Water-dispersible granules of suspoemulsions

Details Water-dispersible granules of suspoemulsions Water-dispersible granules of suspoemulsions

1995-05-19

2002-06-25

Clardy, S. Mark (Department: 1616)

Plant protecting and regulating compositions

Plant growth regulating compositions

Plural active ingredients

C504S367000, C514S431000, C514S521000, C514S952000

Reexamination Certificate

active

06410481

ABSTRACT:

The present invention relates to novel water-dispersible granules of mixtures of active substances for use in crop protection.
Water-dispersible granules (abbreviation: WG) are described in a series of patent applications as an environmentally friendly type of formulation, distinguished by a high degree of safety for the user and during transport and storage. The formulation type of water-dispersible granules is preferably used in the case of solid active substances of relatively high melting point (m.p.>65° C.). In most cases, the starting materials are aqueous dispersions which are spray-dried or granulated in a fluidized bed. Examples are described in EP-A-413,267, EP-A-388,867 and EP-A-224,845.
WG formulations can also be prepared of liquid active substances, by adsorbing the latter on a suitable carrier (EP-A-443,411).
Difficulties arise when it is intended to prepare a combined formulation of a solid active: substance which can be formulated in the form of an aqueous dispersion (m.p.>65° C.) and of a liquid active substance or a substance of low melting point, and/or when the second active substance (such as, for example, deltamethrin) must be present at the site of action in dissolved form if its best possible biological action is to be achieved.
Uncontrolled crystallization of the active substance of a low melting point during the preparation of the granules and after storage under warm conditions can result in a reduced biological action; agglomerations and the formation of larger particles can lead to blocked screens and jets.
Surprisingly, it has now been found that even suspoemulsions can be granulated by the fluidized-bed process. Suspoemulsions are aqueous dispersions of solids of sufficiently high melting point and in which the solution of a second active substance is emulsified.
The prerequisite for successful granulation of the abovementioned suspoemulsions is the selection of a solvent for the emulsifiable concentrate which does not evaporate during the granulation process.
The invention therefore relates to water-dispersible granules which contain
10 to 90% by weight, preferably 40 to 85% by weight, of at least one pesticidal active substance of sufficiently high melting point and which can be formulated in the form of an aqueous dispersion,
0.1 to 20% by weight, preferably 0.5 to 10% by weight, of at least one liquid pesticidal active substance pesticidal or active substance of low melting point and/or which is not sufficiently effective in solid form, this pesticidal active substance being in dissolved form, and
0.2 to 20% by weight, preferably 0.5 to 10% by weight, of a solvent or solvent mixture with low volatility.
Preferred granules are those in which the active substance which can be formulated in the form of an aqueous dispersion (m.p.>65° C.) is present in greater amounts based on weight, and the liquid active substance or active substance of low melting point, or active substance which is not sufficiently biologically active in the solid state, is present in smaller amounts.
The active substances are selected from the series of the herbicides, insecticides, fungicides, acaricides, nematicides, pheromones and repellants, preferably from the series of the herbicides and insecticides. If appropriate, the granules contain at least one safener.
Suitable active substances which can be formulated as a dispersion and which are present in the combined formulation as the principal component are, in particular, isoproturon and endosulfan. As liquid active substances or active substances of low melting point, or active substances which are not sufficiently biologically active in the solid state, are preferably employed: fluoroglycofen-ethyl, trifluralin, triazaphos and deltamethrin; particularly preferred are fluoroglycofen-ethyl and deltamethrin.
Only a few solvents do not evaporate, or to a minor extent only, at the high throughputs of heated gas (air or nitrogen/air mixtures) during fluidized-bed granulation. Moreover, the solvents must have a sufficiently great dissolving capacity for the liquid pesticidal active substance, or pesticidal active substance of low melting point or which is not sufficiently active in solid form, and they must be acceptable for use in agriculture. Solvents whose boiling range is above 170° C. (at, or calculated for, atmospheric pressure) are particularly suitable for this purpose.
It has been found that in particular the following solvents have a low volatility as well as good dissolving properties:
®Solvesso 200 (1), butyl diglycol acetate, ®Shellsol RA (2), ®Actrel 400 (3), ®Agsolex 8 (4), ®Agsolex 12 (5), ®Norpar 13 (6), ®Norpar 15 (7), ®Isopar V (8), ®Exsol D 100 (9), ®Shellsol K (10) and ®Shellsol R (11), the composition of which is as follows:
(1) Mixtures of alkylated naphthalenes, boiling range 219-282° C., manufacturer: Exxon.
(2) Mixtures of alkylated benzenes, boiling range 183-312° C., manufacturer: Shell.
(3) High-boiling mixture of aromatics, boiling range 332-355° C., manufacturer: Exxon.
(4) N-Octylpyrrolidone, boiling point (0.3 mm Hg) 100° C., manufacturer: GAF.
(5) N-Dodecylpyrrolidone, boiling point (0.3 mm Hg) 145° C., manufacturer: GAF.
(6) Aliphatic hydrocarbons, boiling range: 228-243° C., manufacturer: Exxon.
(7) Aliphatic hydrocarbons, boiling range: 252-272° C., manufacturer: Exxon.
(8) Aliphatic hydrocarbon, boiling range: 278-305° C., manufacturer: Exxon.
(9) Aliphatic hydrocarbon, boiling range: 233-263° C., manufacturer: Exxon.
(10) Aliphatic hydrocarbon, boiling range: 192-254° C., manufacturer: Shell.
(9) Aromatic hydrocarbon, boiling range: 203-267° C., manufacturer: Shell.
Mixtures of these solvents with each other are also suitable. Butyl diglycol acetate, ®Actrel 400, ®Agsolex 8 and ®Agsolex 12 are particularly useful.
If appropriate, the granules according to the invention additionally contain
1 to 12% by weight, preferably 4 to 8% by weight, of at least one wetting agent,
2 to 15% by weight, preferably 6 to 12% by weight, of at least one dispersant,
0.2 to 5% by weight, preferably 0.8 to 3% by weight, of at least one adhesive,
0.5 to 60% by weight, preferably 0.8 to 20% by weight, of inert substance, depending on active substance content, and
0.5 to 10% by weight, preferably 1 to 5% by weight, of at least one emulsifier.
Examples of wetting and dispersing agents which can be employed for the preparation of the aqueous dispersion of the active substance of high melting point are the following:
Wetting agents: secondary N-alkanesulfonate (for example ®Hostapur SAS, C
14
C
19
-olefin sulfonate sodium salt (for example ®Hostapur OS), disodium isodecylsulfomonosuccinate (for example ®Netzer IS), sodium lauryl sulfate (for example Texapon K12 or Texapon Z), sodium dodecylbenzenesulfonate (for example phenylsulfonate HS90), sodium oleoylmethyl tauride (for example ®Hostapon T), sodium dibutyl-naphthalenesulfonate (for example ®Leonil DB or ®Geropon NK, ®Nekal BX), alkyl diglycol ether sulfate sodium salt (for example ®Genapol LRO), sodium lauryl ether phosphate (for example ®Forlanit P), oxethylated polyarylphenol phosphate, neutralized with triethanol-amine or potassium hydroxide (for example ®Soprophor FL and ®Soprophor FL-K or HOE S3775, Hoechst AG), ethoxylated tributylphenols (for example ®Sapogenat TO80, T110), ethoxylated nonylphenols (for example ®Arkopal N100), isotrideca-nol polyglycol ethers (for example ®Genapol X-080), polymerization products of propylene oxide and: ethylene oxide (for example ®Genapol PF40), bis-mono-phosphate of a propylene oxide/ethylene oxide block copolymer, neutralized with potassium hydroxide (for example HOE S3618 K salt or ®Alkaphos MD12-116).
Dispersants: Ligninsulfonates, such as, for example, ®Vanisperse CB, ®Borresperse CA, ®Ufoxane 3a, ®Ultrazine Na, ®Hansa FE, Na salt of the sulfonated condensation product of formaldehyde with methylphenol such as, for example, ®Rapidamin Reserve C and D; naphthalenesulfonic acid/formaldehyde condensation products such as, for example, ®Dispersogen A; anionic condensation product of m-cresol, nonylphenol, sod

Affiliated with

Also associated with

Rating

Water-dispersible granules of suspoemulsions does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Water-dispersible granules of suspoemulsions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water-dispersible granules of suspoemulsions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2900887