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US 4,820,441 AGranted
Process for the preparation of a granular detergent composition
AssigneeLever Brothers Company
InventorsElfed H. Evans, Peter C. Knight
Life of this patent
Estimating the term…
Abstract
Granular spray-dried detergent compositions containing a crystal-growth-modified carbonate-based structurant salt are produced by a process in which separate slurries of the structurant salt and of the main detergent composition are prepared in different vessels, then mixed and spray-dried. The structural salt is preferably the sodium carbonate/sodium sulphate double salt Burkeite, crystal-growth-modified by means of a polymeric polycarboxylate.
Claims9
A process for the preparation of a granular detergent composition, which comprises the steps of:
- (i) preparing a first aqueous slurry in a first vessel, the slurry comprising a carbonate-based salt selected from the group consisting of sodium carbonate monohydrate, hydrated sodium carbonate/sodium bicarbonate double salt, anhydrous sodium carbonate/sodium sulfate double salt, and mixtures thereof, and an effective amount of a crystal growth modifier which is an organic material having at least three carboxyl groups in the molecule, the crystal growth modifier being incorporated in the slurry not later than the sodium carbonate;
- (ii) preparing a second aqueous slurry in a second vessel, the slurry comprising a surfactant selected from the group consisting of anionic surfactants, nonionic surfactants, and mixtures thereof;
- (iii) mixing the first and second slurries and spray-drying the resultant mixed slurry to form a powder including a crystal-growth-modified carbonate-based salt.
Dependencies are inferred from the claim text.