Non-aqueous controlled release insect repellent and insecticide gels

Abstract

Controlled release insect repellent or insecticide based on a non-aqueous gel composition comprising from about 1 to about 20 weight percent of one or more diblock, triblock, radial block and/or multiblock copolymers, or a mixture thereof, based on synthetic thermoplastic rubbers. The ratio of the diblock copolymer to triblock, radial block and/or multiblock copolymer can be varied from about 0 percent to about 100 percent in either direction. The higher the tri-block percentage, the stiffer the resultant gel. The material to be gelled is a hydrocarbon which based on its physical properties plays an important role in setting the controlled release rate. The composition of the hydrocarbon can vary in carbon chain length from an average of about C-13 to about C-30 and can vary in vapor pressure from about 2.3 mm Hg at 20.degree. C. to less than about 0.1 mm Hg at 20.degree. C. The hydrocarbon range on a weight basis is from about 65 to about 95 percent of the total weight of the gelled composition. The controlled release agent or active agent may comprise from about 0.1 to about 30 percent of the gel on a weight basis.

Dependencies are inferred from the claim text.