Microencapsulated nitrification inhibitor compositions

Patent metadata

Field	Value
Publication number	US-2017362136-A1
Application number	US-201515540820-A
Country	US
Kind code	A1
Filing date	Dec 23, 2015
Priority date	Dec 31, 2014
Publication date	Dec 21, 2017
Grant date	—

Abstract

The present invention relates to an improved nitrification inhibitor composition and its use in agricultural applications.

First claim

1 . A microcapsule suspension formulation comprising:
(a) a suspended phase of a plurality of microcapsules, said microcapsules having a volume median particle size of from about 1 to about 10 microns, wherein a microcapsule comprises:
(1) a microcapsule wall produced by an interfacial polycondensation reaction between a polymeric isocyanate and a polyamine to form a polyurea shell having a weight percentage of about 0.2 to about 15 percent of a total weight of the microcapsule suspension formulation, and
(2) a compound encapsulated within the polyurea shell wherein said compound is 2-chloro-6-(trichloromethyl)pyridine; and
(b) an aqueous phase including at least one polymeric crystal growth inhibitor.

2 . The microcapsule suspension formulation according to claim 1 , wherein the at least one polymeric crystal growth inhibitor reduces formation of crystalline 2-chloro-6-(trichloromethyl)pyridine in the aqueous phase of the suspension.

3 . The microcapsule suspension formulation according to claim 1 , wherein the at least one polymeric crystal growth inhibitor is selected from the group consisting of acrylate polymers and copolymers, methacrylate polymers and copolymers, nonionic polymeric surfactants, anionic polymeric surfactants, polymeric dispersants, nonionic block copolymers, lignosulfonates, sulfonated kraft lignin dispersants, polyalkylene glycols and glycol ethers, homopolymers of 1-ethenyl-2-pyrrolidinone, alkylated homopolymers of 1-ethenyl-2-pyrrolidinone, copolymers of 1-ethenyl-2-pyrrolidinone with 1-hexadecene or with vinyl acetate, modified polyvinyl alcohols containing carboxyl groups, poly(alkylene) ethanolamides, polyvinylamines, modified styrene acrylic polymers, and latexes.

4 . The microcapsule suspension formulation according to claim 1 , wherein the at least one polymeric crystal growth inhibitor is selected from the group consisting of: a nonionic polymeric surfactant with a low HLB including a hydrophilic portion of polyethylene oxide (PEG) and a hydrophobic portion of poly 12-hydroxystearic acid (pHSA) or alkyd resin, a poly(isobutylene) ethanolamide, a homopolymer of hexadecyl 1-ethenyl-2-pyrrolidinone, a polyethylene-polypropylene glycol monobutyl ether, a polymeric dispersant, a nonionic block copolymer, a high acrylate, vinyl acrylic copolymer latex, and a styrene-butadiene polymer latex.

5 . The microcapsule suspension formulation according to claim 1 , wherein the at least one polymeric crystal growth inhibitor is selected from the group consisting of: a nonionic polymeric surfactants with a low HLB including a hydrophilic portion of polyethylene oxide (PEG) and a hydrophobic portion of poly 12-hydroxystearic acid (pHSA) or alkyd resin, a poly(isobutylene) ethanolamide, and a homopolymer of hexadecyl 1-ethenyl-2-pyrrolidinone.

6 . The microcapsule suspension formulation according to claim 1 , wherein the at least one polymeric crystal growth inhibitor is selected from the group consisting of: a polyethylene-polypropylene glycol monobutyl ether, a polymeric dispersant, a nonionic block copolymer, a high acrylate, vinyl acrylic copolymer latex, and a styrene-butadiene polymer latex.

7 . The microcapsule suspension formulation according to claim 1 , wherein the at least one polymeric crystal growth inhibitor comprises a portion of the formulation in any weight percent range selected from the group consisting of: between about 2.00 wt. % and about 3.00 wt. %, between about 1.00 wt. % and about 5.00 wt. %, between about 0.50 wt. % and about 7.50 wt. %, and between about 0.01 wt. % and about 10.00 wt. %.

8 . A fertilizer composition comprising:
a nitrogen fertilizer; and the microcapsule suspension formulation of claim 1 .

9 . The fertilizer composition according to claim 8 wherein the nitrogen fertilizer is an ammonium or organic nitrogen fertilizer.

10 . A method of suppressing the nitrification of ammonium nitrogen in a growth medium comprising the step of:
applying the microcapsule suspension formulation of claim 1 to said growth medium.

11 . The method according to claim 10 , wherein the formulation is incorporated into the growth medium.

12 . The method according to claim 10 , wherein the formulation is applied to a growth medium surface.

13 . The method according to claim 10 , wherein the formulation is applied in combination with a pesticide or sequentially with a pesticide.

14 . The method according to claim 10 , wherein the formulation is applied with a nitrogen fertilizer.

15 . The method according to claim 14 , wherein the nitrogen fertilizer is urea ammonium nitrate.

16 . A method for reducing crystal formation in a microcapsule suspension formulation comprising the steps of:
preparing a microcapsule suspension formulation comprising:
(a) a suspended phase of a plurality of microcapsules, said microcapsules having a volume median particle size of from about 1 to about 10 microns, wherein a microcapsule comprises:
(1) a microcapsule wall produced by an interfacial polycondensation reaction between a polymeric isocyanate and a polyamine to form a polyurea shell having a weight percentage of about 0.2 to about 15 percent of a total weight of the microcapsule suspension formulation, and
(2) a compound encapsulated within the polyurea shell wherein said compound is 2-chloro-6-(trichloromethyl)pyridine; and

(b) an aqueous phase; and
combining the microcapsule suspension formulation with at least one polymeric crystal growth inhibitor.

17 . The method according to claim 16 , wherein the step of combining is performed substantially simultaneously with step of preparing the microcapsule suspension.

18 . The method according to according to claim 16 , wherein the step of combining is performed after the step of preparing the microcapsule suspension.

19 . The method according to according to claim 16 , wherein the step of combining is performed during transport of the microcapsule suspension.

20 . The method according to according to claim 16 , wherein the at least one polymeric crystal growth inhibitor is selected from the group consisting of: acrylate polymers and copolymers, methacrylate polymers and copolymers, nonionic polymeric surfactants, anionic polymeric surfactants, polymeric dispersants, nonionic block copolymers, lignosulfonates, sulfonated kraft lignin dispersants, polyalkylene glycols and glycol ethers, homopolymers of 1-ethenyl-2-pyrrolidinone, alkylated homopolymers of 1-ethenyl-2-pyrrolidinone, copolymers of 1-ethenyl-2-pyrrolidinone with 1-hexadecene or with vinyl acetate, modified polyvinyl alcohols containing carboxyl groups, poly(alkylene) ethanolamides, polyvinylamines, modified styrene acrylic polymers, and latexes.

21 . The method according to according to claim 16 , wherein the at least one polymeric crystal growth inhibitor is selected from the group consisting of: a nonionic polymeric surfactant with a low HLB containing a hydrophilic portion of polyethylene oxide (PEG) and a hydrophobic portion of poly 12-hydroxystearic acid (pHSA) or alkyd resin, a poly(isobutylene) ethanolamide, a homopolymer of hexadecyl 1-ethenyl-2-pyrrolidinone, a polyethylene-polypropylene glycol monobutyl ether, a polymeric dispersant, a nonionic block copolymer, a high acrylate, vinyl acrylic copolymer latex, and a styrene-butadiene polymer latex.

22 . The method according to according to claim 16 , wherein the at least one polymeric crystal growth inhibitor is selected from the group consisting of: nonionic po

Assignees

• Dow Agrosciences Llc

Inventors

• Dave Hiteshkumar
• Liu Lei
• Boucher Jr Raymond E
• Powels Greg

Classifications

• C05G5/35 Primary

  Capsules, e.g. core-shell · CPC title

• C05G3/90

  for affecting the nitrification of ammonium compounds or urea in the soil · CPC title

• C05G5/27

  Dispersions, e.g. suspensions or emulsions · CPC title

• A01N43/40 Primary

  six-membered rings · CPC title

• A01N25/28

  Microcapsules {or nanocapsules} · CPC title