Methods of forming superabsorbent polymer products for use in agriculture
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08H-005/04
C08H-005/00
A01C-001/06
출원번호
US-0762956
(2004-01-21)
발명자
/ 주소
Doane,Steven William
Doane,William McKee
출원인 / 주소
Doane,Steven William
Doane,William McKee
대리인 / 주소
Stoel Rives LLP
인용정보
피인용 횟수 :
11인용 특허 :
9
초록▼
Methods of making and using a superabsorbent starch graft copolymer involve producing starch graft copolymers having particle sizes useful in granule applicators for application to agricultural fields. Starch graft copolymers applied to field crops provide excellent anti-crusting properties, increa
Methods of making and using a superabsorbent starch graft copolymer involve producing starch graft copolymers having particle sizes useful in granule applicators for application to agricultural fields. Starch graft copolymers applied to field crops provide excellent anti-crusting properties, increased seed germination and stand, increased crop growth, increased yields, and reduced water requirements.
대표청구항▼
The invention claimed is: 1. A method of producing a superabsorbent polymer product for use in agricultural applications, comprising: providing grafting reactants and a starch; graft polymerizing the grafting reactants onto the starch to form a starch graft copolymer; saponifying the starch graft c
The invention claimed is: 1. A method of producing a superabsorbent polymer product for use in agricultural applications, comprising: providing grafting reactants and a starch; graft polymerizing the grafting reactants onto the starch to form a starch graft copolymer; saponifying the starch graft copolymer; precipitating the starch graft copolymer; and forming granules of superabsorbent polymer product by pelletizing the starch graft copolymer, the granules having a size that is between about 5 mesh and about 25 mesh and a density that is between about 30 pounds per cubic foot and about 35 pounds per cubic foot. 2. The method of claim 1, wherein the grafting reactants include an initiator and an acrylonitrile. 3. The method of claim 2, wherein the grafting reactants further include a chemical selected from a group consisting essentially of acrylic acid, acrylamide, and 2-acrylonitrile-2-methyl-propanesulfonic acid. 4. The method of claim 2, wherein the starch and the acrylonitrile are present in a weight ratio of between about 1:2 and about 1:5. 5. The method of claim 2, wherein the initiator is a cerium salt. 6. The method of claim 2, wherein the initiator is ceric ammonium nitrate. 7. The method of claim 1, wherein the starch is selected from a group consisting essentially of pure starches, flours, and meals. 8. The method of claim 1, wherein the starch is a gelatinized starch. 9. The method of claim 1, wherein the starch is cornstarch. 10. The method of claim 1, wherein the size is between about 8 mesh and about 25 mesh. 11. The method of claim 1, wherein precipitating the saponified starch graft copolymer involves mixing an alcohol with the saponified starch graft copolymer. 12. The method of claim 11, wherein the alcohol is selected from a group consisting essentially of methanol, ethanol, propanol, and isopropanol. 13. The method of claim 1, wherein the process of pelletizing includes extruding the starch graft copolymer into strands and grinding the strands to form the granules. 14. The method of claim 1, further comprising: drying the granules of superabsorbent polymer product. 15. A method of producing a superabsorbent polymer product for use in agricultural applications, comprising: graft polymerizing grafting reactants onto a starch to form a starch graft copolymer; saponifying the starch graft copolymer; precipitating the starch graft copolymer; and forming granules of superabsorbent polymer product by passing the starch graft copolymer through a die plate, the granules having a size that is between about 5 mesh and about 25 mesh and a density that is between about 30 pounds per cubic foot and about 35 pounds per cubic foot. 16. The method of claim 15, wherein the grafting reactants include an initiator and an acrylonitrile. 17. The method of claim 15, wherein the grafting reactants further include a chemical selected from a group consisting essentially of acrylic acid, acrylamide, and 2-acrylonitrile-2-methyl-propanesulfonic acid. 18. The method of claim 16, wherein the starch and the acrylonitrile are present in a weight ratio of between about 1:2 and about 1:5. 19. The method of claim 16, wherein the initiator is a cerium salt. 20. The method of claim 15, wherein the starch is selected from a group consisting essentially of pure starches, flours, and meals. 21. The method of claim 15, wherein the starch is a gelatinized starch. 22. The method of claim 15, wherein the starch is cornstarch. 23. The method of claim 15, wherein the size is between about 8 mesh and about 25 mesh. 24. The method of claim 15, further comprising: drying the granules of superabsorbent polymer product.
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이 특허에 인용된 특허 (9)
Jones Duane A. (Minneapolis MN) Elmquist Lyle F. (St. Paul MN), Absorbent starch graft polymer and method of its preparation.
Fanta George F. (Peoria IL) Stout Edward I. (Peoria IL) Doane William M. (Morton IL), Highly absorbent graft copolymers of polyhydroxy polymers, acrylonitrile, and acrylic comonomers.
Fanta George F. (Peoria IL) Stout Edward I. (Waco TX) Doane William M. (Morton IL), Highly absorbent polyhydroxy polymer graft copolymers without saponification.
Weaver Mary Ollidene (Peoria IL) Bagley Edward B. (Morton IL) Fanta George F. (Peoria IL) Doane William M. (Morton IL), Highly absorbent starch-containing polymeric compositions.
Weaver Mary Ollidene (Peoria IL) Bagley Edward B. (Morton IL) Fanta George F. (Peoria IL) Doane William M. (Morton IL), Highly-absorbent starch-containing polymeric compositions.
Weaver Mary Ollidene (Peoria IL) Bagley Edward B. (Morton IL) Fanta George F. (Peoria IL) Doane William M. (Morton IL), Immobilization of enzymes with a starch-graft copolymer.
Weaver Mary Ollidene (Peoria IL) Bagley Edward B. (Morton IL) Fanta George F. (Peoria IL) Doane William M. (Morton IL), Method of reducing water content of emulsions, suspensions, and dispersions with highly absorbent starch-containing poly.
Doane,William McKee; Doane,Steven William; Savich,Milan H., Methods of making and using a superabsorbent polymer product including a bioactive, growth-promoting additive.
Savich,Milan H.; Olson,Gary S.; Clark,Eddie W.; Doane,William McKee; Doane,Steven William, Superabsorbent polymer products including a beneficial additive and methods of making and application.
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