Process for manufacture of detergent powders
AssigneeLever Brothers Company
InventorRaymond J. Wilde
Life of this patent
Estimating the term…
Abstract
The invention relates to the preparation of spray-dried powders of low bulk density. Fabric washing powders containing nonionic surfactants as the major or sole detergent-active species have unacceptably high natural bulk densities (about 0.6 g/l). It has been found that the incorporation of certain alkenyl succinate salts into the crutcher slurry can reduce the bulk density of the resultant spray-dried powder. There is also a need for absorbents of low bulk density for manufacturing nonionic-surfactant based powders by dry-mixing routes and it has been found that suitable absorbents can be prepared by adding alkenyl succinate to a slurry of the chosen ingredients and spray-drying.
Claims7
A process for the manufacture of a detergent powder comprising the steps of
- (a) forming an aqueous slurry comprising an ingredient of sodium tripolyphosphate, sodium pyrophosphate, sodium orthophosphate, sodium carbonate, sodium silicate or sodium sulphate, or a mixture thereof, and from 1/2 to 5% by weight of said ingredient of a mono- or di-alkali metal or ammonium salt of a dicarboxylic acid of the general formula R.CH(COOH). (CH.sub.2).sub.n.COOH where n is 0 or 1, and R is a primary or secondary straight chain alkyl or alkenyl group containing from 10 to 20 carbon atoms;
- (b) spray drying the resultant slurry to form a spray dried powder;
- and
- (c) combining said spray dried powder with a C.sub.7 to C.sub.24 primary or secondary alcohol ethoxylated with from 1 to 20 moles of ethylene oxide per mole of alcohol.
A process for the manufacture of a detergent powder comprising the steps of
- (a) forming an aqueous crutcher slurry comprising an ingredient of sodium tripolyphosphate, sodium pyrophosphate, sodium orthophosphate, sodium carbonate, sodium silicate or sodium sulphate, or a mixture thereof, from 5 to 15%, based on the weight of the detergent powder, of a primary or secondary C.sub.7 to C.sub.24 alcohol ethoxylated with from 1 to 20 moles of ethylene oxide per mole of alcohol, and from 1/2 to 5% by weight of said ingredient of a mono- or di-alkali metal or ammonium salt of a dicarboxylic acid of the general formula R.CH(COOH).(CH.sub.2).sub.n.COOH where n is 0 or 1, and R is a primary or secondary straight chain alkyl or alkenyl group containing from 10 to 20 carbon atoms;
- and
- (b) spray drying the resultant slurry to form a spray dried powder.
Dependencies are inferred from the claim text.