Method for improving the stability of detergent bleach compositions
AssigneeAmerican Cyanamid Company
InventorFrederick George Villaume
Life of this patent
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Abstract
The storage stability of detergent compositions comprising an inorganic peroxygen bleaching compound, such as sodium perborate, and, as an activator therefor, a substituted halotriazine compound, such as 2,4-dichloro-6-bis(hydroxyethyl)amino-s-triazine, is markedly improved if the composition is prepared by spray-drying a water slurry of the detergent and the activator compound and then dry-blending said mixture with the inorganic peroxygen bleaching compound.
Claims3
A method for the preparation of storage-stable detergent bleaching compositions containing an inorganic peroxygen bleach compound and, as an activator therefore, a substituted halotriazine compound represented by the formula:
- ##SPC2##
- where X represents chlorine or bromine;
- and R.sub.1 and R.sub.2 individually represent chlorine, bromine, hydroxy, mercapto, lower alkyl, lower alkoxy, phenoxy, dimethoxyphosphinyl, or ##EQU2## where R.sub.3 and R.sub.4 individually represent hydrogen, lower alkyl, lower cyanoalkyl, lower hydroxyalkyl or phenyl, or where R.sub.3 and R.sub.4 taken together complete a heterocyclic ring selected from morpholine, piperazine and piperidine rings;
- said method comprising forming an aqueous slurry of a detergent composition and said substituted halotriazine compound having a solids content in the range of about 50% to 65%, de-aerating and spray-drying said slurry using a counter-current air flow at an inlet temperature of about 350.degree.C. to 400.degree.C., an outlet temperature of about 90.degree.C. to 110.degree.C. and a nozzle atomizing pressure in the range of 30 to 60 atmospheres, to provide a composition with a moisture content in the range of about 8 to 13% and a bulk density in the range of about 0.30 to 0.35 gram/cm.sup.3 ;
- dry blending said dried composition with said inorganic peroxygen bleach compound to provide in the storage-stable detergent composition a mole proportion of activator to peroxygen compound in the range of about 1:1 to 1:10.
Dependencies are inferred from the claim text.