Controlled release formulation for fertilizers

Details Controlled release formulation for fertilizers Controlled release formulation for fertilizers

1987-04-13

1988-12-06

Lander, Ferris H.

Chemistry: fertilizers

Processes and products

Organic material-containing

71 28, 71 29, 71 30, 71 6406, 71 6403, 71 6411, 71904, C05G 300, C05C 900, C05C 502, C05C 1100

Patent

active

047893915

ABSTRACT:
A hydrolyzed lignosulfonate-acrylonitrile graft copolymer matrix providing a slow release solubility to fertilizers. The hydrolysis of the graft copolymer of lignosulfonate and acrylonitrile may be carried out in the presence of an alkali in situ during the fertilizer manufacturing process or in a prehydrolysis step with subsequent use of the hydrolyzed copolymer in the fertilizer manufacturing process to provide a controlled release formulation for various fertilizers.

REFERENCES:
patent: 3697245 (1972-10-01), Dilday
CA 96 (18) 145844v, "Drilling Fluid Composition" Kelley et al., 1982.
CA 93 (24) 222092r, "Study on the Graft Copolymerization of Lignosulfonate and Acrylic Monomers" Chen et al, 1980.

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