Gypsum-based insecticide pellets and method of manufacture

Details Gypsum-based insecticide pellets and method of manufacture Gypsum-based insecticide pellets and method of manufacture

1988-11-18

1989-10-24

Swisher, Nancy A. B.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Biocides; animal or insect repellents or attractants

424484, 424489, 428330, 428404, 428703, A01N 2500, A01N 6300, A01M 120

Patent

active

048760919

ABSTRACT:
A machine distributable gypsum-based pesticide pellet in which the gypsum is a solid formed by the bonding of plaster of paris and water which includes, prior to formation of the solid, by weight, no more than the minimum water required for substantial hydration of the plaster of paris. The pellet includes approximately five percent of a pesticide with the balance being plaster of paris. The pesticide, water and plaster of paris are generally uniformly mixed to provide a pellet which has a generally uniform release of the pesticide over its life. The pellet after setting has essentially no free water in that substantially all water is absorbed in the chemical reaction between the plaster of paris and water. The pellet has a maximum surface area of about 180 mm.sup.2, a maximum weight of about 0.3 gram, and has been compressed in the extrusion process to eliminate porosity and external and internal voids.

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