The present invention relates to liquid formulations containing pheromones, in particular sex pheromones of insects, as an active ingredient, supported by an inert liquid material whereby a film-forming resin is formed on the surface of the liquid material when exposed to oxygen. The ...http://www.google.com.hk/patents/US5670145?utm_source=gb-gplus-share專利 US5670145 - Biologically active system for dispersion of pheromones
