Concentrated Suspension of Agrochemicals in High Electrolyte Aqueous Medium

Patent metadata

Field	Value
Publication number	US-2016330966-A1
Application number	US-201415107725-A
Country	US
Kind code	A1
Filing date	Dec 29, 2014
Priority date	Dec 31, 2013
Publication date	Nov 17, 2016
Grant date	—

Abstract

The present invention generally relates to stable suspension concentrates (SC) displaying shear thinning property and comprising: a water soluble salt, an electrolyte water thickening polymer (eg. xanthan gum or guar gum), an insoluble solid agrochemical and water. The water soluble salt can be an inorganic salt or a pesticide salt (eg. fertilizer or water soluble herbicide such as glyphosate, glufosinate, dicamba, MCPA or 2,4-D); the water thickening polymer is a water soluble polymer capable of fully hydrating and thickening the salt solution (eg. AGHRO DR-2000); and the insoluble solid agrochemical can be a cellulosic derivative MEHEC, a water insoluble pesticide (eg. atrazine, clothianidin or imidacloprid), a water insoluble growth regulator, a water insoluble micronutrient or mixtures thereof. The invention further relates to a method of producing said suspension comprising dissolving thickening polymer in water, adding water soluble salt and adding water insoluble agrochemical.

First claim

1 . An aqueous suspension composition comprising i) at least one water soluble salt having at least 20% solubility at 25° C. in water, ii) at least one electrolyte water thickening polymer capable of thickening the composition selected from the group consisting of xanthan gum, xantham gum derivatives, guar gum, guar gum derivative, or a mixture thereof, iii) at least one solid agrochemical selected from the group consisting of methylethyl hydroxylethyl cellulose, a water insoluble pesticide having less than 2 wt % solubility at 25° C. in water, a water insoluble growth regulator having less than 2 wt % solubility at 25° C. in water, a water insoluble micronutrient having less than 2 wt % solubility at 25° C. in water, and combinations and mixtures thereof, and the remainder water, wherein the composition displays shear thinning property and has a viscosity of less than 30000 cps at 25° C. as measured by a Brookfield viscometer DV-II Pro with a spindle #64 at 60 RPM, and wherein the concentration of the water soluble salt is from 15 to 70 wt %, the concentration of the electrolyte water thickening polymer is from 0.1 to 2 wt %, the concentration of the solid agrochemical is from 3 to 50 wt %, balanced with water to 100 wt %.

2 . The composition of claim 1 wherein the water soluble salt is a fertilizer.

3 . The composition of claims 1 wherein the solid agrochemical is an herbicide.

4 . The composition of claim 3 wherein the solid agrochemical is atrazine.

5 . The composition of claim 1 wherein the solid agrochemical is an insecticide.

6 . The composition of claim 5 wherein the solid agrochemical is clothianidin.

7 . The composition of claim 5 wherein the solid agrochemical is imidacloprid.

8 . The composition of claim 2 wherein the water soluble pesticide salt is glyphosate salt, dicamba salt, 2,4-D salt, MCPA salt, glufosinate salt, or mixtures or combinations thereof.

9 . The composition of claim 2 wherein the water soluble salt is further combined with a water soluble pesticide salt.

10 . A method of preparing an aqueous liquid suspension composition comprising mixing at least one electrolyte water thickening polymer in water selected from the group consisting of xanthan gum, xanthan gum derivatives, guar gum, guar gum derivative, or a mixture thereof in a vessel until the electrolyte water thickening polymer is fully hydrated or until the viscosity has been developed in order to obtain a premix, mixing at least one water soluble salt having at least 20% solubility at 25° C. in water with the premix, and further followed by mixing at least one solid agrochemical selected from the group consisting of methylethyl hydroxylethyl cellulose, a water insoluble pesticide having less than 2 wt % solubility at 25° C. in water, a water insoluble growth regulator having less than 2 wt % solubility at 25° C. in water, a water insoluble micronutrient having less than 2 wt % solubility at 25° C. in water, and combinations and mixtures thereof into said premix until a homogeneous suspension composition is obtained; wherein the suspension composition displays shear thinning property with a viscosity less than 30000 cps, as measured at about 25° C. with a Brookfield viscometer DV-II Pro with a spindle #64 at 60 RPM, and wherein the concentration of the water soluble salt is from 15 to 70 wt %, the concentration of the electrolyte water thickening polymer is from 0.1 to 2 wt %, the concentration of the solid agrochemical is from 3 to 50 wt %, balanced with water to 100 wt %.

11 . The method of claim 10 wherein the water soluble salt is further combined with a water soluble pesticide salt.

12 . The method of claim 11 wherein the soluble pesticide salt selected from the group consisting of a glyphosate salt, dicamba salt, 2,4-D salt, or glufosinate salt, and combinations and mixtures thereof.

13 . The method of claim 10 wherein the electrolyte water thickening polymer is non-derived or derived guar gum.

14 . An aqueous suspension composition created from claim 10 wherein the electrolyte water thickening polymer is xanthan gum or xanthan gum derivative.

15 . An aqueous suspension composition comprising i) at least one water soluble salt having at least 20% solubility at 25° C. in water, ii) at least one electrolyte water thickening polymer selected from the group consisting of xanthan gum, xanthan gum derivatives, guar gum, guar gum derivative, or a mixture thereof, iii) at least one solid agrochemical selected from the group consisting of methylethyl hydroxylethyl cellulose, a water insoluble pesticide, a water insoluble growth regulator, a water insoluble micronutrient, and combinations and mixtures thereof, and the remainder water, wherein the composition displays shear thinning property and has a viscosity of less than 30000 cps at 25° C. as measured by a Brookfield viscometer DV-II Pro with a spindle #64 at 60 RPM.

16 . A method of preparing an aqueous liquid suspension composition comprising the steps:
(i) first adding and dissolving at least one water soluble inorganic salt having at least 20% solubility at 25° C. in water in a vessel, (ii) next adding and mixing at least one electrolyte water thickening polymer selected from guar gum and its derivatives in the vessel until the electrolyte water thickening polymer is fully hydrated or until the viscosity has been developed, (iii) next mixing at least one solid agrochemical selected from the group consisting of methylethyl hydroxylethyl cellulose, a water insoluble pesticide, a water insoluble growth regulator, a water insoluble micronutrient, and combinations and mixtures thereof into the vessel until a homogeneous suspension composition is obtained; wherein the suspension composition displays shear thinning property with a viscosity less than 30000 cps, as measured at about 25° C. with a Brookfield viscometer DV-II Pro with a spindle #64 at 60 RPM and wherein the concentration of the water soluble salt is from 15 to 70 wt %, the concentration of the electrolyte water thickening polymer is from 0.1 to 2 wt %, the concentration of the solid agrochemical is from 3 to 50 wt %, balanced with water to 100 wt %.

17 . The method of claim 16 wherein the water soluble salt is further combined with a water soluble pesticide salt.

18 . The method of claim 17 wherein the soluble pesticide salt is selected from the group consisting of a glyphosate salt, dicamba salt, 2,4-D salt, or glufosinate salt, and combinations and mixtures thereof.

Assignees

• Akzo Nobel Chemicals Int Bv

Inventors

• Zhu Shawn

Classifications

• C05G5/27

  Dispersions, e.g. suspensions or emulsions · CPC title

• C05G3/60

  Biocides or preservatives, e.g. disinfectants, pesticides or herbicides; Pest repellants or attractants · CPC title

• C05G3/80

  Soil conditioners · CPC title

• C05C3/00

  Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor · CPC title

• A01N25/04 Primary

  Dispersions, {emulsions, suspoemulsions, suspension concentrates} or gels (foams A01N25/16) · CPC title