Controlled release fertilizers made from cross-linked glyceride mixtures
AssigneeAgrium Advanced Technologies
InventorsROMEM AVDALA, Leslie L. Carstens, Garrard Lee Hargrove, Sriramakrishna Maruvada, Baozhong Xing
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Abstract
A controlled release fertilizer material comprising a particulate plant nutrient surrounded by a coating which is the reaction product of a mixture including a cross-linked polyol, an isocyanate and a wax is described. The cross-linked polyol is a reaction product of a polyhydroxyl compound, such as glycerol, and a triglyceride and the monoglyceride and/or diglyceride products are cross-linked with sulfur, oxygen and/or a peroxide cross-linking moiety, or are directly cross-linked at unsaturated sites in the monoglycerides and/or diglycerides.
Claims20
A controlled release fertilizer composition comprising a particulate plant nutrient coated with a coating of an isocyanate and at least one polyol comprising a mixture of cross-linked glycerides.
A controlled release fertilizer composition comprising a particulate plant nutrient coated with a coating of an isocyanate and at least one polyol comprising a mixture of monoglycerides and/or diglycerides, wherein the monoglycerides and/or diglycerides are cross-linked.
A controlled release fertilizer composition comprising a particulate plant nutrient coated with a coating of an isocyanate and at least one polyol comprising a mixture of glycerides, with the polyol having a monoglyceride content of at least 45 wt. %.
A process of producing a controlled release fertilizer comprising the steps of:
- contacting a hydroxyl containing compound with a triglyceride and/or a diglyceride in the presence of a catalyst to provide a mixture of monoglycerides and diglycerides of any one of Formulas 1-4:
- HO—CH2—CH(OH)—CH2—X (Formula 1)
- HO—CH2—CH(X)—CH2—OH (Formula 2)
- wherein X is —O—CO—CyHz, wherein y ranges from 15-21 and z ranges from 29-41,
- HO—CH2—CH(X)—CH2—Y (Formula 3)
- X—CH2—CH(OH)—CH2—Y (Formula 4)
- wherein X and Y are the same or different and where X or Y are —O—CO—CnHm and wherein n ranges from 15-21 and m ranges from 29-41, X—CH2—CH(OH)—CH2OH;
- contacting the mixture of monoglycerides and diglycerides with a cross-linking moiety comprising sulfur, oxygen, and/or a peroxide of up to about 25 wt. % based on the weight of the mixture of monoglycerides and diglycerides to provide a cross-linked polyol;
- contacting a particulate plant nutrient with a mixture comprising the cross-linked polyol, an isocyanate, and wax to provide a coated particulate plant nutrient;
- and
- curing the coated particulate plant nutrient to provide the controlled release fertilizer.
Dependencies are inferred from the claim text.