Granular controlled release agrochemical compositions and process for the preparation thereof

a technology of agrochemical compositions and controlled release, applied in the field of granular agrochemical compositions, can solve the problems of increased risk of leaching to ground water or surface water, inefficiency and unwoundness, and inability to meet the needs of agricultural production, and achieve the effect of high efficiency

Inactive Publication Date: 2007-03-29
EVERRIS INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025] The present invention involves the development of a new system for release of active ingredients, such as herbicides, growth re...

Problems solved by technology

Too much active ingredient, however, is inefficient and not desired because of environmental and economic concerns.
Furthermore, higher amounts of active ingredient lead to increased risks of leaching to ground water or surface water.
Higher amounts can also lead to phytotoxicity for the crop.
Insufficient levels of active ingredients results in lack of control of the pest and increase the risk of resistance.
However, multiple applications of active ingredients becomes labor and cost intensive.
With conventional applications of liquid or powder formulations, relatively high amounts of active ingredients are applied several times to assure control of pests over a longer period of time, typically 3-6 times for seasonal control, and users are exposed to the active ingredients during each application, which is undesirable.
When active ingredients are applied in granular form instead of by spraying or dusting, the risk of exposure to the active ingredient is more limited.
Thus high concentrations result in relatively more degradation and leaching.
In general, known controlled release granular active ingredients suffer serious limitations.
They generally do not deliver the active ingredient to the biological system for periods of greater than about 30 days from the date of initial exposure to moisture and/or they do not completely release the active ingredient.
The practical limitations of systems that release the active ingredient in less than about 30 days are that they must be periodically reapplied during the growing season resulting in additional cost.
The limitations of systems which do not completely release the active ingredient in the desired period of time are related to efficiency.
This incurs additional cost to the user.
Furthermore, the residual, unreleased active ingredient poses an environmental threat and can lead to biological resistance i...

Method used

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  • Granular controlled release agrochemical compositions and process for the preparation thereof
  • Granular controlled release agrochemical compositions and process for the preparation thereof
  • Granular controlled release agrochemical compositions and process for the preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] A sample of the granular agrochemical compositions of the present invention was prepared employing an 0-2-40 fertilizer granule obtained from The Scotts Company (Howden, UK) as the granular core material. This granular core was predominantly composed of potassium sulfate. The sample composition was prepared by initially heating 50 g of the 0-2-40 fertilizer granules (1.7-2.0 mm) in a rotating drum to 110° C. Then, 0.75 g of a non-ionic surfactant wax (a polyethyleneglycol-block-polyethylene, cas nr.: [251553-55-6], hydroxyl number 52.00 mg KOH / g, containing 20% (by weight) polyethylene glycol, obtained from Sigma-Aldrich), was melted and 0.25 g of a biologically active ingredient (imidacloprid, obtained from Sigma-Aldrich) was mixed into in the molten wax.

[0065] Then, the resulting mixture of imidacloprid and wax was added to the warm fertilizer (potassium sulfate) granules to form a coating layer on the granular core. The granules with the imidacloprid and wax coating there...

example 2

[0069] The composition produced in accordance with this Example 2 is distinguishable from the compositions produced in accordance with Example 1 in regard to the wax material employed in forming the first coating layer of test sample of the granular agrochemical composition of the present invention. The procedure used to produce the test sample of this Example 2 was in accordance with the process of Example 1.

[0070] Specifically, an 0-2-40 fertilizer granule obtained from The Scotts Company which was predominantly composed of potassium sulfate was employed as the granular core material for the sample composition which was prepared by initially heating 50 g of the 0-2-40 fertilizer granules (1.7-2.0 mm) in a rotating drum to 110° C. Then, 0.75 g of a polyethyleneglycol-block-polyethylene, cas nr.: [97953-22-5], hydroxyl number 55.00 mg KOH / g, containing 50% (by weight) polyethylene glycol, obtained from Sigma-Aldrich) was melted and 0.25 g of a biologically active ingredient (imidac...

example 3

[0073] The composition produced in accordance with this Example 3 is distinguishable from the compositions produced in accordance with Example 2 in regard to the amount of the active ingredient which was incorporated into the wax material in forming the first coating layer of test sample of the granular agrochemical composition of the present invention.

[0074] The procedure used to produce the test sample of this Example 3 was in accordance with the process of Example 1. Specifically, an 0-2-40 fertilizer granule obtained from The Scotts Company which was predominantly composed of potassium sulfate was employed as the granular core material for the sample composition which was prepared by initially heating 50 g of the 0-2-40 fertilizer granules (1.7-2.0 mm) in a rotating drum to 110° C. Then, 0.75 g of a polyethyleneglycol-block-polyethylene, cas nr.: [97953-22-5], hydroxyl number 55.00 mg KOH / g, containing 50% polyethyleneglycol, obtained from Sigma-Aldrich) was melted and 0.75 g o...

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PUM

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Abstract

A granular agrochemical composition is disclosed including a granular core material having a water soluble portion with a first coating layer applied on the surface of the core material and a second coating layer applied on the surface of the first coating layer. The first coating layer includes a wax composition having a biologically active ingredient incorporated therein and the second coating layer includes a polymeric composition. The granular agrochemical composition exhibits a controlled rate of release of the biologically active ingredient therefrom over a period greater than about 30 days from the date of initial exposure of the granular composition to moisture whereby essentially all of the biologically active ingredient incorporated in the wax material of the first coating layer is released from the granular composition before the water soluble portion of the granular core material is released from the granular composition.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to granular agrochemical compositions and to processes for producing such compositions. More particularly, it relates to controlled release agrochemical compositions having a first coating layer comprising a wax composition with a biologically active ingredient incorporated therein applied on the surface of a core material and having a second coating layer comprising a polymeric composition applied on the surface of the first coating layer and to processes for preparing such compositions. [0003] 2. Description of Related Art [0004] Agrochemicals as referred to herein include biologically active ingredients / plant protection products such as insecticides, herbicides, fertilizers, growth regulators, pheromones, biostimulants, acaricides, miticides, nematocides, fungicides and the like. Such agrochemicals are well known and are in common usage for controlling pests and diseases and for prom...

Claims

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Application Information

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IPC IPC(8): A01N25/12A01N25/00C05G3/60
CPCA01N25/12A01N25/14C05G3/0029C05G3/02A01N51/00A01N57/12C05G3/0035C05B1/02C05G3/60C05B7/00C05B17/00C05C1/00C05C3/00C05C5/02C05C9/00C05D1/00C05D1/02C05D3/00C05D5/00C05G3/00C05G5/37C05G5/38
Inventor VAN BOXTEL-VERHOEVEN, LONNEKE JACOBATERLINGEN, JOHANNES GIJSBERTUS ANTONIUSLUNDE-VANNUYS, PETRA LEONARDA HENDRICA
Owner EVERRIS INT
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