Insecticidal composition comprising diazinon and process for the preparation thereof
First Claim
1. An insecticidal composition comprising Diazinon encapsulated in an encapsulating wall substantially free of cross linkages formed essentially from the reaction product of toluene diisocyanate and an effectively difunctional amine.
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Abstract
The invention provides an insecticidal composition comprising Diazinon ensulated in microcapsules, the microcapsules having an encapsulating wall formed essentially from the reaction product of toluene diisocyanate and a polyfunctional amine, and further provides a process for encapsulating Diazinon in a microcapsular formulation comprising providing an aqueous phase containing a non-basic emulsifier, providing an organic phase containing toluene diisocyanate and Diazinon, combining the aqueous and organic phase to form an oil in water emulsion, and adding an aqueous solution of a polyfunctional amine with agitation to the emulsion, whereby the amine reacts with the toluene diisocyanate to form microcapsular envelopes about the Diazinon material.
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6 Claims
- 1. An insecticidal composition comprising Diazinon encapsulated in an encapsulating wall substantially free of cross linkages formed essentially from the reaction product of toluene diisocyanate and an effectively difunctional amine.
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3. A process for encapsulating Diazinon in a microcapsular formulation comprising:
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(a) providing an aqueous phase containing a non-basic emulsifier; (b) providing an organic phase containing toluene diisocyanate and Diazinon; (c) combining said aqueous and organic phase to form an oil in water emulsion; and (d) adding an aqueous solution of an effectively difunctional amine with agitation to said emulsion, whereby said amine reacts with said toluene diisocyanate to form microcapsular envelopes substantially free of cross linkages. - View Dependent Claims (4, 5, 6)
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Specification