# US 9,517,973 B2 · Solid urea fertilizer

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- Number: US 9,517,973 B2
- Document ID: US9517973B2
- Status: Granted
- Kind: B2
- Application number: 13/831,400
- Filed: 2013-03-14
- Published: 2013-10-24
- Granted: 2016-12-13
- Earliest claimed: 2006-06-23
- Assignees: Koch Agronomic Services, LLC
- Applicants: Koch Agronomic Services, LLC
- Inventors: Allen R. Sutton
- Web page: https://patentgrep.com/patent/US9517973B2

## CPC

- C05C 9/02: containing urea-formaldehyde condensates
- C05C 9/00: Fertilisers containing urea or urea compounds
- C05G 3/90: for affecting the nitrification of ammonium compounds or urea in the soil
- C05G 5/40: Fertilisers incorporated into a matrix
- Y02P 60/21: Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
- C05C: NITROGENOUS FERTILISERS
- C05G: MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS (organic fertilisers containing added bacterial cultures, mycelia, or the like C05F11/08; organic fertilisers containing plant vitamins or hormones C05F11/10); FERTILISERS CHARACTERISED BY THEIR FORM
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A solid urea fertilizer prepared by mixing a solid, flowable, urea formaldehyde polymer with a urea source, such as molten or solid urea to form a fertilizer that has favorable crush strength characteristics, low biuret content, and/or desirable storage and handling properties. The urea fertilizer may contain additionally, an aqueous urea formaldehyde solution or mixture. Optionally, the fertilizer may contain a urease inhibitor and/or a nitrification inhibitor.

## Claims

### Claim 1

A fertilizer comprising a urea source and treated polymethyl urea resin particles that are in a flowable form, wherein the polymethyl urea resin particles are treated so as to comprise a urease inhibitor and a nitrification inhibitor.

### Claim 2 (depends on 1)

The fertilizer of claim 1, wherein the content of the polymethyl urea resin particles in the fertilizer is in the range of about 0.01 to 12.0 weight %.

### Claim 3 (depends on 1)

The fertilizer of claim 1, wherein the polymethyl urea resin particles comprise from about 10 to 15 weight % water.

### Claim 4 (depends on 1)

The fertilizer of claim 1, wherein the polymethyl urea resin particles comprise from about 40 to 80 weight % water.

### Claim 5 (depends on 1)

The fertilizer of claim 1, wherein the fertilizer further comprises an aqueous solution or mixture of urea-formaldehyde (UF).

### Claim 6 (depends on 5)

The fertilizer of claim 5, wherein the UF is present in the range of about 0.01 to 10.0 weight %.

### Claim 7 (depends on 1)

The fertilizer of claim 1, wherein the urea source is solid urea or molten urea.

### Claim 8 (depends on 1)

The fertilizer of claim 1, wherein the urease inhibitor is N-(n-butyl) thiophosphoric triamide (NBPT).

### Claim 9 (depends on 1)

The fertilizer of claim 1, wherein the nitrification inhibitor is dicyandiamide (DCD).

### Claim 10

A composition comprising treated, flowable particles of a polymethyl urea resin, wherein the particles are treated so as to comprise a urease inhibitor and a nitrification inhibitor.

### Claim 11 (depends on 10)

The composition of claim 10, wherein treated, flowable particles of the polymethyl urea resin are in mixture with an aqueous solution or mixture of urea formaldehyde (UF).

### Claim 12 (depends on 11)

The composition of claim 11 further comprising another urea source.

### Claim 13 (depends on 10)

The composition of claim 10, wherein the urease inhibitor is N-(n-butyl) thiophosphoric triamide (NBPT).

### Claim 14 (depends on 10)

The composition of claim 10, wherein the nitrification inhibitor is dicyandiamide (DCD).

### Claim 15

A method of preparing a fertilizer composition comprising mixing treated, flowable particles of a polymethyl urea resin with a urea source, wherein the particles of the polymethyl urea resin are treated so as to comprise a urease inhibitor and a nitrification inhibitor.

### Claim 16 (depends on 15)

The method of claim 15, wherein the polymethyl urea resin comprises about 0.01 to 12.0 weight % of the fertilizer composition.

### Claim 17 (depends on 15)

The method of claim 15, wherein the urea source is solid urea or molten urea.