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Melt processing of phosphoroamido(di)thioate insecticides

A technology for thiophosphoramidate and pesticides, which is applied in the melting process field of (two) thiophosphoramidate pesticides, and can solve problems such as unacceptable degradation levels

Inactive Publication Date: 2009-08-19
ARYSTA LIFESCIENCE NORTH AMERICA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, long-term stability testing of melt-formed pellets showed unacceptable levels of degradation over unacceptably short periods of time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In this example, permethan was flaked, resulting in stable permethion flakes, which could be dissolved or dispersed in solvents for use according to standard procedures. A mixture was formed containing 92% by weight of technical grade perfenfos and 8% by weight of Maltrin M-100 (maltodextrin). This mixture was added to a mixer with a variable speed screw feeder. The mixture was dropped on a conveyor belt which passed through a heating chamber, thereby heating the mixture to about 90° C. to melt the permethrin under nitrogen. The conveyor belt then passes through a cooling chamber where the permethrin mixture cools and solidifies. The cooling chamber can cool the permethrin mixture by direct dry cold air or by direct flow of oxygen-free air. The conveyor belt may have a series of notches or grooves to create frangible points or lines to help create a uniform particle size.

[0059] The cooled and solidified permethine mixture is removed from the conveyor belt and tran...

Embodiment 2

[0060] The procedure of Example 1 was repeated using 92.0 wt% technical grade perfenfos, silica (trade name HI-SIL233) and 1.0 wt% lemon oil 4136 (masking agent). The resulting product is stable and easily dissolved or distributed, and can be used in agricultural fields.

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Abstract

An insecticide solid or particulate is produced from a phosphoroamido(di)thioate insecticide such as acephate. The particulate insecticide is formed by melting the insecticidal solids in a substantially oxygen-free, and preferably moisture free, atmosphere to prevent oxygen entrainment in the resulting melt to inhibit later degradation upon storage. The melt is formed into granules, extrudates, prills, flakes, shaped briquettes, or other shapes as desired.

Description

[0001] Cross References to Related Applications [0001] This application claims priority to U.S. Invention Patent Application 11 / 518,486, filed September 11, 2006, entitled "(2) Melting Process for Thiophosphoramidate Insecticides," the contents of which are hereby incorporated by reference for all purposes as refer to. technical field [0002] The present invention relates to the preparation of (two) thiophosphoramidate-type insecticides (such as aceton) from the technical grade, crystalline form of the active substance into pellets, flakes, spheres or large granular solids of similar size Craft in solid form. Background technique [0003] N-Alkylthiophosphoramidates and dithiophosphoramidates (herein referred to as "(di)thiophosphoramidates") are a class of heat-sensitive insecticides useful as systemic insecticides in various environments compound. Amethon is one of the most commercially important compounds in this class. Afenfos and related compounds are disclosed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/12A01N57/26A01N57/28
CPCA01N57/28A01N25/02A01N25/34A01N65/00A01N65/36A01N2300/00A01N25/12A01N57/26
Inventor 杰西·盖坦
Owner ARYSTA LIFESCIENCE NORTH AMERICA LLC