C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 3/395 (2006.01) C11D 3/39 (2006.01) C11D 17/06 (2006.01)
Patent
CA 2096255
Disclosed is a process for making nonphosphated automatic dishwashing detergents which have granular form and comprise a conventional nonphosphorus builder system consisting essentially of an organic builder salt (such as citrate) and a dispersant (such as a polyacrylate); and an oxygen bleach system comprising a chelant (such as ethylenediamine disuccinate) and a bleach active (such as perborate or percarbonate) optionally with enzymes and/or dry-mixed hydrous silicates. The invention secures stable, free-flowing granules by a premix step in which the chelant and dispersant are brought together; a drying step using conventional equipment; and one or more admix steps in which the bleach active is mixed with the product of the drying step.
Préparation de détergents granulaires non phosphatés pour lave-vaisselle; ils renferment un système renforçateur non phosphoré, classique, constitué essentiellement d'un sel renforçateur organique (comme un citrate) et d'un dispersant (comme un polyacrylate), un système de blanchiment à l'oxygène renfermant un chélateur (comme le disuccinate d'éthylènediamine) et un activateur de blanchiment (comme le perborate ou le percarbonate) avec, facultativement, des enzymes et (ou) des silicates hydratés. On obtient des granules s'écoulant librement, grâce à une étape de prémélange, où le chélateur et le dispersant sont réunis; une étape de séchage utilise du matériel classique, et une ou plusieurs étapes d'addition permettent de mélanger l'activateur au produit du séchage.
Marshall Janet L.
Painter Jeffrey D.
St. Laurent James C. T. R. B.
Kirby Eades Gale Baker
The Procter & Gamble Company
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