Herbicides based on pyridazones
AssigneeBASF SE
InventorsDieter Kleuser, August Wigger
Life of this patent
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Abstract
Herbicides based on an aqueous suspension of from 20 to 50 percent by weight of 1-phenyl-4-amino-5-chloro-pyridaz-6-one or 1-phenyl-4-amino-5-bromo-pyridaz-6-one, from 2 to 10 percent by weight of dispersant, from 0.5 to 5 percent by weight of silica and from 0.5 to 5 percent by weight of a block polymer of propylene glycol, propylene oxide and ethylene oxide, which additionally contain a thiolcarbamate, a chloroacetanilide or a 2,6-dinitroaniline, the weight ratio of pyridazone to thiolcarbamate, chloroacetanilide or 2,6-dinitroaniline being from 4:1 to 1:2, a process for their preparation, and their use for combating undesired plant growth.
Claims5
A herbicide comprising a stable aqueous suspension containing from 20 to 50 percent by weight of 1-phenyl-4-amino-5-chloro-pyridaz-6-one or 1-phenyl-4-amino-5-bromo-pyridaz-6-one, from 2 to 10 percent by weight of dispersant, from 0.5 to 5 percent by weight of silica and from 0.5 to 5 percent by weight of a block polymer of propylene glycol, propylene oxide and ethylene oxide, which additionally contains a thiolcarbamate of the formula I ##STR4## where R.sup.1 is alkyl of up to 4 carbon atoms,
- R.sup.2 is alkyl of up to 4 carbon atoms or cyclohexyl and
- R.sup.3 is alkyl of up to 4 carbon atoms, 2,3-dichloroallyl or 2,3,3-trichloroallyl,
- or a chloroacetanilide of the formula II ##STR5## where R.sup.1 and R.sup.2 are methyl or ethyl and
- R.sup.3 is alkyl of up to 3 carbon atoms or alkoxyalkyl of up to 4 carbon atoms,
- or a 2,6-dinitroaniline of the formula III ##STR6## where R.sup.1 is hydrogen or alkyl of up to 5 carbon atoms,
- R.sup.2 is alkyl of up to 5 carbon atoms and
- R.sup.3 and R.sup.4 are unsubstituted or halogen-substituted alkyl of up to 2 carbon atoms,
- the weight ratio of pyridazone to thiolcarbamate, chloroacetanilide or dinitroaniline being from 4:1 to 1:2.
Dependencies are inferred from the claim text.