Herbidical aqueous based microemulsion compositions

• US 4,995,900 A
• Filed: 11/30/1988
• Issued: 02/26/1991
• Est. Priority Date: 11/30/1988
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: American Colloid Company (Minerals Technologies Incorporated)
• Inventors: Futcher, Ian
• Primary Examiner(s): Raymond, Richard L.
• Assistant Examiner(s): Burn, Brian Mo
• Application Number:
  US07/278,302
• Time in Patent Office: 818 Days
• Field of Search: 71/92, 71/DIG. 1
• US Class Current: 504/139
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/04 Dispersions, emulsions, suspoemulsions, suspension concentrates or gels foams A01N25/16
• CPC Class Codes: A01N 37/40 having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system
• CPC Class Codes: A01N 39/02 Aryloxy-carboxylic acids; Derivatives thereof
• CPC Class Codes: A01N 39/04 Aryloxy-acetic acids; Derivatives thereof
• CPC Class Codes: A01N 43/56 1,2-Diazoles; Hydrogenated 1,2-diazoles

Abstract

Herbicidal aqueous microemulsions of difenzoquat methyl sulfate, an essentially water insoluble active ingredient, and a nonionic surfactant demonstrate increased stability.

Claims

1. A herbicidal aqueous-based microemulsion comprising on a weight to volume basis about 20% to 40% of a 1,2-dimethyl-3,5-diphenylpyrazolium salt;

about 5% to 25% of at least one essentially water insoluble herbicidally active ingredient selected from the group consisting of esters of 2,4-D acid;

about 5% to 40% of at least one nonionic surfactant; and

0% to about 25% of adjuvants.

2. The microemulsion according to claim 1, wherein one surfactant is used.

3. The microemulsion according to claim 2, wherein the 1,2-dimethyl-3,5-diphenylpyrazolium salt is 1,2-dimethyl-3,5-diphenylpyrazolium methyl sulfate.

4. The microemulsion according to claim 1, wherein the 1,2-dimethyl-3,5-diphenylpyrazolium salt is 1,2-dimethyl-3,5-diphenylpyrazolium methyl sulfate.

5. The microemulsion according to claim 4, wherein the surfactant is selected from the group consisting of polyethoxylated alkylphenols with about 6 to 15 moles of ethylene oxide and mixtures thereof.

6. The microemulsion according to claim 5, wherein the surfactant is polyethoxylated octyl or nonyl phenols with 8-10 moles of ethylene oxide or mixtures thereof and the water insoluble active ingredient is selected from the group consisting of straight or branched C₄ -C₁₀ alkyl esters of 2,4-D and mixtures thereof.

7. The microemulsion according to claim 6, comprising on a weight to volume basis about 24% to 25% 1,2-dimethyl-3,5-diphenylpyrazolium methyl sulfate;

about 14% to 16% isoctyl ester 2,4-D, about 30% polyethyoxylated octyl phenyl with 9-10 moles of ethylene oxide, about 18% isobutyl alcohol about 2% urea and about 0.01% antifoaming agents.