Aqueous dispersions including polymer particles

Patent metadata

Field	Value
Publication number	US-2024298634-A1
Application number	US-202017637022-A
Country	US
Kind code	A1
Filing date	Aug 27, 2020
Priority date	Aug 27, 2019
Publication date	Sep 12, 2024
Grant date	—

Abstract

Suspensions include an aqueous medium and a plurality of particles. The particles include polymeric carrier material dispersed throughout the particle and active ingredient dispersed throughout the particle. The polymeric carrier material can be biodegradable, and one example is a cellulose ester. Exemplary active ingredients include an insecticide, a fungicide, and a pesticide. In some instances, the plurality of particles have an average diameter of 25 nm to 5 μm. Exemplary suspensions may be applied to plant surfaces.

First claim

1 . A method of treating a plant, the method comprising:
applying a suspension to a surface of the plant, the suspension comprising:
an aqueous medium; and
a plurality of particles dispersed throughout the aqueous medium, wherein each particle in the plurality of particles includes polymeric carrier material and active ingredient dispersed throughout the particle.

2 . The method according to claim 1 , wherein the polymeric carrier material degrades at least 90% in two years.

3 . The method according to claim 1 , wherein the polymeric carrier material includes a cellulose ester.

4 . The method according to claim 3 , wherein the cellulose ester has a degree of substitution from 1 to 3.

5 . The method according to claim 3 , wherein the cellulose ester has a degree of substitution from 2.0 to 2.85.

6 . The method according to claim 3 , wherein the polymeric carrier material comprises cellulose acetate, cellulose diacetate, cellulose acetate propionate, cellulose acetate butyrate, or a combination thereof.

7 . The method according to claim 1 , wherein the active ingredient comprises an insecticide, a fungicide, a pesticide, or a combination thereof.

8 . The method according to claim 7 , wherein the active ingredient comprises fluopyram.

9 . The method according to claim 1 , wherein the plurality of particles include, by weight, less than about 20% of polymeric carrier material.

10 . The method according to claim 9 , wherein the plurality of particles include, by weight, 0.1% to 10% of polymeric carrier material

11 . The method according to claim 1 , wherein the plurality of particles have an average diameter of 25 nm to 5 μm.

12 . The method according to claim 11 , wherein the plurality of particles have an average diameter of 100 nm to 1 μm.

13 . The method according to claim 1 , wherein the active ingredient can be released at a continuous rate of 40-68% over a period of 24 hours.

14 . The method according to claim 1 , further comprising no more than 1% by volume organic solvent.

15 . The method according to claim 1 , wherein the plurality of particles adhere at least 40% of an initial amount after being subjected to 5 min of continuous water flow.

16 . The method according to claim 1 , wherein the plurality of particles further comprise 0.005 wt % to 2 wt % surfactant.

17 . A method of making a suspension, the method comprising:
adding polymer material to an organic solvent such that the polymer material is present in the organic solvent at a concentration less than 20 wt. %; adding an active ingredient to the organic solvent, the active ingredient being one of: an insecticide, a fungicide, and a pesticide; agitating the organic solvent with the polymer material and the active ingredient, thereby generating an organic solvent mixture; adding aqueous media to the organic solvent mixture, thereby generating particles including:
the polymer material dispersed throughout each particle; and
the active ingredient dispersed throughout each particle; and
removing the organic solvent, thereby generating an aqueous suspension comprising no more than 5% by volume organic solvent.

18 . The method according to claim 17 , the aqueous suspension comprising no more than 1% by volume organic solvent.

19 . The method according to claim 16 , the polymer material being a cellulose ester.

20 . The method according to claim 19 , the plurality of particles including, by weight, less than 20% of polymer material.

21 . The method according to claim 20 , the polymer material being cellulose acetate with a degree of substitution of 1 to 3; and
the active ingredient being fluopyram.

22 . The method according to claim 16 , wherein the aqueous media is added to the organic solvent mixture in doses, each dose volume being no more than 1 wt % of an organic solvent mixture volume.

Assignees

• Univ North Carolina State

Inventors

• Tripathi Anurodh
• Pirzada Tahira
• Vasconcelos De Farias Barbara
• Khan Saad A
• Mathew Reny
• Opperman Charles H

Classifications

• A01N43/40 Primary

  six-membered rings · CPC title

• A01N25/04

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

• A01P3/00

  Fungicides · CPC title

• A01P7/04

  Insecticides · CPC title

• A01P5/00

  Nematocides · CPC title