Low-foam aqueous formulations for crop protection
Liquid aqueous formulations of water-soluble active crop protectant ingredients which comprise (a) one or more water-soluble active ingredients (type (a) ingredients), (b) if desired, one or more water-insoluble active ingredients (type (b) ingredients), (c) if desired, polar organic solvents, (d) anionic surfactants, (e) if desired, nonionic, cationic and/or zwitterioinic surfactants, (f) silicone-based defoamers from the group of the linear polydimethylsiloxanes having an average dynamic viscosity, measured at 25° C., in the range from 1000 to 8000 mPas, and containing silica, (g) if desired, other, customary formulation assistants, and (h) water are suitable as low-foam formulations for application in crop protection. Also possible is the use of the corresponding active-ingredient-free adjuvant formulations in a tank mix with or in split application with active-ingredient formulations.
1. A liquid aqueous herbicidal composition consisting of:
(a) 1% to 40% by weight of one or more water-soluble herbicidal active ingredients selected from the group consisting of compounds of the formula (1) or salts thereof:
in which Z 1 is a radical of the formula:
—OM;
—NHCH(CH 3 )CONHCH(CH 3 )CO 2 M; or
—NHCH(CH 3 )CONHCH[CH 2 CH(CH 3 ) 2 ]CO 2 M;
where:
M=H or a salt-forming cation;
(c) 0% to 50% by weight of polar organic solvents;
(d) 1% to 80% by weight of anionic surfactants;
(e) 0 to 20% by weight of nonionic, cationic, and/or zwitterionic surfactants;
(f) 0.02% to 10% by weight of silicone-based defoamers selected from the group of the linear polydimethylsiloxanes having an average dynamic viscosity, measured at 25° C., in the range from 1000 to 8000 mPas, and containing silica;
(g) 0 to 30% by weight of other customary formulation assistants; and
(h) 0.1% to 90% by weight of water.
2. The herbicidal composition as claimed in claim 1 ;
wherein component (c) is present in an amount of 0% to 40% by weight;
wherein component (d) is present in an amount of 3% to 80% by weight;
wherein component (f) contains 0.1 to 10% by weight of silica based on the weight of polydimethylsiloxane.
3. The herbicidal composition as claimed in claim 1 ;
wherein component (a) 2% to 30% is present in an amount of by weight;
wherein component (c) 0% to 30% is present in an amount of by weight;
wherein component (d) 5% to 70% is present in an amount of by weight;
wherein component (e) 0 to 15% is present in an amount of by weight;
wherein component (f) is present in an amount of 0.05% to 5% by weight, and contains 0.1 to 10% by weight of silica based on the weight of polydimethylsiloxane;
wherein component (g) is present in an amount of 0 to 20% by weight; and
wherein component (h) is present in an amount of 5% to 85% by weight.
4. The herbicidal composition as claimed in claim 1 ;
wherein component (a) is present in an amount of 5% to 20% by weight;
wherein component (c) is present in an amount of 0% to 20% by weight;
wherein component (d) is present in an amount of 6% to 60% by weight;
wherein component (e) is present in an amount of 0 to 15% by weight;
wherein component (f) is present in an amount of 0.1% to 2% by weight, and contains 0.1 to 10% by weight of silica based on the weight of polydimethylsiloxane;
wherein component (g) is present in an amount of 0 to 15% by weight; and
wherein component (h) is present in an amount of 10% to 60% by weight.
5. The herbicidal composition as claimed in claim 1 ;
wherein the weight ratio of the water-soluble herbicidal active ingredients to the anionic surfactants, is in the range from 1:0.1 to 1:10.
6. The herbicidal composition as claimed in claim 2 ;
wherein the weight ratio of the water-soluble herbicidal active ingredients to the anionic surfactants, is in the range from 1:0.1 to 1:10.
7. The herbicidal composition as claimed in claim 2 ;
wherein the weight ratio of the water-soluble herbicidal active ingredients to the polydimethylsiloxane silica-containing defoamer is in the range from 1000:1 to 1:1.
8. The herbicidal composition as claimed in claim 3 ;
wherein the weight ratio of the water-soluble herbicidal active ingredients to the anionic surfactants, is in the range from 1:0.1 to 1:10.
9. The herbicidal composition as claimed in claim 4 ;
wherein the weight ratio of the water-soluble herbicidal active ingredients to the anionic surfactants, is in the range from 1:0.1 to 1:10.
10. The herbicidal composition as claimed in claim 1 ;
wherein the weight ratio of the anionic surfactants to the polydimethylsiloxane silica-containing defoamer is in the range from 2000:1 to 1:1.
11. The herbicidal composition as claimed in claim 2 ;
wherein the weight ratio of the anionic surfactants to the polydimethylsiloxane silica-containing defoamer is in the range from 2000:1 to 1:1.
12. The herbicidal composition as claimed in claim 3 ;
wherein the weight ratio of the anionic surfactants to the polydimethylsiloxane silica-containing defoamer is in the range from 2000:1 to 1:1.
13. The herbicidal composition as claimed in claim 5 ;
wherein the weight ratio of the anionic surfactants to the polydimethylsiloxane silica-containing defoamer is in the range from 2000:1 to 1:1.
14. The herbicidal composition as claimed in claim 1 ;
wherein the water-soluble herbicidal active ingredient is the herbicide glufosinate-ammonium.
15. The herbicidal composition as claimed in claim 13 ;
wherein the water-soluble herbicidal active ingredient is the herbicide glufosinate-ammonium.
16. A process for preparing the herbicidal composition as defined in claim 1 , comprising:
mixing components (a) and (c) to (g) present in the formulation with water (component (h)).
17. A method of controlling unwanted plant growth, comprising:
applying an effective amount of the herbicidal composition as claimed in claim 1 to the plants, to parts of plants, or to the area under cultivation.