwashing composition should also be mild to the skin, and particularly to the hands. That is, it should not cause skin dryness, chapping or rougness when in contact with the skin. Such skin dryness, chapping or roughness largely results from the removal of natural oils, specifically epidermal lipids, from the skin. Thus, the manual dishwashing composition should desirably be effective at removing grease from plates but not epidermal lipids from the skin.
Reflecting the different nature of the performance demands for a manual dishwashing composition, such compositions are formulated in a distinct way from, for example, machine dishwashing, laundry, and hard surface cleaner compositions.
Manual dishwashing compositions are usually unbuilt, and may contain added levels of Ca and Mg to aid cleaning performance. Laundry and automatic dishwashing compositions typically contain high levels of builder.
Manual dishwashing compositions typically contain no bleaching components, which are by contrast common components of laundry, machine dishwashing and hard-surface cleaner compositions.
Manual dishwashing detergent typically contain high levels of high-sudsing surfactant and often suds booster. Machine laundry and dishwashing compositions are desirably low foaming and typically contain lower levels of surfactant.
Manual dishwashing compositions are formulated to perform well at near neutral pH. Machine dishwashing and laundry compositions are typically alkaline with a pH of usually 9-11. Bleach-containing hard-surface cleaner compositions are often acidic with a pH of less than 6.
The key active component of a manual dishwashing composition is most usually a surfactant system, which will typically comprise from 5 to 80% by weight of the composition. The surfactant system has a primary soil removal purpose, and also acts so as to suspend the soils in solution and prevent redeposition of these soils. In particular, the surfactant system should be effective at removing and suspending greasy soils.
Amylolytic, proteolytic and lipolytic enzymes are common components of laundry and machine dishwashing compositions, formulated in either granular or fluid
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Fries Kery A.
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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