Superabsorbent polymers in agricultural applications

a technology of agricultural applications and polymers, applied in the field of superabsorbent polymer products, can solve the problems of high cost of machinery, high cost of removal, and high cost of disposal, and achieve the effect of increasing crop production

Inactive Publication Date: 2006-03-02
ABSORBENT TECHNOLOGIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] Certain methods of increasing crop production using a SAP produced by the above-described method are disclosed. One method involves applying the SAP directly to the soil. A second method involves coating a root or seed with the SAP. A third method involves forming a slurry of SAP and water (or another liquid) and applying the resulting slurry to a plant, root, seed, seedling, or directly to soil into which one of a plant, root, seed, or seedling will be planted.

Problems solved by technology

Saponification, however, may require expensive machinery and generates ammonia, which can be corrosive, costly to remove, and expensive to dispose of.
The resulting waste solutions may also be expensive to dispose of because they include potassium and ammonium salts and other extraneous salts.
Furthermore, acrylonitrile may be hazardous and expensive to dispose of.

Method used

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  • Superabsorbent polymers in agricultural applications
  • Superabsorbent polymers in agricultural applications
  • Superabsorbent polymers in agricultural applications

Examples

Experimental program
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example 1

[0047] Deionized water (2,000 ml) was added to cornstarch (200 g; Cargill Gel Instant 12030, manufactured by Cargill Food and Pharma Specialties, Inc. of Cedar Rapids, Iowa) in a 3-liter resin kettle. The combination was mixed until a uniform mixture was formed. Acrylic acid (200 g; 99% purity; City Chemical, LLC of West Haven, Conn.) was added to the cooled mixture and the resulting mixture was stirred for approximately five minutes. Next, acrylamide (100 g; 99% purity; City Chemical, LLC of West Haven, Conn.) was added to the mixture, and the resulting mixture was stirred for approximately five minutes. Then methylene bis-acrylamide (0.5 g dissolved in 50 ml of deionized water; Molecular Grade; 99% purity; manufactured by Promega Corporation of Madison, Wis.) was added to the mixture, and the resulting mixture was stirred for approximately five minutes. Lastly, ammonium persulfate (0.5 g dissolved in 50 ml of deionized water; Molecular Grade; 99% purity; manufactured by Cascade Co...

example 2

[0050] Deionized water (2,000 ml) was added to cornstarch (200 g; Corn Products #3005, Industrial Starch (pearl starch), manufactured by CPC International, Inc. of Westchester, Ill.) in a 3-liter resin kettle. The combination was mixed until a uniform mixture was formed. The mixture was then heated to between about 185° F. and about 190° F. using a heating jacket. The mixture was maintained at this temperature for approximately 30 minutes, at which time the heating jacket was turned off and the mixture was allowed to cool to 150° F.

[0051] Acrylic acid (200 g; 99% purity; City Chemical, LLC of West Haven, Conn.) was added to the cooled mixture and the resulting mixture was stirred for approximately five minutes. Next, acrylamide (100 g; 99% purity; City Chemical, LLC of West Haven, Conn.) was added to the mixture, and the resulting mixture was stirred for approximately five minutes. Then methylene bis-acrylamide (0.5 g dissolved in 50 ml of deionized water; Molecular Grade; 99% puri...

example 3

[0054] Deionized water (2,000 ml) was added to pregelatinized yellow corn flour (200 g; #01965-00, manufactured by Cargill Dry Corn Ingredients, Inc. of Paris, Ill.) in a 3-liter resin kettle. The combination was mixed until a uniform mixture was formed. Acrylic acid (200 g; 99% purity; City Chemical, LLC of West Haven, Conn.) was added to the cooled mixture and the resulting mixture was stirred for approximately five minutes. Next, acrylamide (100 g; 99% purity; City Chemical, LLC of West Haven, Conn.) was added to the mixture, and the resulting mixture was stirred for approximately five minutes. Then methylene bis-acrylamide (0.5 g dissolved in 50 ml of deionized water; Molecular Grade; 99% purity; manufactured by Promega Corporation of Madison, Wis.) was added to the mixture, and the resulting mixture was stirred for approximately five minutes. Lastly, ammonium persulfate (0.5 g dissolved in 50 ml of deionized water; Molecular Grade; 99% purity; manufactured by Cascade Columbia D...

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Abstract

Superabsorbent polymer (SAP) products for use in agricultural applications, and methods of making and using the same are disclosed. Certain of the SAPs include a monomer or a mixture of monomers, other than acrylonitrile, that is graft polymerized onto a starch in the presence of an initiator to form a starch graft copolymer that is cross-linked and the SAP product is isolated.

Description

RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60 / 604,894, filed Aug. 27, 2004 and entitled ALTERNATIVE MONOMERS FOR USE IN PREPARING A SUPERABSORBENT POLYMER PRODUCT, which is incorporated herein by reference.TECHNICAL FIELD [0002] The present disclosure relates to a superabsorbent polymer product and to methods of making and applying the superabsorbent polymer product. BACKGROUND [0003] Superabsorbent polymers (SAPS) are materials that imbibe or absorb at least 10 times their own weight in aqueous fluid and that retain the imbibed or absorbed aqueous fluid under moderate pressure. The imbibed or absorbed aqueous fluid is taken into the molecular structure of the SAP rather then being contained in pores from which the fluid could be eliminated by squeezing. Some SAPs can absorb up to 1,000 times their weight in aqueous fluid. [0004] One method of producing a SAP for use in agricultural applications involves graft poly...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08B37/00C08H8/00
CPCA01G13/02Y10T428/2982C08B31/00C08B31/006C08F251/00C08L51/02C08L101/14A01G13/0262Y10T428/2991Y10T428/254A01G2031/007C08L2666/24C08L2666/02A01G24/35C08B37/00
Inventor DOANE, WILLIAM MCKEEDOANE, STEVEN WILLIAMSAVICH, MILAN H.
Owner ABSORBENT TECHNOLOGIES INC
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