Microcapsule clomazone weed killer composition and its preparing process

A technology of microencapsulation and clomazone, applied in botany equipment and methods, biocides, animal repellants, etc., can solve problems such as herbicide restrictions

Inactive Publication Date: 2004-04-28
FMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Microcapsule clomazone weed killer composition and its preparing process

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Embodiment 1

[0015] Preparation of 0.15 kg / L (1.5 lb / gal) Capsule Suspension (1.5CS) Formulation (Formulation A)

[0016] By stirring, an appropriate amount of polyvinyl alcohol and water can be stirred at 80-90 ° C for 1 hour to obtain a stock solution of 20% (w / w) partially hydrolyzed polyvinyl alcohol with an average molecular weight of 13,000 to 23,000 (Airvol  203). Store the cooled solution for later use.

[0017] Put 20.0 grams of the 20% polyvinyl alcohol aqueous solution prepared above, 1.8 grams of 100% polydimethylsiloxane antifoam base (Dow Corning  1500), 15.0 grams of 2% xanthan gum aqueous solution (Kelzan  M) and 400.0 grams of water. The mixture was mixed at high speed in a high shear mixer for 20 seconds before adding premixed 140.0 g of clomazone, 30.0 g of polymethylene polyisocyanate phenyl (PMIPP, Mondur  MR) and 30.0 grams of white spirit (C 9 -C 15 Aromatic, naphthalene-depleted hydrocarbon, flash point 95°C, Armoatic 200ND) solution, the mixture was emuls...

Embodiment 2

[0020] Large-Scale Preparation of 0.2 kg / L (2.0 lb / gal) Clamazone Capsule Suspension (2.0CS) Formulation (Formulation E-1)

[0021] Put 2.38kg (5.24 pounds) 20% polyvinyl alcohol (Airvol 203), 2.38kg (2.38 pounds) 20% polydimethylsiloxane antifoam agent (DowCorning) into a 227 liter (500 gallon) stainless steel kettle  1500) in water and 0.095 kg (0.21 lbs) xanthan gum viscosity modifier / stabilizer (Kelzan  M) A solution in 129.03 kg (284.20 lbs) of water and stirred at 80°C for one hour. The solution was then cooled to 20°C and placed in a 36.32 liter (80 gallon) batch homogenizer. With the homogenizer running, add premixed 73.25 kg (161.34 lbs) of clomazone, 15.78 kg (34.75 lbs) of polymethylene polyisocyanate to the homogenizer by gravity within 15-90 seconds Ester (PMIPP, Mondur  MR) and 15.78kg (34.75 lbs) of white spirit (C 9 -C 15 Aromatic mixture, flash point is 95°C, Armoatic200) solution. The mixture was homogenized for 2-3 minutes. After homogenization was...

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Abstract

An herbicidal composition containing from 1 to 4 pounds of clomazone per gallon of formulation and having a clomazone volatility less than fifty percent of that of an emulsifiable concentrate containing four pounds of clomazone per gallon of formulation is prepared by the interfacial reaction of polymethylene polyphenyl isocyanate with a polyfunctional amine selected from ethylenediamine, diethylenetriamine, triethylenetetramine, 1,6-hexanediamine, and their mixtures in an aqueous phase optionally containing from 0.05 to 0.25 weight percent of a xanthan gum viscosity modified/stabilizer. Several such formulations and the method of their preparation are described.

Description

[0001] This application is a divisional application of the patent application whose application number is CN 95196179.9 and the invention name is "low volatility formula of clomazone". (1) Technical field [0002] The present invention relates to formulations of clomazone with reduced volatility relative to conventional clomazone emulsifiable concentrates. Specifically, it relates to a microcapsule preparation in which clomazone is encapsulated in a polyurea capsule shell. (2) Background technology [0003] Clomazone is the general name of 2-(2-chlorophenyl)methyl-4,4-dimethyl-3-isoxazolinone, which is a highly effective herbicide and also has high volatility, so that the application Clomazone localized to a targeted soil area will migrate to adjacent areas causing discoloration, most typically bleaching or some degree of bleaching of various crops, trees or ornamental plants. Although the bleaching effect indicative of the herbicide's mode of action is temporary when plant...

Claims

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Application Information

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IPC IPC(8): A01N25/28A01N43/80
CPCA01N43/80A01N25/28A01N2300/00
Inventor F·-T·H·李P·尼科尔森
Owner FMC CORP
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