Nonphosphated automatic dishwashing compositions with oxygen bleach systems and process for their preparation
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United States of America Patent
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Mar 8, 1994
Issued Date -
N/A
app pub date -
Jun 29, 1992
filing date -
Nov 14, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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