Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1995-12-11
1997-11-25
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510350, 510356, 510441, 510442, 510443, 510444, 510501, 510506, 510507, 510511, C11D 1706, C11D 312, C11D 332, C11D 1100
Patent
active
056912943
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to the use of flow aids for granular products which comprise a mixture of sodium aluminosilicate and silica in a narrowly defined ratio. The silica used is hydrophobic silica, preferably fumed hydrophobic silica. The ratio of sodium aluminosilicate to silica is from about 100:1 to about 3:1, preferably from 20:1 to 5:1, and most preferably around 10:1.
The flow aid is used in the process of manufacturing high density granular detergent components or compositions which comprise nonionic surfactants. It is most useful in combination with nonionic surfactants which are liquid at ambient temperature, and are therefore mobile. Without a suitable flow aid, the nonionic surfactant tends to leak from the powder and soak into the cardboard container which forms an unsightly stain. Although it is possible to avoid this problem by using lower levels of nonionic surfactant in the composition, or by selecting nonionic surfactants which have a lower solidification temperature, this limits the flexibility of formulation.
The use of flow aids in general which help to reduce the stickiness of detergent granules comprising nonionic surfactants, and which may help to increase bulk density is known, for example from the following prior art:
U.S. Pat. No. 3,868,336, published on 25th Feb., 1975, claims blends of detergent compositions with 0.5% to 15% by weight of a particulate water-insoluble flow-promoting agent for lessening, or eliminating caking, stickiness, and oiling out when an oily liquid detergency improver is applied. Although this patent discloses various flow-promoting agents, it does not disclose the advantages to be gained from mixing specific ratios of hydrophobic silica and aluminosilicates.
JP 61 069897, laid open 10th Apr., 1986 states that aluminosilicate, silicon dioxide, bentonite and clay having am average particle diameter of not more than 10 micrometers can be used as a surface modifier at a level of from 0.5% to 35%.
EP 0 351 937, published 24th Jan., 1990 and EP 0 352 135, published 24th Jan., 1990 disclose agglomeration processes carried out sequentially with high speed and low speed mixing. No finely divided particulate is present is the granulation step. However flow aids may be used, for example, aluminosilicates, precipitated silica and others are suitable.
EP 0 513 824, published 19th Nov., 1992, describes a process for making nonionic detergent granules and the use of a surface coating agent having a particle size of less than 10 micrometers.
In general, the prior art does not distinguish between the different types of silica which may be advantageously used as flow aids. In many cases the use of precipitated silicas is described. However, the majority of precipitated silicas which are commercially available are hydrophilic, and are therefore not useful in the present invention.
The present invention is aimed at making nonionic detergent agglomerates having a high bulk density and which comprise higher levels of nonionic surfactant than those of the prior art, but do not have the same leakage problems.
Another problem which is associated with making detergent agglomerates having a high bulk density is that the bulk density tends to change during storage, especially during the first few hours or days after manufacture. This in turn gives rise to problems of quality control, especially on packaging lines. It is a feature of the products of the present invention that changes in bulk density during storage are greatly reduced, or even eliminated.
The present invention also addresses the problem of achieving more control over particle size distribution of the finished product. One of the factors influencing particle size distribution is the effectiveness of the flow aid which is introduced near to the end of the manufacturing process. The flow aids of the present invention have been found to be more efficient in this regard.
SUMMARY OF THE INVENTION
The present invention relates to detergent components or compositions having a bulk densi
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France Paul Amaat Raymond Gerard
Van Dijk Paul Irma Albertus
Hertzog Ardith
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Yetter Jerry J.
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