SEDL / STP / STP1183-EB / STP25149S

Grafted Polymers and Copolymers of Vinyl Pyrrolidone for Improved Water Dispersible Granules

Fu, E
Agricultural applications, Research and Development, International Specialty Products Inc., Wayne, NJ

Chaudhuri, RK
Agricultural applications, Research and Development, International Specialty Products Inc., Wayne, NJ

Narayanan, KS
Agricultural applications, Research and Development, International Specialty Products Inc., Wayne, NJ

Pages: 9    Published: Jan 1993

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Abstract

Polyvinylpyrrolidone (PVP), especially PVP K-30 (Agrimer^™2 30), has been widely used in many different delivery systems. It can act as a solubilizing agent by complexing with many active ingredients, dispersing and suspending agent, viscosity enhancer, granule and tablet binder, and coating agent. In this paper, we describe its use and performance, along with vinylpyrrolidone-vinylacetate copolymer (Agrimer^™ VA 6) and PVP grafted with butene (Agrimer^™ AL 10), as a binder for water dispersible granules. The PVP-type polymers, at the 3% level, were used in a prototype atrazine 90DF formulation. The resulting granules, prepared by pan granulation, were found to have improved performance compared to granules made with conventional lignosulfonate binder. Less moisture was required to produce good granules, and granule conversion was increased. Slight to moderate improvements in dispersion properties were also obtained with Agrimer^™ polymers, and a marked reduction in foam generation was obtained with Agrimer^™ AL 10. The results also indicate possible synergistic effects for a mixture of Agrimer^™ AL 10 and Agrimer^™ VA 6 when used in combination.