Patent ID: 6221279
Filing Date: 2001-04-24
Classification: C09D,C09K

Abstract:
A fluorescent particulate marking composition comprising:a. a crystalline thermoplastic polyester resin having residues of at least one dicarboxylic acid and having an intrinsic viscosity (IV) of less than about 0.37; andb. a near-infrared fluorescing compound having a fluorescence between about 650 nm to about 2500 nm associated with said crystalline thermoplastic polyester in copolymerized form,wherein said marking composition has a mean particle size in the range of 0.1 to about 10 microns, andsaid near-infrared fluorescing compound is present in said marking composition in an amount in the range of from about 10 ppm to 5,000 ppm and is invisible to the unaided eye.