Coated granular fertilizer, method for producing coated granular fertilizer, and fertilizer compostion

Patent metadata

Field	Value
Publication number	US-11001539-B2
Application number	US-201615757680-A
Country	US
Kind code	B2
Filing date	Sep 1, 2016
Priority date	Sep 11, 2015
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

Provided is a coated granular fertilizer, which includes a granular fertilizer and a resin coat that coats the granular fertilizer, in which the resin coat contains a urethane resin that is a polyaddition product between a polyisocyanate component and a polyol component, the polyisocyanate component includes an aromatic polyisocyanate, and the polyol component includes a castor oil-modified diol, an alkylene diol having 2 to 8 carbon atoms, and a compound having three or more hydroxyl groups.

First claim

The invention claimed is:

1. A method for producing a coated granular fertilizer that includes a granular fertilizer and a resin coat coating the granular fertilizer, the method comprising:
performing polyaddition of a polyol component and a polyisocyanate component, thereby forming the resin coat, wherein the polyol component is a mixture of: a castor oil modification product having 2 hydroxyl group per molecule; an alkylene diol having 4 to 6 carbon atoms; and a compound having three or more hydroxyl groups, wherein the compound having three or more hydroxyl groups includes a polyether polyol, which is a polymerization product between polyhydric alcohol having three or more hydroxyl group and an alkylene oxide, or a castor oil-modified polyol,
wherein the polyisocyanate component includes an aromatic polyisocyanate, and
the aromatic polyisocyanate component includes a compound having two or more benzene rings, each benzene ring having an isocyanate group.

2. The method according to claim 1 , wherein the polyhydric alcohol having three of more hydroxyl group comprises glycerin.

3. The method according to claim 1 , wherein the polyhydric alcohol having three of more hydroxyl group comprises trimethylolpropane.

4. The method according to claim 1 , wherein the polyhydric alcohol having three of more hydroxyl group comprises pentaerythritol.

5. The method according to claim 1 , wherein the alkylene oxide comprises ethylene oxide, propylene oxide, butylene oxide, or tetrahydrofuran.

6. A coated granular fertilizer, comprising:
a granular fertilizer; and
a resin coat coating the granular fertilizer,
wherein the resin coat contains a urethane resin, which is a polyaddition product between a polyisocyanate component and a polyol component,
the polyisocyanate component includes an aromatic polyisocyanate, and
the polyol component includes a castor oil-modified diol, an alkylene diol having 4 to 6 carbon atoms, and a compound having three or more hydroxyl groups,
wherein the compound having three or more hydroxyl groups includes a polyether polyol or a castor oil-modified polyol, wherein the polyether polyol is a polymerization product between a polyhydric alcohol having three of more hydroxyl group and an alkylene oxide, and
the aromatic polyisocyanate includes a compound having two or more benzene rings, each benzene ring having an isocyanate group.

7. The coated granular fertilizer according to claim 6 , wherein the content of the castor oil-modified diol is 6% to 93% by mass based on the total amount of the polyol component.

8. The coated granular fertilizer according to claim 6 , wherein the content of the alkylene diol is 4% to 25% by mass based on the total amount of the polyol component.

9. The coated granular fertilizer according to claim 6 , wherein the content of the compound having three or more hydroxyl groups is 2% to 87% by mass based on the total amount of the polyol component.

10. The coated granular fertilizer according to claim 6 , wherein the alkylene oxide comprises one selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, and combinations thereof.

11. The coating granular fertilizer according to claim 6 , wherein the polyhydric alcohol having three of more hydroxyl group comprises glycerin.

12. A coated granular fertilizer, comprising:
a granular fertilizer; and
a resin coat coating the granular fertilizer,
wherein the resin coat contains a urethane resin, which is a polyaddition product between a polyisocyanate component and a polyol component,
the polyisocyanate component includes an aromatic polyisocyanate, and
the polyol component includes a castor oil-modified diol, an alkylene diol having 4 to 6 carbon atoms, and a compound having three or more hydroxyl groups,
wherein the compound having three or more hydroxyl groups includes a polyether polyol or a castor oil-modified polyol, wherein the polyether polyol is a polymerization product between a polyhydric alcohol having three of more hydroxyl group and an alkylene oxide, and
the aromatic polyisocyanate includes a compound having two or more benzene rings, each benzene ring having an isocyanate group,
the content of the castor oil-modified diol is 6% to 93% by mass based on the total amount of the polyol component,
the content of the alkylene diol is 4% to 25% by mass based on the total amount of the polyol component, and
the content of the compound having three or more hydroxyl groups is 2% to 87% by mass based on the total amount of the polyol component.

Assignees

• Sumitomo Chemical Co

Inventors

• Sasakawa Mitsuhiro

Classifications

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• C08G18/6674

  with compounds of group C08G18/3203 · CPC title

• C08G18/4825 Primary

  Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C08G18/48

  Polyethers · CPC title

• C08G18/4277

  Caprolactone and/or substituted caprolactone · CPC title