ES363076A1 - Procedure for preparing granular detergents. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A granular washing agent comprises an organic detergent, an inorganic or organic cleaning salt and particles of a powder containing the cleaning salt and optionally the detergent having a bulk density of 100-900 g./l. and coated with a mixture of an enzyme and a salt containing water of crystallization, the salt melting at a temperature of 30-60 C. The detergent may be one or more anionic, non-ionic or ampholytic surface active agents. Cleaning salts may be various alkali metal phosphates or polyphosphates. The particles may be prepared by spray-drying aqueous suspensions, by introducing gas-forming substances into crystallizing pastes of the components by granulation or by fluidized bed processes. The washing agent may also contain sequestering agents, silicates, foam stabilizers or inhibitors, greying inhibitors, optical brighteners, bleaches (per-compounds), perfumes, dyes, or biocidal agents. Hydrated salts may be alkali metal phosphates, sulphates, thiosulphates or carbonates. The enzyme is usually a mixture of enzymes of bacterial or animal gastric origin, and may include proteases, carbohydrases, esterases, oxidoreductases, catalases, peroxidases, ureases, desmolases, isomerases and nucleases. The coating mixture may also contain non-ionic condensates of ethylene oxide with higher alcohols or alkylphenols and/ or alkali metal benzene-, toluene- or xylene-sulphonates, and additives such as perfumes, dyes, biocides, foam inhibitors and cosmetic agents. The particles are coated by admixture, preferably by spraying, with a suspension of the enzyme in the melted hydrated salt or in an aqueous slurry formed by mixing the anhydrous salt with an excess of water, and if necessary, drying the resulting granules.