Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-07-30
1998-05-26
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510310, 510315, 510318, 510349, 510361, 510377, 510438, 510441, 510442, 510443, 510444, 510445, 510452, 510495, 510507, 510532, C11D 1700, C11D 114, C11D 312, C11D 1706
Patent
active
057564450
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a granular detergent component having a bulk density of less than 400 g/l which comprises an anionic surfactant, zeolite, and, optionally, a co-filler. The invention also concerns a granular laundry detergent composition comprising the low bulk density component and, additionally, high density granular components, preferably including percarbonate.
In conventional processes for preparing granular laundry detergents, spray drying of an aqueous slurry has been used to prepare granular components having a rather wide range of bulk densities depending on factors such as choice and level of ingredients used in the slurry, and processing conditions in the spray drying tower. However spray dried products on their own do not have high enough bulk density for todays granular detergents.
Recent trends in granular laundry detergents have seen increases in the bulk density of the finished products. Such high bulk densities offer greater convenience to the consumer, and environmental benefits due to, for example, reduced packaging requirements. These densities have been achieved by preparing and combining individual detergent components having high bulk densities. Combinations of spray dried powders with other granular components are known in the prior art, some examples of which are cited below.
EPA289312, published Nov. 2, 1988 discloses a process for the spray-drying of an aqueous slurry which contains carbonate and a crystal growth modifier. Optional post-treatments include spraying on of nonionic surfactant and mixing with other components including bleach, bleach activator, enzymes, etc. Such components require the presence of relatively high levels of organic materials, in particular anionic surfactants (in this application surfactants are present at a level of at least 5% by weight).
W09303131, published on Feb. 18, 1993 discloses a spray dried component which comprises alkyl sulphate, aluminosilicate and silicate. Certain ratios of the components as well as processing conditions are specified. The spray dried component is then mixed with bleach, bleach activator, foam inhibitor, enzymes etc. The application considers the problem of replacing linear alkyl benzene sulponate (LAS) by the more biodegradable alkyl sulphates. Such components are difficult to spray dry and require the introduction of specific process parameters such as low temperature spray drying.
High bulk density components which are desirable in todays granular detergents, such as carbonate, percarbonate and silicate, do not offer the detergent formulator much flexibility in terms of finished product bulk density. A low bulk density spray-dried component, however, which could be blended with the high bulk density components would offer greatly increased flexibility in terms of achieving the desired final product density. Such flexibility arises from the possibility to vary parameters such as the composition of the aqueous slurry prior to spray drying, the parameters of the spray drying process and the ratio of the low bulk density component to the high bulk density components which may be used.
It is the aim of the present invention to provide a spray-dried component having a bulk density of less than 400 g/l which contains a low level of organic material. The organic material facilitates the production of spray dried components having good physical properties, and which can be made at a low bulk density without loss of quality. The organic material chosen for use in the present invention is low levels of surfactant, preferably anionic surfactant at a level of from 0.05% to 2% by weight, which has a Krafft point of at least 30.degree. C.
A second aspect of the present invention is to provide a finished composition which comprises the low bulk density spray-dried component, together with additional higher bulk density components.
A third aspect of the present invention is to provide spray-dried components which are low in moisture content, and which have a high capacity for moisture uptake. Such components, when combined wit
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Dorset Andrew
Hall Robin Gibson
Hertzog Ardith
Patel Ken K.
Rasser Jacobus C.
The Proctor & Gamble Company
Zerby Kim W.
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