Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1989-02-03
1991-09-17
Lee, Lester L.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71 88, 71 3, 71100, 71DIG1, 71118, 71121, 424489, 424419, 424497, 428402, 4284022, 42840224, A01N 2528
Patent
active
050491822
ABSTRACT:
Microcapsule formulations are combined with emulsions or particle dispersions in a single-package formulation which is storage-stable and provides substantially the full efficacy of each of the two forms as if applied individually. The single-package formulation is suspension having two dispersed phases--the first being an active species encapsulated in a shell of inert polymeric diffusion-limiting material (i.e., a microcapsule), and the second being an active species in water-insoluble form with no diffusion-limiting barrier at its surface. An appropriate suspension system is included to prevent the dispersed phases from agglomerating within themselves and with each other. The invention is useful in combining two different active ingredients as well as in combining immediate-delivery and delayed-delivery forms of the same active ingredient. The invention may for example involve combining a biocide with an activity modifier such as a safener, with the effect of lowering the needed amount of one or the other by removing it to a separate phase. In certain cases, a unique combination of surface-active agents maintains the phases in suspension.
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Calvo Jose L.
Gimeno Miguel
Rodson Marius
Scher Herbert B.
ICI Americas Inc.
Kraus E. J.
Lee Lester L.
Marcus-Wyner Lynn
Polyn Denis A.
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