초록 ▼

A method and composition for dispensing through a slow release floating polymer a pesticide for destroying aqueous pests, especially mosquito larva. The polymer matrix which has a specific gravity of less than 1.0 so that it floats, may be shaped into any geometric design such as a thin strip or tap

A method and composition for dispensing through a slow release floating polymer a pesticide for destroying aqueous pests, especially mosquito larva. The polymer matrix which has a specific gravity of less than 1.0 so that it floats, may be shaped into any geometric design such as a thin strip or tape and is anchored by an attached weight having a specific gravity greater than 1.0. The floating polymer assures slow release of the insecticide in that it is not covered by debris or silt as would occur with a sinking polymer matrix. The floating matrix can be utilized wherever desirable in slow turnover or stagnant waters, such as in lakes, ponds, swamps, storm sewer catch basins and portable water containers such as rain barrels, and the like. The floating member generally can contain any pesticide for the elimination of any specific pests or insects. The polymer of the matrix is a copolymer of ethylene-vinyl acetate and/or an ethylene-propylene copolymer. Moreover, a coleachant or a porosigen may be utilized to assure continued release over a long period of time such as for one to three years.

대표청구항 ▼

A floating pesticide dispenser, comprising: a floating thermosplastic dispenser containing a pesticide and having a density less than 1.0 grams per cc, said thermoplastic dispenser containing a thermoplastic copolymer selected from the group consisting of a copolymer of ethylene-vinyl acetate, a cop

A floating pesticide dispenser, comprising: a floating thermosplastic dispenser containing a pesticide and having a density less than 1.0 grams per cc, said thermoplastic dispenser containing a thermoplastic copolymer selected from the group consisting of a copolymer of ethylene-vinyl acetate, a copolymer of ethylene-propylene, and combinations thereof, said ethylene-vinyl acetate copolymer having from about 60 to about 95 percent by weight of ethylene and a weight average molecular weight of from about 40,000 to about 400,000, said ethylene-propylene copolymer having from about 30 percent to about 80 percent by weight of ethylene, and a weight average molecular weight of about 50,000 to about 250,000, said dispenser containing a pesticide for use in an aqueous environment for destroying aquatic pests, said pesticide may be a compound having the formula R3SnX where R3 is selected from the group consisting of an alkyl group having from 1 to 8 carbon atoms, an aryl group, and a substituted aryl group wherein said substituted group is an alkyl or an ester containing from 1 to 6 carbon atoms; X is selected from the group consisting of a halogen, an oxide, an alkoxy OR1 where R1 is an alkyl having from 1 to 12 carbon atoms, or an [Figure] group where R″is an alkyl having from 1 to 12 carbon atoms, the amount of said pesticide ranging from about 2 parts to about 80 parts by weight per 100 parts of said thermoplastic copolymer when the pesticide is not of formula R3SnX and when said pesticide is said R3SnX compound, the amount of said R3SnX pesticide ranging from about 25 parts to about 75 parts per 100 parts of said copolymer, and a weighted anchor, said weighted anchor connected to said dispenser and said pesticide being slowly released from said thermoplastic dispenser.