TH129151A - Use of moisture-stable yellow fluorescent dyes in safety applications. - Google Patents

Abstract

DC60 (17/04/56) Yellow and green fluorescent compounds are listed here that can be incorporated into carriers (e.g., inks) and applied (e.g., printed) in the form of security features on substrates (e.g., documents). Compounds can be selected based on their resistance to moisture, and should exhibit high initial fluorescence intensity, relatively high fluorescence intensity, and low relative intensity loss after extended exposure to moisture. Yellow and green fluorescent compounds are listed here that can be incorporated into carriers (e.g., inks) and applied (e.g., printed) in the form of security features on substrates (e.g., documents). Compounds can be selected based on their resistance to moisture, and should exhibit high initial fluorescence intensity, relatively high fluorescence intensity, and low relative intensity loss after extended exposure to moisture.

Claims (1)

: DC60 (17/04/56) Yellow and green fluorescent compounds are provided herein which can be incorporated into a carrier (e.g., ink) and applied (e.g., printed) in a security feature on a substrate (e.g., document). The compounds can be selected based on their resistance to moisture, and should exhibit high initial fluorescence intensity, and relatively high fluorescence intensity and low relative intensity loss after extended exposure to moisture. Yellow and green fluorescent compounds are provided herein which can be incorporated into a carrier (e.g., ink) and applied (e.g., printed) in a security feature on a substrate (e.g., document). The compounds can be selected based on their resistance to moisture, and should exhibit high initial fluorescence intensity, and relatively high fluorescence intensity and low relative intensity loss after extended exposure to moisture. Claim (one) which appears on the advertisement page: 1. A method for producing a security feature printed on a document, comprising: selecting a fluorescent dye that has a fluorescent intensity loss of less than approximately 40 percent of its initial intensity when excited by light of a wavelength of approximately 365 nm, after the fluorescent dye has been exposed to a temperature of at least 85 °C and 100% relative humidity for a period of at least approximately 40 h;