Laminated insecticide dispenser
Publication Date: 2002-Aug-22
The IP.com Prior Art Database
Ole Skovmand: INVENTOR [+3]
A laminated insecticide dispenser where a central layer contains an insecticide that migrates through the outer layer to the surface of the dispenser. The outer layer also comprises a UV protector which migrates to the surface in order to minimize the UV damage induced on the insecticide.
A laminated insecticide dispenser where a central layer contains an insecticide that migrates through the outer layer to the surface of the dispenser. The outer layer also comprises a UV� protector which migrates to the surface in order to minimize the UV damage induced on the insecticide.
Background of the invention
The present invention relates to a laminated insecticide dispenser, for example a three layer tarpaulin.
In order to control insects that may be harmful or otherwise undesirable to man, much attention has been directed to improvements in methods for delivering chemical pest control agents.
A special insecticide dispenser is known from US patent No. 4,693,393 disclosing a laminated dispenser with two outer wall elements enclosing an inner layer containing a pest controlling agent. The pest controlling agent is able to migrate through the outer layers for a controlled release of the agent to the surface of the dispenser. Such a dispenser may be used for example for wall paper, floor coverings or tarpaulins.
It is well known that insecticides when exposed to ultra violet (UV radiation) are degraded through the UV induced chemical reactions. The dispenser disclosed in US patent No. 4,639,393 takes into account UV protection of the pesticidal agent in the internal reservoir by incorporation of an ultra violet light screening agent in the wall portion of the dispenser.
However, the disclosure in US patent no. 4,639,393 does not take into account any protection of the pest controlling agent after migration to the outer surface of the wall element. Especially in tropic regions, UV radiation is very strong and the insecticide that has migrated to the surface of the laminate may disintegrate at a rate so high that no efficient insecticidal effect may be achieved. Therefore, the laminated dispenser disclosed in the above mentioned patent is primarily suited for indoor use or generally where high levels of UV radiation is avoided. In connection with applications where a high intensity of UV radiation is given, the insecticide release from a dispenser as disclosed in patent US 4,639,393 has to be fast such that a suitable active level of insecticide, or alternatively an insect attractant, can be maintained on the surface. However, this limits the lifetime of the dispenser, because the insecticide reservoir is emptied after relatively short time, for example a few weeks.
It is the purpose of the invention to improve existing dispensers such that they are more suitable for application in outdoor environments where the dispenser is exposed to primarily high level UV radiation.
Description of the Invention
This purpose is achieved with a laminated insecticide dispenser comprising a first outer solid, non porous polymeric wall element with one side facing the environment of said dispenser and constituting a first surface of the dispenser...