Patent ID: 7192603
Filing Date: 2007-03-20
Classification: A01N,Y10S

Abstract:
1. Sustained-release microcapsule for long-term pest control made by the process of: dissolving an active pest-control ingredient comprising at least one pheromone with an inactive, biodegradable, and non-toxic lipid diluent to form a mixture; entrapping said active ingredient inside said diluent; microencapsulating said mixture in order to form a plurality of microcapsules consisting essentially of a capsule core and capsule shell; and providing resistant paths for mass transfer of said active ingredient to at least one of said capsule core and said capsule shell, wherein said mass transfer resistance depends on the temperature of the surrounding medium; and wherein said microencapsulating further comprises: manipulating at least one of amount of said diluent, percentage of said diluent, distribution pattern of said diluent, method of entrapping said active ingredient by said diluent, physical properties of said diluent comprising melting point thereof, and temperature of the surrounding medium, to thereby vary said mass transfer resistance to said active ingredient through said capsule core; and/or manipulating at least one of pore size, pore length, pore density, pore tortuosity, pattern of pore distribution, physical properties of said capsule shell comprising melting point thereof, and temperature of the surrounding medium, to thereby vary said mass transfer resistance to said active ingredient through said capsule shell.