METHOD FOR COATING SEED

Abstract

The invention is directed to a method for preparing coated seed, to a coated seed obtainable by said method, and to the use of a wax in a powder formulation to reduce tackiness of the coated seed. The method for preparing coated seed comprisesapplying a seed coating composition to seed; and,directly thereafter contacting said coated seed with a powder formulation, wherein said powder formulation comprises a wax.

Claims

1. Method for preparing coated seed, said method comprising applying a seed coating composition to seed; and, directly thereafter contacting said coated seed with a powder formulation, wherein said powder formulation comprises a wax.

2. Method according to claim 1, wherein said coating composition comprises 0.5-50% by weight of the coating composition of a component that provides tackiness such that the resulting coated seed is more tacky than a coated seed obtained with the same coating composition lacking the component that provides tackiness.

3. Method according to claim 1 or 2, wherein the period between having applied all seed coating composition to the seed and contacting the coated seed with the powder formulation is 30 seconds or less.

4. Method according to claim 1, wherein the amount of seed coating composition applied to said seed is in the range of 0.5-50 g/kg seed.

5. Method according to claim 1, wherein the amount of said powder formulation applied to said coated seed is in the range of 0.5-6% by total weight of dry uncoated seed; and/or in the range of 0.5-20% by total weight of the coating.

6. Method according to claim 1, wherein said seed coating composition is applied to said seed in a period ranging from 1-180 seconds.

7. Method according to claim 1, wherein said powder formulation is applied to said coated seed in a period ranging from 0.1-10 seconds.

8. Method according to claim 1, wherein said coated seed is contacted with said powder formulation for a period ranging from 1-30 seconds.

9. Method according to claim 1, wherein the powder formulation comprises 1-100% by total weight of the powder formulation of wax.

10. Method according to claim 1, wherein the wax is selected from the group consisting of natural wax, mineral wax and synthetic wax.

11. Method according to claim 1, wherein the powder formulation further comprises one or more selected from the group consisting of talc, mica, kaolin, calcium carbonate, silica, silicate, barium sulphate, and calcium sulphate.

12. Method according to claim 1, wherein the powder formulation has an average particle size as determined by laser diffraction particle size analysis of 2-200 m.

13. Method according to claim 2, wherein said component providing tackiness comprises one or more selected from the group consisting of a solvent, an active ingredient, a nutrient, a flow agent, a wetting agent, a spreading agent, a binder, and an oil.

14. Method according to claim 1, wherein the seed coating composition comprises a plant protecting agent in an amount of 27-80% by total weight of the seed coating composition.

15. Method according to claim 1, wherein the coating composition and the powder formulation are applied to the seed in the same container.

16. Coated seed prepared by the method according to claim 1.

17. A method for reducing the tackiness of coated seed comprising applying said a powder formulation comprising wax directly after a coating composition has been applied to the seed.

18. Method according to claim 17 wherein the wax is selected from the group consisting of natural wax, mineral wax and synthetic wax.

19. Method according to claim 10, wherein the wax is selected from the group consisting of polyethylene wax, carnauba wax, paraffin wax, polypropylene wax, oxidised polyethylene wax, montan wax, Fischer-Tropsch wax, amide wax, ethylene-acrylic acid wax, polyolefin wax, ethylene bis stearamide wax, bees wax, lanolin wax, and vegetable wax.

Description

EXAMPLES

Example 1

[0075] Corn seed was coated with a seed coating composition. Film coat formulation DISCO AG Red L-350 is commercially available from INCOTEC. It is a water-based, red film coat liquid typically used for corn seed.

[0076] The seed coating compositions were mixed with Royal Flo (fungicide active ingredient obtainable from Chemical Agrosava), Maxim XL (fungicide active ingredient obtainable from Syngenta) and Sonido (pesticide active ingredient obtainable from Bayer CropScience). 1.0 or 2.0 ml per kg corn seed of the DISCO formulation was mixed with 3.35 ml per kg corn seed of Royal Flo, 0.75 ml per kg corn seed of Maxim XL, and 8.5 ml per kg of corn seed of Sonido. The resulting mixture was used as a seed coating composition for application on corn seed. Immediately after application of the seed coating composition (i.e. within 2-3 seconds), the coated seed was contacted with a powder formulation as shown in table 1. The wax indicated in table 1 is atomised ACRAWAX C obtainable from Lonza (N,N-ethylene bis(stearamide)) with an average particle size of 10 m. The component providing tackiness in this example is the pesitice active ingredient Sonido.

TABLE-US-00001 TABLE 1 DISCO L-350 Powder Contacting Resulting Sample [ml/kg] formulation time [s] coated seed 1 1.0 none 12-14 tacky 2 1.0 effect 10-12 moderately tacky pigment .sup.1) 3 1.0 wax 8-10 not tacky 4 1.0 mix A .sup.2) 10-12 tacky 5 1.0 mix B .sup.3) 10-12 slightly tacky 6 2.0 none 12 tacky 7 2.0 effect 10-12 moderately tacky pigment .sup.1) 8 2.0 wax 8-10 not tacky 9 2.0 mix A .sup.2) 10 moderately tacky 10 2.0 mix B .sup.3) 10-12 slightly tacky .sup.1) QolorTech Pearl QT-111 effect pigment having an average particle size of less than 15 m .sup.2) 90% by weight of Talcum Haichen (talc) mixed with 10% by weight of QolorTech Pearl QT-111 effect pigment having an average particle size of less than 15 m .sup.3) 90% by weight of Talcum Haichen (talc) mixed with 10% by weight of Ceridust 3715 (polar modified polyethylene wax) with an average particle size of 7.5-9.5 m.

Example 2

[0077] Linseed was coated with a seed coating composition. Film coat formulations DISCO AG Red L-551 and DISCO AG Red L-802 are commercially available from INCOTEC. Both these film coat formulations are water-based, red film coat liquids. DISCO AG Red L-551 is typically used for coating cereal seed. DISCO AG Red L-802 is typically used for coating linseed and pea seed.

[0078] The seed coating compositions were mixed with YaraVita Teprosyn Zn (nutrient ingredient obtainable from Yara), Prelude 20FS (fungicide active ingredient obtainable from BASF), Celest (fungicide active ingredient obtainable from Syngenta), Apron XL (fungicide active ingredient obtainable from Syngenta), and water as a solvent, as detailed in table 2 below. The resulting mixture was used as a seed coating composition for application on linseed. Immediately after application of the seed coating composition (i.e. within 2-3 seconds), the coated seed was contacted with a powder formulation as shown in table 3. The component providing tackiness in this example is the fungicide active ingredient Prelude 20FS.

TABLE-US-00002 TABLE 2 L-551 L-802 Teprosyn Prelude Celest Apron Water Coating [ml/kg] [ml/kg] [ml/kg] [ml/kg] [ml/kg] [ml/kg] [ml/kg] A 2.5 1.0 6.0 1.0 1.0 B 3.0 6.0 1.0 1.0 C 2.5 1.0 6.0 0.4 1.0 D 3.0 6.0 0.4 1.0 E 2.5 1.0 6.0 1.3 0.4 1.0 F 3.0 6.0 1.3 0.4 1.0

TABLE-US-00003 TABLE 3 Powder Contacting Resulting Sample Coating formulation time [s] coated seed 11 A none 12 non uniform, pink 12 B none 14 non uniform, tacky 13 B effect 8 shiny pink pigment .sup.1) 14 B wax A .sup.2) 3 non uniform, not tacky, moderately dusty 15 B wax B .sup.3) 3 non uniform, not tacky, not dusty 16 B mix A .sup.4) 4 moderately uniform, not dusty, pink 17 B mix B .sup.5) 4 moderately uniform, not dusty, red 18 C none 12 moderately uniform, 19 D none 14 tacky 20 D effect 8 shiny pink pigment .sup.1) 21 D wax A .sup.2) 3 non uniform, not tacky, moderately dusty 22 D wax B .sup.3) 3 moderately uniform, not tacky, not dusty 23 D mix A .sup.4) 4 uniform, not dusty, pink 24 D mix B .sup.5) 4 uniform, not dusty, red 25 E none 12 uniform, tacky 26 F none 14 tacky, red 27 F effect 8 shiny pink pigment .sup.1) 28 F wax A .sup.2) 3 uniform, not tacky, not dusty 29 F wax B .sup.3) 3 uniform, not tacky, not dusty 30 F mix A .sup.4) 4 uniform, not dusty, pink 31 F mix B .sup.5) 4 uniform, not dusty, red .sup.1) QolorTech Pearl QT-111 effect pigment having an average particle size of less than 15 m .sup.2) atomised ACRAWAX C obtainable from Lonza (N,N-ethylene bis(stearamide)) with an average particle size of 10 m .sup.3) powdered ACRAWAX C obtainable from Lonza (N,N-ethylene bis(stearamide)) with an average particle size of 130 m .sup.4) 90% by weight of Talcum Haichen (talc) mixed with 10% by weight of QolorTech Pearl QT-111 effect pigment having an average particle size of less than 15 m .sup.5) 90% by weight of Talcum Haichen (talc) mixed with 10% by weight of Ceridust 3715 (polar modified polyethylene wax) with an average particle size of 7.5-9.5 m.