Method and composition for the long term controlled release of a

Details Method and composition for the long term controlled release of a Method and composition for the long term controlled release of a

1978-06-19

1979-08-28

Schenkman, Leonard

Drug, bio-affecting and body treating compositions

Solid synthetic organic polymer as designated organic active...

Polymer from ethylenic monomers only

424 83, 424288, A01N 900

Patent

active

041661117

ABSTRACT:
A method and composition for destroying pest insects in their aquatic stage and other pest-life forms over a sustained period of time, by the gradual and continuous release of an organotin substance from an inert thermoplastic medium. The composition comprises an organotin of extremely low water solubility bound in an ethylene vinyl acetate copolymer, in which said organotin is insoluble and in which said organotin is uniformly dispersed with an inert coleachant of moderate to low water solubility. When this formulation is brought into contact with water, the coleachant gradually solvates into the water creating and enhancing the development of porosity within the thermoplastic phase. Said organotin agent, interspersed within the thermoplastic matrix, contacts the entering water and egresses as molecular aggregates being washed through the pore system and into the external watery medium. Such aggregates being toxic to mosquito larva, other insects and various other pesteferous life forms, upon continuous exposure, leads to a condition of terminal chronic intoxication.

REFERENCES:
patent: 3234032 (1966-02-01), Leebrick et al.
patent: 3236793 (1966-02-01), Robins et al.
patent: 3417181 (1968-12-01), Cardarelli
patent: 3590119 (1971-06-01), Cardarelli et al.
patent: 3639583 (1972-02-01), Cardarelli et al.
patent: 4012347 (1977-03-01), Ohlitz et al.
Chemical Abstracts 75:97577c (1971).

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