# US 2013/0152649 A1 · Immobilization of fertilizer additives

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- Number: US 2013/0152649 A1
- Document ID: US20130152649A1
- Status: Published application
- Kind: A1
- Application number: 13/331,522
- Filed: 2011-12-20
- Published: 2013-06-20
- Earliest claimed: 2011-12-20
- Assignees: Honeywell International Inc.
- Inventors: James A. Kweeder; Dean J. Collamer
- Web page: https://patentgrep.com/patent/US20130152649A1

## CPC

- C05C 9/005: {Post-treatment}
- C05C 3/005: {Post-treatment}
- C05G 5/38: {layered or coated with wax or resins}
- 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

## Abstract

Fertilizer products, and methods of making fertilizer products are provided that include an additive, such as an agrochemical, coated onto a base fertilizer particle. The outer coating bonds to the inner coating and maintains the inner coating on the base fertilizer particle until the base fertilizer particle undergoes dissolution and releases the fertilizing component.

## Claims

### Claim 1

A method of making a fertilizer product, the method comprising steps of:
providing a base fertilizer particle comprising at least one fertilizing component;
applying an inner coating to the fertilizer particle to form a fertilizer-additive particle, the inner coating comprising at least a first layer, wherein the first layer comprises at least one additive;
applying a water insoluble outer coating to the fertilizer-additive particle to form the fertilizer product, wherein the outer coating bonds to the inner coating and maintains the inner coating on the base fertilizer particle until the base fertilizer particle undergoes dissolution and releases the fertilizing component.

### Claim 2 (depends on 1)

The method of claim 1, wherein the at least one fertilizing component of the base fertilizer particle is selected from the group consisting of nitrogen, phosphorous, potassium, potash, urea, ammonium salts including ammonium sulfate, ammonium nitrate, ammonium sulfate nitrate, and combinations thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein the base fertilizer particle is formed by processes selected from the group consisting of crystallization, granulation, and prillling.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first layer is applied to the base fertilizer particle as a liquid.

### Claim 5 (depends on 1)

The method of claim 1, wherein the additive is a solid, and the first layer further comprises a binding agent.

### Claim 6 (depends on 1)

The method of claim 1, wherein the additive is a solid, and the first layer further comprises a flow agent.

### Claim 7 (depends on 6)

The method of claim 6, wherein the flow agent comprises amorphous sodium aluminum silicate.

### Claim 8 (depends on 1)

The method of claim 1, wherein the inner coating further comprises a second layer that is a sealing layer.

### Claim 9 (depends on 8)

The method of claim 8, wherein the sealing layer comprises a wax-type dedust/anti-cake material.

### Claim 10 (depends on 1)

The method of claim 1, wherein the at least one fertilizing component comprises urea, and the additive comprises an urease inhibitor.

### Claim 11 (depends on 1)

The method of claim 1, wherein the at least one fertilizing component comprises ammonium sulfate, and the additive comprises dicyanodiamide.

### Claim 12 (depends on 1)

The method of claim 1, wherein the outer coating is a wax.

### Claim 13 (depends on 1)

The method of claim 1, wherein the outer coating is an oil based coating.

### Claim 14

A method of making a fertilizer product, the method comprising steps of:
providing a base fertilizer particle comprising at least one fertilizing component;
applying an inner coating to the fertilizer particle to form a fertilizer-additive particle, the inner coating comprising a first layer and a second layer, wherein the first layer comprises at least one additive, and the second layer is a sealing layer;
applying a water insoluble outer coating to the fertilizer-additive particle to form the fertilizer product, wherein the outer coating bonds to the inner coating and maintains the inner coating on the base fertilizer particle until the base fertilizer particle undergoes dissolution and releases the fertilizing component.

### Claim 15 (depends on 12)

The method of claim 12, wherein the at least one fertilizing component of the base fertilizer particle is selected from the group consisting of nitrogen, phosphorous, potassium, potash, urea, ammonium salts including ammonium sulfate, ammonium nitrate, ammonium sulfate nitrate, and combinations thereof.

### Claim 16 (depends on 12)

The method of claim 12, wherein the additive is a solid, and the first layer further comprises a flow agent.

### Claim 17 (depends on 16)

The method of claim 16, wherein the flow agent comprises amorphous sodium aluminum silicate.

### Claim 18 (depends on 17)

The method of claim 17, wherein the at least one fertilizing component comprises ammonium sulfate, and the additive comprises dicyanodiamide.

### Claim 19 (depends on 12)

The method of claim 12, wherein the outer coating is a wax.

### Claim 20 (depends on 12)

The method of claim 12, wherein the outer coating is an oil based coating.