Patent ID: 6613403
Filing Date: 2003-09-02
Classification: B41M,B44C,B44F,C08K,C09D,Y10S,Y10T

Abstract:
A printing ink comprising at least one resinous binder, at least one near infrared fluorescent (NIRF) compound, a U.V. absorbing pigment or compound, and optionally a solvent or aqueous based solventwherein said NIRF compound emits radiation at wavelengths in the range of 650 nm to 2,500 nm and the amount of NIRF compound is sufficient to form coatings, marks and images which can be sensed by a photon detector operating in the near infrared region of 650 nm to 2,500 nm, and said U.V. absorbing pigment or compound does not reduce the emission of radiation at wavelengths in the range of from 650 nm to 2,500 nm by the coatings, marks and images formed containing said NIRF compound.