Lever Brothers Company

Richard L Davies

Michael Curtis

John S Galvin

Christopher C Storer

A process for preparing a detergent powder containing a nonionic surfactant in which the tendency towards autoxidation is reduced by incorporating into the slurry a relatively large amount of an amino compound such as an alkanolamide, an alkanolamine or an amine, for example coconut monoethanolamide or gelatine.

Process for preparing particulate detergent compositions containing

The problem of autoxidation of detergent powders containing relatively large amounts of nonionic surfactants is reduced by incorporating in the crutcher slurry a compound containing a positively charged nitrogen atom. Such compounds should be present in an amount of from 1/2 to 6% of the resultant spray-dried powder. If desired they can be incorporated into the slurry by injection into the high pressure line to the spray-drying tower. Typical compounds containing positively charged nitrogen atoms are quaternary ammonium or organic heterocycle salts, amine oxides and betaines, although quaternary ammonium salts are preferred.

Process of spray drying nonionic surfactant-containing detergents also

Partial salts, particularly alkali metal salts, of polymeric aliphatic carboxylic acids are made by isolation from their aqueous solutions, the degree of neutralisation being not more than about 60%. The partial salts have improved storage properties which facilitates their use, for example in detergent compositions.

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Wirral, United Kingdom

Richard L Davies