Controlled-release type fertilizer with decreased floating property comprising polyoxyethylene alky(-aryl) ether and method for preparing the same

Patent metadata

Field	Value
Publication number	US-11377395-B2
Application number	US-201816646951-A
Country	US
Kind code	B2
Filing date	Sep 13, 2018
Priority date	Sep 13, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

The present invention relates to a controlled-release type fertilizer with remarkably decreased floating property, comprising a granular fertilizer core; a coating layer (shell) formed on the surface of the granular fertilizer core, and comprising olefin-based resin; and additives attached on the coating layer, and comprising polyoxyethylene alkyl(-aryl)ether.

First claim

The invention claimed is:

1. A controlled-release type fertilizer comprising;
a granular fertilizer core;
a coating layer formed on the surface of the granular fertilizer core, the coating layer comprising an olefin-based resin; and
additives attached on the coating layer, the additives comprising a polyoxyethylene alkyl(-aryl)ether, wherein the polyoxyethylene alkyl(-aryl)ether includes hydrophilic groups in an amount of 30 to 70 wt %, based on the total weight of the polyoxyethylene alkyl(-aryl)ether, and the controlled-release type fertilizer comprises the additives in an amount of 0.001 wt % to 0.05 wt %, based on the total weight of the controlled-release type fertilizer,
wherein the polyoxyethylene alkyl(-aryl)ether includes hydrophobic groups in an amount of 30 to 70 wt %, based on the total weight of polyoxyethylene alkyl(-aryl)ether, and
wherein the hydrophobic groups in the polyoxyethylene alkyl(-aryl)ether have a weight average molecular weight of 50 to 300.

2. The controlled-release type fertilizer according to claim 1 , wherein the additives further comprise inorganic powder.

3. The controlled-release type fertilizer according to claim 2 , wherein the inorganic powder has a specific surface area of 100 m 2 /g to 500 m 2 /g.

4. The controlled-release type fertilizer according to claim 2 , wherein the inorganic powder has a particle size of 1/1111 to 500/1111.

5. The controlled-release type fertilizer according to claim 2 , wherein the inorganic powder is hydrophilic inorganic powder having a hydroxyl group.

6. The controlled-release type fertilizer according to claim 2 , wherein the inorganic powder is included in an amount of 0.01 wt % to 1 wt %, based on the total weight of the controlled-release type fertilizer.

7. The controlled-release type fertilizer according to claim 1 , wherein the olefin-based resin is polyolefin or a copolymer of olefin and ethylene vinyl acetate.

8. The controlled-release type fertilizer according to claim 1 , wherein the hydrophilic groups in the polyoxyethylene alkyl(-aryl)ether have a weight average molecular weight of 100 to 1000.

9. The controlled-release type fertilizer of claim 1 , wherein the coating layer is a shell covering the granular fertilizer core and the additives are uniformly attached to the surface of the shell.

10. A method for preparing a controlled-release type fertilizer, comprising the steps of:
i) coating the surface of a granular fertilizer core with a coating composition comprising an olefin-based resin to form a first coating layer; and
ii) coating the first coating layer with liquid additives comprising a polyoxyethylene alkyl(-aryl)ether, wherein the polyoxyethylene alkyl(-aryl)ether includes hydrophilic groups in an amount of 30 to 70 wt %, based on the total weight of the polyoxyethylene alkyl(-aryl)ether, and
wherein the coating step ii) comprises adding the liquid additives in an amount of 0.001 wt % to 0.05 wt % based on the total weight of the controlled-release type fertilizer,
wherein the polyoxyethylene alkyl(-aryl)ether includes hydrophobic groups in an amount of 30 to 70 wt %, based on the total weight of polyoxyethylene alkyl(-aryl)ether, and
wherein the hydrophobic groups in the polyoxyethylene alkyl(-aryl)ether have a weight average molecular weight of 50 to 300.

11. The method of claim 10 , wherein the first coating layer in step (i) is a shell covering the granular fertilizer core.

Assignees

• Lg Chemical Ltd

Inventors

• KIM Mihee
• Joo Hyo Sook
• Park Eun Kyoung
• Choi Hyeon
• Yoon Ki Youl
• Lee Joon Seok

Classifications

• C05G5/37 Primary

  layered or coated with a polymer · CPC title

• C05G3/44 Primary

  for affecting solubility · CPC title

• C05G5/30 Primary

  Layered or coated, e.g. dust-preventing coatings · CPC title

• C05G3/50

  Surfactants; Emulsifiers · CPC title

• C05G5/12

  Granules or flakes · CPC title