Method of preparing glyphosate herbicide formulations

Details Method of preparing glyphosate herbicide formulations Method of preparing glyphosate herbicide formulations

1999-03-08

2002-10-22

Pak, John (Department: 1616)

Plant protecting and regulating compositions

Plant growth regulating compositions

Plural active ingredients

C504S142000, C504S206000, C504S320000, C504S358000

Reexamination Certificate

active

06468944

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a novel aqueous agriculturally acceptable herbicidal formulation, a process used to prepare it and a herbicidal method of using it in applying it to weeds or plants to kill and control weeds or plants.
The formulation, preferably a herbicidally efficacious formulation, comprises an effective amount of an agriculturally acceptable salt of N-phosphonomethylglycine and a herbicidally effective amount of at least one agriculturally acceptable fatty acid or a salt thereof or a mixture of fatty acids and a salt(s) thereof or a mixture of salts of a fatty acid(s) giving in an aqueous solution to be applied to plants or a desired locus a pH in a desired range. Other ingredients are optional, including surfactant(s), antifoam(s), antimicrobial(s) or one or more additional pesticides including herbicides, insecticides and fungicides. As used herein, the term “agriculturally acceptable” includes residential and industrial uses.
DESCRIPTION OF THE PRIOR ART
Glyphosate (N-phosphonomethylglycine) well-known as an effective herbicide is an organic acid, and is relatively insoluble in water. Therefore, glyphosate is normally formulated and applied as a water-soluble salt, especially as the isopropylamine salt (IPA salt).
Various formulations of glyphosate are disclosed in U.S. Pat. Nos. 4,405,531 issued to John E. Franz on Sep. 20, 1983; 3,799,580 issued to John E. Franz on Mar. 26, 1974; and 4,840,659 issued to John E. Franz on Jun. 20, 1989. These patents are incorporated herein by reference in their entirety. Roundups herbicide an aqueous concentrate comprising the IPA salt of glyphosate is sold by Monsanto Company as an aqueous concentrate formulation which is normally diluted in water prior to application.
Sharpshooter(TM) Herbicide Concentrate from Safer Inc. is said to contain fatty acid(s) as active ingredients such as those having 8 to 12 carbon atoms and mixtures thereof. It is believed used as a vegetation suppression agent.
SharpShooter(TM) is non-selective, and shows the result of its contact with weeds and unwanted vegetation in the form of necrosis, leaf burn, desiccation, wilting and the like. Typical fatty acids known to produce such symptoms are pelargonic and n-capric acid.
Pelargonic acid referred to also as nonanoic acid, nonylic acid and nonoic acid has the empirical formula C
9
H
18
O
2
.
n-Capric acid known also as n-decanoic acid, has the empirical formula C
10
H
20
O
2
.
PCT/US88/03582 (WO89/03178) of Safer, Inc. discloses a herbicidal composition and method for non-selectively controlling and retarding the growth rate and, if desired, causing extensive mortality of unwanted vegetation. The compositions consist essentially of one or more substances selected from the group consisting of aliphatic acids or their herbicidally active salts, disclosed preferably as octanoic acid, nonanoic acid, decanoic acid, n-decanoic acid, or dodecanoic acid, and an ammonium compound, preferably ammonium nitrate, sulfate or sulfanate. The composition is said to cause a plant mortality significantly in excess of the expected additive mortalities of the individual components.
U.S. Pat. No. 4,975,110 issued to George S. Puritch et al discloses an environmentally compatible herbicidal composition, consisting essentially of a herbicidally effective amount of a saturated linear monocarboxylic fatty acid selected from the group consisting of the acids caprylic, pelargonic, capric, undecanoic, lauric and mixtures thereof; and a surfactant component.
U.S. Pat. No. 3,870,503 issued to Louis G. Nickell on Mar. 11, 1975 discloses that sucrose yield of sugar-cane is increased by treating sugarcane a few weeks prior to harvest with a sugar cane ripening agent selected from the group consisting of n-valeric (pentanoic) acid and alkali metal salts or ethyl esters of an aliphatic monoacid having from one to five carbon atoms.
U.S. Pat. No. 4,134,754 issued to Otto L. Hoffmann on Jan. 16, 1979 discloses that the activity of barban is enhanced and variation of selectivity with climatic conditions is alleviated by applying to wild oats an effective amount of a composition comprising one part by weight carbon and at least four parts by weight of a polyunsaturated fatty acid exemplified by linolenic acid. The composition is preferably either dispersed in water with the aid of an emulsifier or dissolved in a mixture of water and a volatile organic solvent such as acetone.
U.S. Pat. No. 4,436,547 issued to Michael J. Sampson on Mar. 13, 1984 discloses that the effect of fungicides, herbicides, insecticides, nematocides and plant-growth regulators, is improved by co-administration of them with one or more of the following additives: carbohydrates, organic acids (particularly fatty acids and acids of the Krebs tricarboxylic acid cycle), vitamins and co-enzymes, purine and pyrimidine nucleosides and nucleotides, naturally occurring fats and oils, certain amino acids and (but not where the agricultural chemical is itself a plant-growth regulator) plant-growth regulators. The invention is said to provide compositions containing one or more of the said agricultural chemicals and one or more of the said additives and methods of improving the harvest of a given crop by applying to it one or more of the said agricultural chemicals and one or more of the additives, either simultaneously or within up to about ten days of one another.
U.S. Pat. No. 4,626,274 issued to Heinz Hausmann on Dec. 2, 1986 discloses that a known herbicide such as a urea, carboxylic acid ester, aminoacid, benzoic derivative, benzonitrile, phenol derivative, diphenyl ether, triazinone, triazinedione, heterocycle, dipyridil derivative or benzosulphonamide, is rendered more effective by being combined with a synthetic spreading agent such as a silicone oil, etc.
U.S. Pat. No. 4,966,728 issued to James L. Hazen, on Oct. 30, 1990 discloses herbicide adjuvants which are said to enhance the effectiveness of a broad spectrum of postemergent herbicides. These adjuvants preferably contain a low foaming nonionic surfactant, an anionic surfactant, a lower alkanol ester of a fatty acid, and a hydrocarbon oil component.
U.S. Pat. No. 4,902,334 issued to Azuma et al on Feb. 20, 1990 discloses a plant metabolism regulating agent comprising as an active ingredient an alpha, beta or beta, gamma-unsaturated carboxylic acid or its derivative. This concept is said to be useful for controlling the metabolism of a plant, facilitating the growth of a beneficial plant such as cereals by inhibiting the growth of undesirable plants or eradicating them, regulating the growth of a plant and dwarfing a plant.
U.S. Pat. No. 4,904,645 issued to George S. Puritch et al on Feb. 27, 1990 discloses a combination of pyrethrum and fatty acid salt material which is said to provide a stable; commercially useful and environmentally safe pesticidal formulation. The specific composition comprises an aqueous solution having a pH within the range of 7.5 to 8.8; an aqueous solution comprising about 50% by weight of monocarboxylic acids and their alkali metal salts, where the acid mixture is at least 70% oleic acid and 6% linoleic acid; a pyrethrum extract; a solvent for the pyrethrum, which is preferably a 2-6 carbon alcohol; a trace amount of an antioxidant. The composition is said to be effective against insects of at least the orders Homoptera, Coleoptera, Dermaptera, Hemiptera, and Lepidoptera, and against crustacea of the order Isopoda.
OBJECTS OF THE INVENTION
An objective of this invention is to provide an aqueous concentrate or ready to apply formulation comprising glyphosate or a water soluble salt of glyphosate and a fatty acid or a salt thereof or a mixture of fatty acids and salt thereof or a mixture of salts of the fatty acid(s) such that the early burndown symptoms on plants of the fatty acid and/or its salt or mixtures thereof are seen and the long term herbicidal control achieved by the use of the glyphosate is maintained and not sacrificed, eliminated or reduced by the contact action of the fatty acid or its water soluble sal

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