# US 10,118,867 B2 · Fertiliser coating containing micronutrients

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- Number: US 10,118,867 B2
- Document ID: US10118867B2
- Status: Granted
- Kind: B2
- Application number: 15/921,170
- Filed: 2018-03-14
- Published: 2018-07-19
- Granted: 2018-11-06
- Earliest claimed: 2013-02-20
- Assignees: Yara UK Limited
- Applicants: Yara UK Limited
- Inventors: Stuart Charles Ward; Victoria Anne Butler; Torstein Obrestad; Terje Tande
- Web page: https://patentgrep.com/patent/US10118867B2

## CPC

- C05C 9/005: {Post-treatment}
- C05B 17/00: Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
- C05C 1/00: Ammonium nitrate fertilisers
- C05C 5/005: {Post-treatment}
- C05C 5/04: containing calcium nitrate
- C05D 9/02: containing trace elements
- C05G 5/27: Dispersions, e.g. suspensions or emulsions
- C05G 5/30: Layered or coated, e.g. dust-preventing coatings
- C05C: NITROGENOUS FERTILISERS
- C05B: PHOSPHATIC FERTILISERS
- C05D: INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- 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

A single-step method for preparing a free-flowing, non-dusting micronutrient-coated particulate solid fertiliser material, the method comprising applying a single fluid onto particulate solid fertiliser material at ambient temperature without chemical reaction or chelation, said single fluid comprising a suspension of one or more micronutrient materials in an oil.

## Claims

### Claim 1

A method of preparing an oil-based suspension of a micronutrient material, the method comprising blending an oil with particles of a compound containing the micronutrient material to produce a suspension which is pumpable at ambient temperature; wherein 90% of the particles in the micronutrient material have sizes between 0.1 and 50 μm; and wherein the suspension has a solids loading in the range 30 to 80 weight %.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising adding a dispersant to the oil prior to or during formation of the suspension.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising adding a rheology agent, thickener or anti-settling agent to the oil prior to or during formation of the suspension.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising adding a colorant to the oil.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the suspension has a viscosity in the range 500 to 6000 cPs at 20° C. measured on a Brookfield LVD viscometer using spindle 3 at 12 rpm.

### Claim 6 (depends on 1)

The method according to claim 1, wherein 90% of the particles in the micronutrient material have sizes between 0.1 and 20 μm.

### Claim 7 (depends on 5)

The method according to claim 5 wherein the suspension has a viscosity in the range 2000 to 5000 cPs at 20° C. measured on a Brookfield LVD viscometer using spindle 3 at 12 rpm.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the suspension has a solids loading in the range of 50 to 80 weight %.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the method of preparing the oil-based suspension is essentially water-free.