DE1542929A1 - Aqueous preparations of agrochemicals - Google Patents

Description

description to the patent application

KSLCO COMPANY, Corporation of Delaware

1010 Second Avenue, 1 San Diego, California, USA

Concerning aqueous preparations of agro-alcoholic alkalis .

Plant breeders deal with this on a regular basis Protection and monitoring of the growth of plants. To achieve this, spray plant areas with agrochemicals such as pesticides, Fungicides, growth modifiers for promoting the growth of plants or herbicides to kill unwanted plants, which is usually understood to mean weeds. Other agrochemicals are used to kill insects and plant pests such as flies, mosquitoes, Mites, ticks, hornworms, termites, lice and roundworms. In the description and in the claims is the term "agrochemicals" intended to

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include described.

Agrochemicals are usually in aqueous Solutions, suspensions or emulsions used to treat plants. The application procedures extend affect roots, stems, leaves, fruits or flowers and depend on the goal of each treatment ab · To be effective, the phytochemicals must remain in contact with the plants on which they are applied be attached. Furthermore, it is usually not in any way desirable for these treating materials to drift off onto adjacent surfaces. Usually, such treatment materials are applied lengthways, e.g. on planted areas Streets sprayed. When the active part of the spray drains off the crop, there will be a lot of it wasted and its effectiveness is lost, For example, the spray is a herbicide and drifts on neighboring farmland, it can destroy valuable crops. Similarly, the effectiveness of agrochemicals when applied is up Plant pests or animals or other objects increase when the chemicals get on the treated Adhere firmly to the animal or object.

The aim of the invention is to provide a new and useful method of application and processing

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of agrochemicals, increasing the adhesiveness of agrochemicals on plants, animals and surfaces treated with them is increased. additional The aim is to create an application method for plant treatment substances with which the treatment substances for plants can be limited to a given area. Finally, the aim of the invention is To create a new agrochemical preparation that adheres more strongly than before to plants, animals and surfaces treated with them.

Quite surprisingly it was found that. one or more of the above-mentioned objects can be achieved by introducing a relatively small amount of a hydrophilic colloid, which gives the aqueous preparation thixotropic properties, in particular a colloid of a xanthomonas and locust bean gum, in an aqueous carrier for agrochemicals . The total amount of hydrophilic colloid from Xanthomonas and locust bean gum is between about 0.10 % to about 2% by weight of the aqueous carrier component. Amounts between 0.2 and 1% by weight and preferably about 0.80 % of the aqueous solution are preferred.

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It has now been found that a mixture of a hydrophilic colloid of Xanthomonas and locust bean gum produces a synergistic effect, namely by increasing the viscosity of the aqueous agrochemical preparation. A synergistic increase in viscosity is bie at weight ratios of hydrophilic Xanthomonas colloid to locust bean gum of about 95 ί 5 about 5: 95 observed * A preferred range is EWisehen 80% hydrophilic Xanthomonas KoIIoid and Ϊ)% locust bean gum, as the forth in this area * · Pre-called synergistic effect gröeejftfcet, a], ^ at concentrations outside this range. A particularly preferred concentration range comprises about 10% by weight of a hydrophilic Xanthoraonas colloid for every 60 parts of carob bean gum, since the greatest increase in animal health was observed with such weight ratios. ·

Its preferred way of working to use a mixture of a hydrophilic Xanthomonas colloid and locust bean gum a single aqueous solution containing a hydrophilic colloid of Xanthomonas, locust bean gum and a suitable agrochemical or

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contains suitable agrochemicals. ¹ A slight viscosity szunahme can be established to the aqueous medium of the locust bean gum and the hydrophilic Xanthomonas colloid after addition. However, this increase in viscosity is not so great that it would prevent the use of the aqueous medium as an agrochemical, since this can still be pumped and sprayed with a nozzle.

Another method uses at least two aqueous solutions or mixtures, "at least one of which contains the hydrophilic Xanthomonas colloid and the other carob bean gum. The agrochemical can be added to one or both of these solutions or mixtures, which are then added to a mixing nozzle are mixed according to a technique known to those skilled in the art. When mixing the two solutions, these are subjected to high shear forces which contribute to the increase in viscosity of the mixture. Although the value of the The shear generated in the mixing nozzle is a factor in determining the value of the viscosity increase that was caused by mixing the two solutions, this is not critical to the present invention Variable represents · As the viscosity of the resulting mixture both from that used for mixing Shear value as well as the corresponding amounts of hydrophilic Xanthomonas colloid and carob bean

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Depending on the rubber, the two factors can be varied against each other to achieve any desired result. If a nozzle is used which produces a relatively low gravity in mixing, the relative amounts of the hydrophilic colloid of Xanthomonas and locust bean gum can be varied or the total amount of hydrophilic colloid of Xanthomonas and locust bean gum can be increased to accommodate the low shear mixing to compensate. On the other hand, if the nozzle _# generates a relatively high weight, the total amount of Xanthomonas hydrophilic colloid and locust bean gum can be reduced.

For example , in the present method of applying an agrochemical, e.g. a herbicide, to plants, the hydrophilic colloid Xanthomonas campestris mixed with carob bean gum can be dispersed or dissolved in water, in a total concentration of 1/2 to 1 wt. Although much lower concentrations are often common, 1 % of the soluble dimethylamine salt of 2,4-dichlorophenoxyacetic acid, which is a well known herbicide, can be added to this solution or dispersion. The herbicide solution thus prepared from a water-soluble hydrophilic colloid of Xanthomonas campestris

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and \ Johann! sbrotbohnengumnii, although considerable thicker than water, easily in the devices used in the technical application of herbicides purapbat.

The aqueous solutions or dispersions of the soluble dimethylamine salt of 2, ^ - dichlorophenoxyacetic acid can be formed by adding all of the additives to water to make a single solution or dispersion from the herbicide, the hydrophilic colloid of Xanthomonas and the carob bean gum. Vice versa An effective herbicide solution or dispersion can be formed by using a hydrophilic Xanthomonas collous mixed with water to form a mixture or solution, carob bean gum and Water is added to form another mixture or solution, the soluble dimethylarain salt of 2, ^ - dichlorophenoxyacetic acid to either or both of these solutions and the two solutions in one High shear nozzle just before spraying of the herbicide mixed on the weeds.

In the same example for the application of an agrochemical reference was made to the application of a herbicide to plants. The surprising effectiveness of the inventive Procedure for this purpose extends

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also on the use of agrochemicals in aqueous Solutions, suspensions or emulsions as spray mist for animals, for insect control and. similar ..

The inventive method can be both used also for the application of treatment substances with native devices than with devices from the air.

When using the method according to the invention for the application of agrochemicals, the originally prepared solutions, suspensions and / or emulsions can be relatively viscous when measured in a Brookfield viscometer or a similar device. However, if they are subjected to a pump pressure or the like, they have a viscosity that comes close to that of a low-viscosity material . On leaving the spray cans, the viscosity of these substances also increases considerably and thus results in a semi-gelatinous character that restricts the flow to the intended area to be treated even under unfavorable conditions.

Due to its »semi-gelatinous character, the Agrochemical stuck to the leaves, stems, etc., on which it is sprayed. It does not tend to run out

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as is the case with simple aqueous solutions of agrochemicals. This way it becomes effective increased, due to the increased contact with vegetation and the like, whereupon it were sprayed.

The practical importance of the invention Process is that agrochemicals aaaf the basis aqueous carrier can be prepared in a conventional manner, easily transferred, pumped and easily sprayed can. Furthermore, a spray from this resists being driven off by wind, covering * the desired surface thorough, maintains this coating firmly and thereby results in an effective and comprehensive application and Application of the active ingredients to the desired surface without causing waste Drying out or loss due to abrasion on surrounding surfaces.

The treating agents to which the present invention can be applied are in the form of solids sold in crystal and powder form and as liquids. Of course, to produce the aqueous mixture of a water-soluble hydrophilic colloid of Xanthomonas, bread bean gum and a treatment aterlal, if necessary or desired is, 'known stabilizers, separating and / or emulsifying

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Means used to prevent a disproportionate amount of money to create a uniform mixture.

In the example given above, reference was made to such a hydrophilic Xanthomonas colloid which was produced by the bacterium Xanthomonas campestris. This colloidal substance is a polymer that contains residues of mannose, glucose, potassium glucuronate and acetyl. The potassium content in such a colloid can be replaced by various other cations without a substantial change in the property of the substance for the intended purposes. Dae colloid which is a exocellularer fabric with a high molecular weight can be produced by the bacterium Xanthomonas campestris are formed, namely by whole culture fermentation of a medium containing 2 bie 5% commercial glucose, an organic Sticketoffquelle, dipotassium hydrogen phosphate, and appropriate "trace elements. The exposure time is about 96 hours at 26 ⁰ O under aerobic conditions. For the production of the colloid, corn steep water or soluble dry residues from distillery processes (stillage) are expediently used as the organic nitrogen source. In order to stimulate the bacteria to grow vigorously, the culture is expediently allowed to grow in two intermediate stages before the final inoculation. These steps can be carried out in a medium with a pH of about 7. In a first stage, a

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Transmission τοη a Agarschrägebene (agar-slant) are performed on a dilute glucose broth, and the bacteria can be grown 2h hours under vigorous stirring and under aeration at a temperature of about 3O ⁰ C. The culture obtained in this way can then be used for inoculating a larger volume with a higher proportion of glucose (f %) for a second intermediate stage. At this stage, you can see the Beaktion 2h hours under the same conditions can continue as in stage first The culture thus acidified for application to glucose by the above-mentioned first and second stages is then added to the final glucose medium. For the above manufacturing process for a hydrophilic colloid of Xanthomonas campestris, a loop full of organisms from the agar slope is sufficient for the first stage, which consists of 200 ml of the glucose medlum with nine times the volume of a 3 # Lgen.01uooe «aediuae. For the final stage, the material formed in the next stage can be mixed with 19 times the volume of final medium. A good final medium can contain 3 % glucose, 0, 5% soluble dry Bückstände of distilling processes (slurry), 0.5% dipotassium phosphate, 0.1 # magnesium sulfate having 7 molecules of water of crystallization and water. A satisfactory conversion in the output stage can be achieved if one diese96 h at 3O ⁰ C. vigorous stirring and with aeration

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Xanthomonas campestris, which is suitable for the according to the invention Purpose proved to be particularly suitable, can be obtained by precipitation of the clarified fermentation mixture with methanol will. The formed substance can be called a pseudoplastic, hydrophilic heteropolysaccharide colloid or as gum produced by the bacterium Xanthomonas campestris.

Additional Xanthomonas colloid material can be obtained by repeating of the above procedure and by using known Xanthomonas bacteria or organisms, e.g. Xanthomonas carotae, Xanthomonas incanae, Xanthomonas beganiae and Xanthomonas malvacearum, used instead of the bacterium Xanthomonas campestris.

In addition to the hydrophilic colloids of Xanthomonas produced by the above methods, hydrophilic colloids of Xanthomonas produced by a slightly modified method can be used. In this other process, the colloid material is not obtained by precipitation, which can be done, for example, in methanol, but the clarified mixture resulting from the final fermentation stage of the process is dried in the heat. For example, the hydrophilic colloid material can thereby be separated off; that the clarified Qärgemisch is sent through a drum dryer , which with steam of about

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0.2 kg / cm is heated. The dried film on the Troramel surface is then removed with a sharp knife or scraper.

Various dry methods can be used to separate the hydrophilic colloidal material of the present invention be used. For example, the hydrophilic colloidal material can be clarified by spray drying Separate fermentation solution.

To demonstrate the wide range of ratios in which a Xanthomonas hydrophilic colloid and locust bean gum synergistically increase viscosity, a number of aqueous solutions were formed with various ratios of Xanthomonas hydrophilic colloid and locust bean gum. The hydrophilic Xanthomonas colloid used was formed by the bacterium Xanthomonas campestrls according to the method already described. The colloid was separated from the final stage of fermentation by drying the clarified mixture, including a heated with steam of 0.20 kg / cm. Drum dryer was used. The dried colloidal material was removed from the drum surface with a sharp knife or scraper.

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In the following Table I, the total content of added hydrophilic colloid by Xanthomonas campestris and locust bean gum was for each experiment 1 wt -.% Of the total solution. The materials were mixed in the dry state, then added to distilled water and finally stirred for 15 minutes with a disk stirrer at 900 rpm. The disc stirrer consisted of a disc about 4 cm in diameter, which was divided into four radial blades. The wings protruded from the plane of the sole plate in such a way that the lower edges of each wing protruded about 3 mm below the plane of the disk and the upper edges of each wing protruded about 3 mm above the plane of the disk. During the subsequent stirring, the viscosity was measured directly with a Brookfleid viscometer model LVF, the botation speed being 60 U / raln.

Table I follows

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Table I.

Parts of Xanthomonas parts of Johannis viscosity of the Campestris Colloid Bread Bean Gum Solution (cP)

(Locust Bean Gum)

0 470

95 5660

90 10 770

80 20 1030

70 30 1260

60 ko 1510

50 50 I69O

40 .60 I860

30 70 1420

20 80 IO3O

10 90 600

5 95 360

0 100 36

Vi · can be seen from Table I, was a synergistic increase in viscosity at weight

ratios achieved, which moved between 95 parts of a hydrophilic Xanthomonas kollold with 5 parts of carob bean gum and between 5 parts of a hydrophilic Xanthomonas kollold with 95 parts of carob bean gum. The greatest increase in viscosity was at Qewichtsverhältnissen of 80: 80 observed, and the optimum Viskositätszu acquisition was seen in use of approximately 60 parts: bia 20

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Carob bean gum to 40 parts each of a hydrophilic Xanthomonas colloids.

The series of tests in Table I was repeated using the same ingredients and weight ratios, but using higher shear. In this case, the dry blended materials were added to distilled water which was mixed in a Waring mixer at high speed for 2 minutes. The results are shown in Table II.

Table II

Parts of Xanthomonas Parts of Johannis viscosity of the Campestrie colloid bread bean gum solution (cP)

(Locust Bean Gum)

0 610

95 5 820

90 10 1090

80 20 2850

70 30 3300

60 40 4150

50 50 4500

40 60 4750

30 70 4400

80 36OO

10 90 2200

5 95 1180

0 100 61

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From Table II it can be seen that the viscosity increase achieved on the size of the Stirrers occurring shear is pending. The greatest viscosity improvement occurred at weight ratios of 80:20 and 20:80, as indicated Table I can be seen and the maximum viscosity improvement was observed at weight ratios of approximately 60 parts of locust bean gum and 40 parts of a hydrophilic Xanthomonas collous.

To demonstrate the synergistic increase in viscosity that was achieved by mixing carob bean gum with a hydrophilic colloid from Xanthomonas, another series of tests was carried out to determine whether a wide variety of hydrophilic Xanthomonai colloids were used that were added to water and. b «i high concentration in a Waring-Mis rather 30 ietffeUi were stirred. The viscosity determinations were then made directly with a Brookfield Viacosimeter Model LVP using a spindle speed of 30 rpm. The particle size of the hydrophilic Xanthomonas colloid and the locust bean gum was selected so that 100 % of the fabric passed through a # 40 sieve. These test results are summarized in Table III.

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Table III Concentration viscous! -

Concentration of hydrophilic on locust bean the lanthomonas colloid bohnenguaml solution

(Locust Bean Gum) (cP)

I ₁ O% OCanthomonas canpestris 0.5 # Xanthomonas campestris

I ₁ O% Xanthomonas malvaoMrum 3CMl 3

0.5 % Xanthomonas malvacearum XMl 3

1.0 % Xanthomonas malvacearum H2

0.5 % Xanthomonas malvacearum R2

1.0 % Xanthomonat begoniae S9 0.5 % Xanthomonas begonias S9 1.0 % Xanthoeonae befoniae S3 0.5 % Xanthoaona begoniae S3 1.0 % Xanthomonas phaseoli 0.5 % Xanthomonas phaseoli 1.0 % Xanthomonas carotat XGII 0, 5 % Xanthoraonae oarotat XCII 1.0 % Xanthomonas fcnttfa ··· 0.5 % Xanthomonas incanae 1.0 % 0.5 %

0.5 %

0.5 %

0.5%
0.5 % 0.5 % 0.5 %

0.5 %

1800

20th

2800

1280

3800 1760 6400

1560 56OO 500 3800 20 2000 1000 4000 1800 7000

As shown below, resulted in a wide variety hydrophilic colloids of XanthomonaB have a synergistic effect

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Viscosity increases in an aqueous solution when these added together with carob bean gum became. The hydrophilic colloid of Xahthomonas was made in that for a hydrophilic colloid of Xanthomonas campestris specified species and species using different bacterial strains as shown in Table III is', were used.

The present invention is applicable to a wide variety of agrochemicals and mixtures thereof, as well as use carriers or extenders for this. The following are examples of chemicals which are used by the process according to the invention can be.

Example 1; Herbicide

Dimethyl 2,3,5 »6-tetrachloroterephthalate. 2,2-Diohlorpropionic acid, sodium salt 2,4,5-Trichlorophenoxyacetic acid, salts

and esters thereof. 2- (2,4-dichlorophenoxy) propionic acid

2,4-dichlorophenoxyacetic acid, salts and esters thereof

Example 2: Fungicide

N-trichloromethyl mercapto-4-cyclohexene

1,2-dicarboximide tetramethyl-thiuram-dlsulphide ¹ 12,3 »^ # 5» 6-hexachlorobenzene disodium ethylenedithiocarbamate

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Example 3: insect silk

I, 2 _f 4,5,6,7,8 _l 8-0ctachlor-3a, ^, 7? A-tetrahydro-'l ·, 7-methanoindane

1,1, l-trichloro-2,2-bis (p-chlorophenyl) -

eth'an, 73 ^ residue largely 0, P ¹ isomer

1,2,3,4,5 »6-Ηβχαοη1οΐ · ογ (ϊ1οηβ: χΒη with at least 99 % f-isomers

O.O-Dimethyl-s-d ^ -dicarbethoxyethyl) phosphorodithate

3- (1-methyl-2-pyrro41idyl) pyridine

Example ^ : pity

2- (p-tert-butylphenoxy) -isopropyl-2-chloro-

• ethyl sulfite

p-chlorophenyl-p-chlorobenzenesulfonate tetraethyl pyrophosphate
0,0-diethyl-s- (p-chlorophenylthiomethyl) -phosphorodlthionate

Example f ; Growth control agent

Tributyl-2 _f ^ -dichlorobenzylphosphonium chloride

2- (3-indole) butyric acid

1,2-DlhydΓO-pyΓidazln-3,6-dlon.

Patent claims

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Claims (1)

Patent in a ρ r ü ο h β 1. Aqueous preparation of agrochemicals, characterized in that this preparation contains about 0.1 to 2 Qew, - # of a mixture of a hydrophilic colloid of Xanthomonas and carob bean gum, based on its weight of water * 2. Preparation according to claim 1, characterized in that the mixture to the Xanthomonas Colloid and bean gum 0.2 to 1 wt. Ji _1, in particular 0.00 Qew.-Ji, is · 3 * Zubereltuag according to claim 1 or Z ₉ by the fact that a colloid of the bacterium Xanthomonas compreötrie is used as the xanthomon * colloid. 4. Preparation according to claim 1 or 2, characterized characterized in that the Xanthomonas colloid is a colloid of the bacterium Xanthomonas malvaoearum is used. BATH ORIGINAL 00 ^ .820 / 1792 5. Preparation according to claim 1 or 2, characterized characterized in that the Xanthomonas colloid is a colloid of the bacterium Xanthomonas carotae is used. 6. Preparation according to claim 1 or 2, characterized in that the Xanthomonas colloid a colloid of the bacterium Xanthomonas incanae is used. 7. Preparation according to claim 1 or 2, characterized in that the Xanthomonas colloid a colloid of the bacterium Xanthomonas begoniae is used. 8. Preparation according to claim 1 or 2, characterized in that a colloid dta Bakteriuas Xanthomonas phaeeoli is used as the Xanthomonas colloid * BATH ORIGINAL 009820/1792