Quick drying polymeric coating
AssigneeSpecialty Feritlizer Products, LLC
InventorsJohn Larry Sanders, Grigory Mazo, Jacob Mazo
Life of this patent
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Abstract
Improved agriculturally useful products are provided, including solid materials such as nitrogenous fertilizers (e.g., urea), together with a polycarboxylated polymer selected from the group consisting of a salts of copolymers containing individual quantities of maleic and itaconic moieties. The polymer composition also includes from about 10-60% by weight of an organic drying agent such as a lower alcohol which enhances the quick drying properties thereof. The compositions may also include an amount of boron, and bimodal vinylic polymer made up of quantities of high and low molecular weight (MW) vinylic polymers such as PVA.
Claims34
A fertilizer product comprising:
- a quantity of a solid fertilizer;
- and
- a polymer-containing composition applied to said fertilizer,
- said polymer-containing composition including a substantially water soluble copolymer containing individual quantities of maleic and itaconic moieties, water, an organic compound drying agent,
- said composition further including from about 0.5-5% by weight boron as boric acid, an amount of bimodal vinyl polymer therein, said bimodal vinyl polymer including individual high and low molecular weight vinyl polymer fractions, said bimodal vinyl polymer comprising low MW PVA having a weight averaged molecular weight Mw of from about 13,000-23,000, and high MW PVA having a weight averaged molecular weight Mw of about 145,000 and above, said low MW PVA being present in an amount greater than said high MW PVA,
- said fertilizer product prepared by applying said polymer-containing composition to said solid fertilizer, and allowing said drying agent and a substantial part of the water present in the applied composition to evaporate, so that the fertilizer product does not contain said drying agent or water to any substantial degree.
A method of forming a fertilizer composition, comprising the steps of:
- applying a polymer-containing composition onto a quantity of a solid fertilizer, said polymer-containing composition including a substantially water soluble copolymer containing individual quantities of maleic and itaconic moieties, water, and an organic compound drying agent,
- said composition further including from about 0.5-5% by weight boron as boric acid, an amount of bimodal vinyl polymer therein, said bimodal vinyl polymer including individual high and low molecular weight vinyl polymer fractions, said bimodal vinyl polymer comprising low MW PVA having a weight averaged molecular weight Mw of from about 13,000-23,000, and high MW PVA having a weight averaged molecular weight Mw of about 145,000 and above, said low MW PVA being present in an amount greater than said high MW PVA;
- and
- allowing said drying agent and a substantial part of the water present in said polymer-containing composition to evaporate, so that the fertilizer composition does not contain said drying agent or water to any substantial degree.
Dependencies are inferred from the claim text.