초록 ▼

A composition and method for the controlled release of compounds from a plastic dispenser, usually a thermoplastic, generally in association with a porosigen in contact with water, for example, an aquatic environment or soil moisture. Thermoplastic dispensers are generally made from a water insolubl

A composition and method for the controlled release of compounds from a plastic dispenser, usually a thermoplastic, generally in association with a porosigen in contact with water, for example, an aquatic environment or soil moisture. Thermoplastic dispensers are generally made from a water insoluble polymer such as polyethylene, polypropylene, ethylene vinyl acetate, polyamide, polystyrene, polyvinyl acetate, polyurethane, etc. Thermoset plastics, such as epoxy, are also used. The porosigen, depending upon the desired end use and release rate of a compound, can have a solubility of less than 0.1 or 0.001 grams per 100 grams of water, or up to 100 grams per 100 grams of water. The released compound, for example, a larvicide, a molluscicide, a nematicide, a trace nutrient, a plant regulant, etc., is contained in the thermoplastic dispenser. The combination of the plastic dispenser containing the porosigen and compound results in a slow release which can last for days, months, and even years, through dissolution of the porosigen and the formation of a porous network permitting water to contact the dispersed compound located in the interior portions of the dispenser.

대표청구항 ▼

A floating controlled release pesticide dispenser, comprising: a polymer, an aquatic pesticide, and a porosity inducing agent, said polymer in the form of a matrix and containing said aquatic pesticide and said porosity inducing agent, the amount of said polymer being 100 parts by weight, said polym

A floating controlled release pesticide dispenser, comprising: a polymer, an aquatic pesticide, and a porosity inducing agent, said polymer in the form of a matrix and containing said aquatic pesticide and said porosity inducing agent, the amount of said polymer being 100 parts by weight, said polymer of said matrix selected from the group consisting of a thermoplastic polymer, a thermoset polymer, and combinations thereof; said aquatic pesticide being a pesticide for destroying aquatic pests in an aqueous environment, the amount of said pesticide ranging from about 2 parts by weight to about 80 parts by weight per 100 parts of said polymer except when said pesticide is an organotin compound, the amount of said organotin compound ranging from about 25 to about 75 parts; and said aquatic pesticide slowly being released from the dispenser; said dispenser having a density of less than 1.0 grams per cc; and an anchor, said anchor having a density of greater than 1.0 grams per cc and connected to said dispenser.