Microencapsulation formulation of cadusafos

A technology of thiamphenicol and preparations, which is applied in the field of pesticides/nematicides, and can solve problems such as weakening of thiamphenicol toxicity and safe use, etc.

Inactive Publication Date: 2001-09-05
FMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toxicity of sulf

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of 200g / l Sulfamifos Capsule Suspension (CS) Preparation (Preparation PP)

[0035] Stir and heat an appropriate amount of polyvinyl alcohol and water at about 80-90°C for 1 hour to prepare 20% (wt / wt) partially hydrolyzed polyvinyl alcohol (Airvo  203) for standby aqueous solution. Store the cooled solution for later use.

[0036] In a 4-liter stainless steel beaker, 92 grams of 20% polyvinyl alcohol aqueous solution, 68.6 grams of 2% xanthan gum (Kelzan  S) aqueous solution, and 8.2 grams of polydimethylsiloxane anti-foaming agent (Dow Corning  1520) were mixed in 1832 grams of water to prepare the aqueous phase of the microcapsules. 332.5 grams of this mixture was then transferred to a 1 liter beaker. The mixture was mixed at high speed for 1 minute, then 140.0 grams of premixed sulfamidophos solution (previously treated with 2.5% copper naphthenate), 60.0 grams of white spirit (C 9 -C 15 Naphthalene aromatics, mixture of hydrocarbons, flash point...

Embodiment 2

[0038] Mass Preparation of 200g / l Sulfamifos Capsule Suspension (CS) Preparation (Preparation PB-8PG)

[0039] 2.09 lbs of polyvinyl alcohol dissolved in 226.2 lbs of water, 0.16 lbs of 2% xanthan gum in water, 0.9 lbs of dimethicone anti-foaming agent, 7.62 lbs of sodium salt of alkyl naphthalene sulfonate, and 0.07 lbs. A solution of pounds of 1,2-benzisothiazol-3-one fungicide was placed in a 120 gallon stainless steel vessel and stirred at 80°C for 1 hour. Thereafter, the solution was cooled to 20°C and placed in a 120 gallon stainless steel batch homogenizer. Bring the homogenizer to a speed of approximately 3,500 rpm, and then feed premixed 82.6 lbs of technical grade sulfamidophos (treated with 2.1 lbs of copper naphthenate) and 15.1 lbs of PMPPI to the homogenizer at a pressure of 10 pounds per square inch. in the carburetor. Homogenize the mixture for about 1 minute. After homogenization was complete, the mixture was quickly added dropwise to a 100-gallon stainless...

Embodiment 3

[0041] Mass Preparation of 200g / l Sulfamifos Capsule Suspension (CS) Preparation (Preparation PB-C14U-ND)

[0042] Premixed 172.6 lbs of technical grade sulfamidophos (treated with 4.21 lbs of copper naphthenate), 53.0 lbs of PMPPI, and 74.1 lbs of white spirit (C 9 -C 15 A mixture of aromatics and hydrocarbons without naphthalene, flash point 95°C) solution added to a 120-gallon stainless steel batch homogenizer, 7.24 lbs of polyvinyl alcohol, 0.32 lbs of 2% xanthan gum dissolved in 391.3 lbs of water water solution, 3.33 lbs of polydimethylsiloxane anti-foaming agent (Dow Corning  1520), 7.53 lbs of sodium salt of alkyl naphthalenesulfonate, and 0.20 lbs of 1,2-benzisothiazol-3-one fungicide. After the addition was complete, the mixture was stirred in the homogenizer at about 3,500 rpm for about 10 minutes. After homogenization was complete, an amine mixture consisting of 33.3 lbs of 70% HDA in water dissolved in 12.3 lbs of water was quickly added. After the amine addi...

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Abstract

Pesticidal formulations of cadusafos are provided. An aqueous capsule suspension is provided, containing from about 150 to about 360 grams of cadusafos per liter of formulation and having lower mammalian toxicity than aqueous cadusafos microemulsion formulations is prepared by interfacial polymerization of a first polyfunctional compound, such as a polymethylene polyphenyl isocyanate, with a second polyfunctional compound, such as a polyfunctional amine or mixtures of polyfunctional amines, in an aqueous phase optionally containing from about 0.05 to about 0.50 xanthan gum viscosity modifier/stabilizer. A granular form of the microencapsulated cadusafos is also provided. Several such formulations and the method of their preparation are described.

Description

field of invention [0001] The present invention relates to organophosphate pesticide formulations. In particular, the present invention relates to microencapsulated formulations of the pesticide / nematicide, sulfamifos, which are equivalent to conventional formulations but with reduced toxicity. Background of the invention [0002] The organophosphate compound S,S-di-sec-butyl-O-ethyl dithiophosphate (cadusafos), is an effective pesticide and nematicide. However, the toxicity of sulfamidophos impairs its safe use. For example, the 100 g / l aqueous microemulsion formulation of sulfamidophos currently in commercial use recommends that the user wear full protective clothing to handle and apply the formulation. Labeling also states that the preparation is highly toxic to mammals, fish, arthropods and birds. [0003] Therefore, there is a need to develop a thiamephos formulation that maintains the effectiveness of thiamephos as a pesticide or nematicide while reducing toxicity t...

Claims

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Application Information

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IPC IPC(8): B01J13/16A01N25/04A01N25/12A01N25/28A01N57/12A01P7/02A01P7/04C07F9/17
CPCA01N57/12A01N25/28A01N2300/00
Inventor F·T·H·李P·尼科尔森J·索阿莫斯W·T·萨默
Owner FMC CORP
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