Liquid formulations of urease inhibitors for fertilizers
OwnerGary David McKnight, David Bruce Parker +3inventors
InventorsGary David McKnight, David Bruce Parker, Yang Zehni, Ray Perkins, Wei Xu
Life of this patent
Estimating the term…
Abstract
An improved solvent system for the formulation and application of N-alkyl thiophosphoric triamide urease inhibitors. These formulations provide safety and performance benefits relative to existing alternatives and enable storage, transport and subsequent coating or blending with urea based or organic based fertilizers. These formulations are comprised primarily of environmentally friendly aprotic and protic solvents (particularly dimethyl sulfoxide and alcohols/polyols) to stabilize the urease inhibitor.
Claims19
A composition comprising:
- a. a nitrogen fertilizer comprised of urea and one or more members selected from the group consisting of a) urea formaldehyde polymer and b) dicyandiamide,
- b. a liquid solution comprised of a urease inhibitor that has been solubilized within an aprotic solvent wherein said aprotic solvent comprises dimethyl sulfoxide, wherein the composition comprises 45-5% of said urease inhibitor and 55-95% of dimethyl sulfoxide and wherein said urease inhibitor is N-(n-butyl) thiophosphoric triamide.
A composition comprising:
- a. a nitrogen fertilizer comprised of urea and one or more members selected from the group consisting of a) urea formaldehyde polymer and b) dicyandiamide,
- b. a liquid fertilizer additive comprised of urease inhibitor(s) that have been solubilized within polar aprotic solvents and one or more solvents selected from the group consisting of aprotic and protic solvents wherein said polar aprotic solvents comprise one or more members selected from the group consisting of:
- i. dimethyl sulfoxide, and
- ii. one or more sulfoxide(s) selected from the group consisting of dialkyl, diaryl, or alkylaryl sulfoxide(s) selected from the formula structure:
- R9S(O)xR10
- wherein
- 1. R9 and R10 are each independently a C1-C6 alkylene group, an aryl group, or C1-C3 alkylenearyl group,
- 2. or R9 and R10 with the sulfur to which they are attached form a 4 to 8 membered ring wherein R9 and R10 together are a C1-C6 alkylene group which optionally contains one or more atoms selected from the group consisting of O, S, Se, Te, N, and P in the ring,
- 3. x=1 or 2,
- wherein the composition comprises 75-5% of said urease inhibitors and 25-95% of said polar aprotic, said aprotic, and said protic solvents.
A composition comprising:
- a. a nitrogen fertilizer comprised of urea and one or more members selected from the group consisting of a) urea formaldehyde polymer and b) dicyandiamide,
- b. a liquid solution comprised of a urease inhibitor that has been solubilized within an aprotic solvent wherein said aprotic solvent comprises dimethyl sulfoxide, wherein the composition comprises 58.9-5% of said urease inhibitor and wherein said urease inhibitor is N-(n-butyl) thiophosphoric triamide.
Dependencies are inferred from the claim text.