Patent ID: 6803051
Filing Date: 2004-10-12
Classification: A01N,Y10S

Abstract:
A multi-layer barrier for preventing a wood pest from accessing a wooden structure, the barrier comprising:(a) a first layer comprising a first polymer, a liquid pesticide, and a carrier, wherein said first polymer is selected from the group consisting of high density polyethylene, low density polyethylene, ethylene vinyl acetate, vinyl acetate, urethane, polyester, a thermoplastic elastomer, silicone, neoprene, polyethylene, polyurethane, polypropylene, polybutylene, epoxy polymers, polyamides, acrylate styrene-acrylonitrile, aromatic polyesters, unsaturated polyesters, polyisoprene, and combinations thereof, said first polymer forming a polymer matrix, the pesticide bound to the carrier to form a pesticide-carrier mixture, the polymer matrix being formed by mixing the first polymer and the pesticide-carrier mixture to form a mixture, melting the mixture, and solidifying the mixture to form the polymer matrix, the pesticide-carrier mixture bound within the polymer matrix, said pesticide is selected from the group consisting of isofenphos, fenvalerate, cypermethrin, permethrin, tefluthrin, lambdacyhalothrin, cyfluthrin, deltamethrin, and combinations thereof, and wherein the carrier is selected from the group consisting of carbon black, activated carbon, alumina, silicoaluminate, hydroxyapatite and combinations thereof; and (b) a second layer located adjacent the first layer, said second layer of a second polymer, said second layer being impermeable such that the pesticide is substantially not released from the barrier but it released from the barrier at a rate which is less than 0.4 &mgr;g/cm2/day such that the wood pest is prevented from breaching the barrier.