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US 5,691,296 AGranted
Percarbonate bleach particles coated with a partially hydrated crystalline aluminosilicate flow aid
AssigneeThe Procter & Gamble Company
InventorsJoseph Thomas Henry Agar, Paul Amaat Raymond G. France, Carole Patricia D. Wilkinson
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Abstract
A process for making a granular detergent composition comprising the steps of adding to a detergent powder particles of percarbonate having a mean particle size in the range of from 250 to 900 micrometers and a powdery flow aid containing a partially hydrated crystalline sodium aluminosilicate having a moisture content of less than 15%, preferably from 5% to 12%.
Claims17
A process for making a granular detergent composition having a bulk density of at least 650 g/l, which process comprises the steps of:
- a) providing a detergent powder wherein from 1% to 40% by weight of the detergent powder comprises percarbonate particles having a particle size in the range of 250 to 900 .mu.m;
- b) spraying onto said detergent powder a nonionic surfactant;
- and
- c) mixing the product of step b) with a partially hydrated crystalline zeolite having a moisture content of less than 15% by weight of the crystalline zeolite, the crystalline zeolite being employed in an amount sufficient to improve the storage life of the percarbonate particles.
1 more element
Dependencies are inferred from the claim text.