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US 5,474,971 AGranted
Water-dispersible granular agricultural compositions made by heat extrusion
AssigneeE. I. Du Pont de Nemours and Company
InventorLionel S. Sandell
Life of this patent
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Abstract
Rapidly disintegrating water-soluble or water-dispersible granular compositions are made by extruding a premix through a die or screen at elevated temperature. The extruded composition is chopped or milled to form a granular product. The compositions contain one or more water-soluble ingredients which soften or melt at elevated temperatures. No water is added in the process thereby eliminating the need for drying.
Claims10
Water-dispersible granular compositions made by extruding at elevated temperature a dry premix comprising by weight based on the total weight of the composition:
- 1) 0.01-90% of one or more active ingredients which are stable at the extrusion temperature;
- 2) 1-60% of one or more water-soluble diluents;
- 3) an effective amount of one or more water-soluble heat activated binders that melt at temperatures between 40.degree.-120.degree. C.;
- and
- 4) two or more additives selected from the group consisting of:
- a) up to 10% anti caking agent(s);
- b) up to 10% chemical stabilizer(s);
- c) up to 20% gas generators;
- d) 0.1-10% disintegrant(s);
- e) 0.1-20% dispersant(s);
- f) up to 5% wetting agent(s);
- and
- g) up to 80% inert filler(s);
- and the sum of all the ingredients in a composition is 100%.
11 more elements
Dependencies are inferred from the claim text.