Lever Brothers Company

Lever Brothers Company, Division of Conopco, Inc.

Kil Whan Chun

David S Alterman

David J Lang

Edward Santos

Richard F Theiler

Robert Gabriel

Allan H Gilbert

Mark I Baumgarten

Clemens A Kyllmann

A multilayer detergent tablet containing an outer layer, a barrier layer and an inner layer. The tablet releases sequentially ingredients contained in the outer layer and ingredients contained in the inner layer. The time interval between the release of the outer layer ingredients and the release of the inner layer ingredients is controlled by the particular choice of an ingredient for the barrier layer and the relative thicknesses of the inner layer, the barrier layer and the outer layer. The tablet is able to separate in time the dissolution of incompatible ingredients such as an enzyme and a chlorine bleach. The tablet also provides sequential release of a dishwashing composition and a rinse aid composition such that cleaning is accomplished prior to the release of the rinse aid.

Machine dishwashing detergent tablets

Hard spherical bleaching particles are disclosed the core of each particle comprising a dihalohydantoin bleach active, a buffer salt and a binder which mixture when dissolved in water provides a pH of less than 9.5. The core may be encapsulated within an outer coating. Fabric pinhole damage is substantially reduced when bleaching with the foregoing particles.

Particles containing dihalohydantoin bleach in a diluted core

A bleach particle is provided whose core is an intimately dispersed agglomerated mixture of a halogen bleaching agent, an inorganic phosphate salt and a binder with melting point 85.degree. to 120.degree. F. In the preferred composition there is present dichloroisocyanurate, sodium tripolyphosphate and lauric acid, respectively. These core particles have a uniform round shape, are of high strength and obtainable in good yields.

Particles containing active halogen bleach in a diluted core

Hard spherical bleaching particles are disclosed whose composition is an intimately dispersed agglomerated core mixture of an active halogen oxidizing material, an inorganic diluent salt and a binder. The cores are coated with a mixture of from about 70-85% of a C.sub.16 -C.sub.18 fatty acid soap and from about 15-30% of a C.sub.12 -C.sub.14 fatty acid soap. A method for bleaching substrates as well as a process for preparing the bleach particles are disclosed.

Encapsulated bleach particles coated with a mixture of C.sub.16

Particles of a fluidizable substance are coated with a complete and continuous coating by a process wherein a non-aqueous solution of a coating substance is sprayed from a nozzle downwardly on a fluidized bed of the particles to be coated, the nozzle height being adjusted so that the liquid droplets of coating material would just cover the cross-sectional area of the upper surface of the bed, if sprayed on the unexpanded bed. When the aforementioned coating is a fatty acid having 12-20 carbon atoms applied to particles of a chlorine-releasing agent, and when a second coating is applied by treatment with a solution of a fixed alkali hydroxide, i.e., sodium, potassium, or calcium hydroxide, an effective, completely encapsulated, non-pinholing bleach product is obtained.

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Wyckoff, NJ, United States of America

Kil Whan Chun