Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1999-01-04
2000-12-05
Douyon, Lorna M.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510309, 510315, 510349, 510375, 510378, 510441, 510507, C11D 1100
Patent
active
061567183
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for making detergent compositions
There is a trend amongst commercially available granular detergents towards higher bulk densities. This gives benefits both for consumer convenience and for reduction of packaging materials.
Many of the prior art attempts to move in this direction have met with problems of poor solubility properties arising from low rate of dissolution or the formation of gels. A consequence of this in a typical washing process can be poor dispensing of the product, either from the dispensing drawer of a washing machine, or from a dosing device placed with the laundry inside the machine. This poor dispensing is often caused by gelling of particles which have high levels of surfactant upon contact with water. The gel prevents a proportion of the detergent powder from being solubilised in the wash water which reduces the effectiveness of the powder. Another adverse consequence arises even if the powder is well dispersed and dispersed in the washing water if it does not dissolve rapidly. The wash cycle has a limited duration during which the detergent can act upon the laundry. If the cleaning action is delayed because the powder is slow to dissolve, this, too, will limit the effectiveness of the powder.
The process engineer and formulator have frequently found that the need for good dispensing and the need for good dissolution rate have placed conflicting demands upon them. The solution has generally been to find a compromise which gives adequate dispensing and adequate dissolution rate. For example, poor dispensing of high bulk density granular detergents is often associated with surfactant rich particles having a high specific surface area, either due to high porosity or a small particle size (especially "fines"). However, decreasing the porosity and/or increasing the average particle size cause the dissolution rate to decrease.
W094/05761, published on 17th March 1994, describes a final product densification step wherein substantially all of the product is sprayed with nonionic surfactant and coated with zeolite. Good dispensing and dissolving properties are claimed.
However it has now been found that even further improvements in dispensing and dissolving properties can be achieved if the nonionic surfactant and zeolite coating is applied only to selected parts of the detergent composition, rather than to the detergent composition as a whole.
The object of the invention is to provide an improved process for making a detergent composition comprising anionic surfactant, nonionic surfactant and non-surfactant additives.
SUMMARY OF THE INVENTION
The object of the present invention is achieved by a process comprising the steps of: to form a first intermediate particle; intermediate particle, wherein the second intermediate particle comprises substantially all of the anionic surfactant, and is substantially free of nonionic surfactant.
DETAILED DESCRIPTION OF THE INVENTION
In a preferred embodiment of the process the first intermediate particle is formed by: and surfactant on to the premix and applying a finely divided particulate material, preferably aluminosilicate.
In a still further preferred embodiment of the process the first intermediate particle is formed by: nonionic surfactant to premix is at least 1:25; the ratio of the first amount of finely divided particulate material to nonionic surfactant applied in step (b) is less than 1:1; wherein the second amount of finely divided particulate material to nonionic surfactant applied in step
The process of the invention results in a narrow particle size distribution with a sharply defined mean. Preferably the mean particle size is 800 to 1200 micrometers, and the particle size distribution has a standard deviation of less than 100 micrometers. More preferably the mean particle size is from 900 to 1100 micrometers, and the particle size distribution has a standard deviation of less than 50 micrometers.
Non-surfactant additives may include any detergent additives such as bleach, especially perbora
REFERENCES:
patent: 4136051 (1979-01-01), Saran et al.
patent: 4347152 (1982-08-01), Wixon
patent: 5529715 (1996-06-01), Kuroda et al.
patent: 5691296 (1997-11-01), Agar et al.
patent: 5698510 (1997-12-01), Wilkinson et al.
patent: 5705473 (1998-01-01), Kuroda et al.
patent: 5780410 (1998-07-01), Baillely et al.
Research Disclosure Apr. 1990--Detergent Powder Production--#31210--pp. 358-359.
Donoghue Scott John
Liplijn Marcel Karel Nelis
Wilkinson Carole Patricia Denise
Bolam Brian M.
Douyon Lorna M.
Miller Steven W.
The Procter & Gamble & Company
Zerby Kim William
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