Liquid herbicidal composition having extended penetrating and systemic activity

• US 4,971,630 A
• Filed: 07/17/1986
• Issued: 11/20/1990
• Est. Priority Date: 07/15/1983
• Status: Expired due to Term

• Current Assignee: Pbi/Gordon Corporation
• Original Assignee: Pbi/Gordon Corporation
• Inventors: Skaptason, Johann S.
• Primary Examiner(s): Hollrah, Glennon H.
• Assistant Examiner(s): Covington, Raymond
• Application Number:
  US06/885,388
• Time in Patent Office: 1,587 Days
• Field of Search: 71/117, 71/DIG. 1
• US Class Current: 504/145
• 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 25/02 containing liquids as carriers, diluents or solvents
• CPC Class Codes: A01N 33/04 Nitrogen directly attached to aliphatic or cycloaliphatic carbon atoms
• CPC Class Codes: A01N 33/08 containing oxygen or sulfur
• CPC Class Codes: A01N 39/02 Aryloxy-carboxylic acids; Derivatives thereof
• CPC Class Codes: A01N 39/04 Aryloxy-acetic acids; Derivatives thereof

Abstract

A liquid herbicidal composition is disclosed which retains its penetrating and systemic activity after application to susceptible flora under normal ambient conditions for a period of at least six hours by combining at least two different salts of at least one herbicidally active compound and a polyhydric alcohol having 2 to 6 carbon atoms. The salts are preferably amine, ammonium or alkali metal salts of herbicidally active acid halogenated phenoxy acids. The herbicidal composition upon application to noxious vegetation has the unexpected property of retaining its phytotoxic activity throughout the maximum residence time necessary for effective weed and brush control by virtue of the fact that the composition resists crystallization and displays no tendency to either burn or otherwise damage the external cellular layers of the plant being treated.

Claims

1. An aqueous liquid herbicidal composition especially adapted for ultralow volume aircraft application while retaining the properties of extended penetrating and systemic activity consisting essentially of:

a mixture consisting essentially of at least two different salts of at least one herbicidally active compound, said salts having a stable pH of no less than about 6, present in amounts providing from 10 to 90 parts by weight of one of said salts and from 10 to 90 parts by weight of a second different salt, and each being selected from the group consisting of methylamine, ethylamine, isopropylamine, monomethanolamine, monoethanolamine, monoisopropanolamine, dimethylamine, diethylamine, diisopropanolamine, dimethanolamine, diethanolamine, diisopropanolamine, trimethylamine, triethylamine, triisopropylamine, trimethanolamine, triethanolamine, triisopropanolamine, ammonium sodium, potassium, and lithium salts of herbicidally active acidic compounds selected from the group consisting of 2,4-dichlorophenoxyacetic acid, 2,4-dichlorophenoxypropionic acid, 2,4-dichlorophenoxybutyric acid, 2-methyl-4-chlorophenoxyacetic acid, 2-methyl-4-chlorophenoxypropionic acid, 2-methyl-4-chlorophenoxybutyric acid, 2,4,5-trichlorophenoxyacetic acid;

a sufficient quantity of water to cause said mixture to be in liquid form; and

a sufficient quantity of a polyhydric alcohol selected from the group consisting of polyhydric diols having from 2 to 6 carbon atoms and glycerine which is capable of causing the liquid herbicidal composition to remain noncrystalline as a viscous liquid concentrate and exhibit a pH of no less than about 6 under normal ambient conditions following application to susceptible flora for a period of at least six-hours.

2. A liquid herbicidal composition as set forth in claim 1, wherein said polyhydric alcohol is selected from the group consisting of ethylene glycol, propylene glycol, isopropylene glycol, glycerine, 2,3-hexane diol 2-methyl-2,4-pentane diol, 1,2-pentane diol, 1,6-hexane diol and 2-methyl-1,2 butane diol.

3. A liquid herbicidal composition as set forth in claim 1, wherein said herbicidally active compound is 2,4-dichlorophenoxyacetic acid.

4. A liquid herbicidal composition as set forth in claim 3, wherein one of said salts is the dimethylamine salt of 2,4-dichlorophenoxyacetic acid.

5. A liquid herbicidal composition as set forth in claim 4, wherein one of said salts is the diethanolamine salt of 2,4-dichlorophenoxyacetic acid.

6. A liquid herbicidal composition as set forth in claim 1, wherein said chelating agent is citric acid.

9. A liquid herbicidal composition as set forth in anyone of claims 3, 4 or 5 wherein said polyhydric alcohol is ethylene glycol.

7. A liquid herbicidal composition having extended penetrating and systemic activity comprising the mixture of on a parts by weight basis of 3.9 parts of 2,4-dichlorophenoxyacetic acid, 1.7 parts of dimethylamine (40%), 0.5 part of diethanolamine (98%), 0.2 part of citric acid, 0.2 part of a substituted phenyl propane ligno-sulfonate, 1 part of ethylene glycol, and 2.6 parts of water.

8. A method of controlling noxious vegetation comprising the steps of:

applying to said vegetation by aircraft an effective amount of a liquid herbicidal composition, said composition consisting essentially of a mixture of at least two different salts of at least one herbicidally active compound, said salts having a stable pH of no less than about 6, present in amounts providing from 10 to 90 parts by weight of one of said salts and from 10 to 90 parts by weight of a second different salt, and each being selected from the group consisting of methylamine, ethylamine, isopropylamine, monomethanolamine, monoethanolamine, monoisopropanolamine, dimethylamine, diethylamine, diisopropanolamine, dimethanolamine, diethanolamine, diisopropanolamine, trimethylamine, triethylamine, triispropylamine, trimethanolamine, triethanolamine, triisopropanolamine, ammonium sodium, potassium, and lithium salts of herbicidally active acidic compounds selected from the group consisting of 2,4-dichlorophenoxyacetic acid, 2,4-dichlorophenoxypropionic acid, 2,4-dichlorophenoxybutyric acid, 2-methyl-4-chlorophenoxyacetic acid, 2-methyl-4-chlorophenoxybutyric acid, 2,4,5-trichlorophenoxyacetic acid;

a sufficient quantity of water to cause said mixture to be in liquid form; and

a sufficient quantity of a polyhydric alcohol selected from the group consisting of polyhydric diols having from 2 to 6 carbon atoms and glycerine which is capable of causing the liquid herbicidal composition to remain noncrystalline as a viscous liquid concentrate and exhibit a pH of no less than about 6 under normal ambient conditions following application to susceptible flora for a period of at least six hours.