Microparticle compositions comprising saflufenacil

Patent metadata

Field	Value
Publication number	US-11317628-B2
Application number	US-201615756353-A
Country	US
Kind code	B2
Filing date	Sep 2, 2016
Priority date	Sep 3, 2015
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

The present invention relates to microparticle compositions comprising saflufenacil, to a method of their preparation and to the use of these microparticle compositions for controlling undesired vegetation. In the microparticle compositions saflufenacil is present in the form of microparticles, which comprise solid saflufenacil, which is surrounded or embedded by an aminoplast polymer.

First claim

We claim:

1. A microparticle composition comprising saflufenacil, wherein saflufenacil is present in the form of microparticles, which comprise solid saflufenacil, which is surrounded or embedded by an aminoplast polymer, which is a polycondensation product of one or more amino compounds and one or more aldehydes, wherein the aminoplast polymer is selected from the group consisting of melamine formaldehyde resins and urea formaldehyde resins, and wherein the amount of aminoplast polymer in the microparticle composition is from 0.5 to 40% by weight, based on the total weight of aminoplast polymer and saflufenacil,
and wherein the microparticle composition comprises at least one anionic polymeric surfactant A having a plurality of sulfate or sulfonate groups selected from the group consisting of
a lignin based sulfonic acid;
an arylsulfonic acid formaldehyde condensate and an arylsulfonic acid formaldehyde urea condensate; and
a homo- or copolymer of monomer M1 selected from a (meth)acrylate monomer having a sulfonic acid group and a (meth)acrylamide monomer having a sulfonic acid group, optionally with one or more comonomer M2 different from monomer M1.

2. The composition of claim 1 , wherein the microparticles have a weight average particle diameter d 50 in the range from 1 to 25 μm, as determined by dynamic light scattering of an aqueous dispersion of the microcapsules.

3. The composition of claim 1 , wherein the microparticles comprise less than 10% by weight of particles having a particle diameter of more than 50 μm, as determined by dynamic light scattering of an aqueous dispersion of the microcapsules.

4. The composition of claim 1 , wherein the polymeric surfactant A is a homo- or copolymer of a monomer M1 which is a (meth)acrylate monomer having a sulfonic acid group or a (meth)acrylamide monomer having a sulfonic acid group optionally with one or more comonomer M2.

5. The composition of claim 4 , wherein the monomer M1 is 2-acrylamido-2-methylpropane sulfonic acid.

6. The composition of claim 4 , wherein the composition contains a further polymeric surfactant A selected from lignin based sulfonic acids.

7. The composition of claim 6 , wherein the lignin based sulfonic acid is selected from the group consisting of a lignosulfonic acid and ethoxylated lignosulfonic acid.

8. The composition of claim 1 , further comprising at least one anionic emulsifier in addition to the polymeric surfactant A.

9. The composition of claim 1 , which is an aqueous suspension of the microparticles.

10. The composition of claim 1 , which is solid composition of the microparticles.

11. The composition of claim 1 , comprising one or more auxiliaries conventionally employed for the formulation of plant protection compositions.

12. A method for producing the composition of claim 1 , which comprises the following steps:
i) providing an aqueous suspension or dispersion of solid saflufenacil particles;
ii) adding an aminoplast pre-condensate to the aqueous suspension; and
iii) effecting the polycondensation of the aminoplast pre-condensate in the presence of at least one anionic polymeric surfactant A having a plurality of sulfate or sulfonate groups,
wherein the aminoplast polymer is selected from the group consisting of melamine formaldehyde resins and urea formaldehyde resins, and wherein the amount of aminoplast polymer in the microparticle composition is from 0.5 to 40% by weight, based on the total weight of aminoplast polymer and saflufenacil,
and wherein the at least one anionic polymeric surfactant A is selected from the group consisting of:
a lignin based sulfonic acid;
an arylsulfonic acid formaldehyde condensate and an arylsulfonic acid formaldehyde urea condensate; and
a homo- or copolymers of monomer M1 selected from a (meth)acrylate monomer having a sulfonic acid group and a (meth)acrylamide monomer having a sulfonic acid group, optionally with one or more comonomer M2 different from monomer M1.

13. The method of claim 12 , wherein the saflufenacil particles in the aqueous suspension dispersion have a weight average particle diameter d 50 in the range from 0.5 to 25 μm, as determined by dynamic light scattering.

14. The method of claim 12 , wherein the amount of aminoplast pre-condensate added in step ii) is in the range 0.5 to 40% by weight, based on the total amount of saflufenacil and aminoplast pre-condensate and calculated as solid organic matter.

15. The method of claim 12 , wherein the at least one anionic polymeric surfactant A having a plurality of sulfate or sulfonate groups is a homo- or copolymer of a monomer M1 which is a (meth)acrylate monomer having a sulfonic acid group or (meth)acrylamide monomer having a sulfonic acid group, optionally with one or more comonomer M2.

16. The method of claim 15 , wherein the monomer M1 is 2-acrylamido-2-methylpropane sulfonic acid.

17. The method of claim 15 , wherein an additional polymeric surfactant A is used, which is a lignin based sulfonic acid.

18. The method of claim 17 , wherein the lignin based sulfonic acid is selected from the group consisting of a lignosulfonic acid and ethoxylated lignosulfonic acid.

19. The method of claim 12 , wherein the at least one anionic polymeric surfactant A having a plurality of sulfate or sulfonate groups is added prior to the addition of the aminoplast pre-condensate in step ii).

20. The method of claim 12 , wherein the optional one or more comonomer M2 is selected from the group consisting of styrene, C 1 -C 4 -alkylacrylates, C 1 -C 4 -alkylmethacrylates, acrylamide, methacrylamide, acrylic acid, methacrylic acid, C 1 -C 4 -alkylacrylates, and C 1 -C 4 -alkylmethacrylates.

21. The method of claim 12 , wherein the lignin based sulfonic acid is selected from the group consisting of a lignosulfonic acid and ethoxylated lignosulfonic acid.

22. A method of controlling undesired vegetation, wherein the microparticle composition of claim 1 is allowed to act on plants, their environment and/or on seeds.

23. The composition of claim 1 , wherein the optional one or more comonomer M2 is selected from the group consisting of styrene, C 1 -C 4 -alkylacrylates, C 1 -C 4 -alkylmethacrylates, acrylamide, methacrylamide, acrylic acid, methacrylic acid, C 1 -C 4 -alkylacrylates, and C 1 -C 4 -alkylmethacrylates.

24. The composition of claim 1 , wherein the lignin based sulfonic acid is selected from the group consisting of a lignosulfonic acid and ethoxylated lignosulfonic acid.

Assignees

• Basf Agro Bv

Inventors

• Noller Bastian Marten
• Fuchs Yannick
• Simon Anja
• Sowa Christian

Classifications

• B01J13/18

  In situ polymerisation with all reactants being present in the same phase · CPC title

• A01N43/54 Primary

  1,3-Diazines; Hydrogenated 1,3-diazines · CPC title

• A01G7/06

  Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants · CPC title

• A01N25/28

  Microcapsules {or nanocapsules} · CPC title

• A01C1/06 Primary

  Coating or dressing seed · CPC title