Controlled-release dispenser
AssigneeBend Research, Inc.
InventorsRichard W. Baker, Yasuo Ninomiya
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Abstract
A dispenser for active ingredients is disclosed which provides zero-order rate of release of essentially all of the active ingredients. The dispenser comprises a rate-controlling membrane and a solid microporous polymeric reservoir having interconnected or continuous pores capable of retaining the active ingredient by capillary forces, the reservoir being such that the active ingredient is essentially insoluble therein.
Claims12
A controlled-release dispenser capable of dispensing essentially all of an active ingredient at a zero-order rate of release comprising a membrane controlling the rate of release of said active ingredient by diffusion through said membrane and a microporous reservoir material which is highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces.
A controlled-release dispenser capable of dispensing essentially all of an active ingredient at a zero-order rate of release comprising an active ingredient, a membrane controlling the rate of release of said active ingredient by diffusion through said membrane and a microporous reservoir material which is highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces.
A method of dispensing essentially all of an active ingredient selected from pheromones, insect attractants and insect repellants at a zero-order rate of release comprising
- loading a microporous reservoir material with said active ingredient, said microporous reservoir material being highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces, and
- releasing said active ingredient by diffusion through a rate-controlling membrane.
Dependencies are inferred from the claim text.