Randy Kyle Churchwell

US Patent:

20020107302, Aug 8, 2002

Filed:

Sep 7, 2001

Appl. No.:

09/949023

Inventors:

Nelson Escano - Kingsport TN, US
George Benge - Fayetteville NC, US
Randy Churchwell - Danville IL, US
Linda Adams - Kingsport TN, US

International Classification:

C09D005/00

US Classification:

523/160000, 523/161000

Abstract:

This invention pertains to aqueous-based ink formulations for inkjet printing of invisible markings on the surface of articles for identification, authentication, sorting, etc. The ink formulations contain at least one near infrared monomeric (as opposed to copolymerized) dye which has been previously dispersed or dissolved in water, glycols, aliphatic alcohols, and are useful for printing by both Continuous inkjet (CIJ) and Drop-on-demand (DOD) methods. This invention also demonstrates the enhanced ability to formulate said inkjet ink formulations when a small amount of water-dissipatible sulfopolyester/amide is added. Also, melt extrusion blending is demonstrated to be an alternative manufacturing process for premixing current Eastman ClirCode™ copolymerizable dyes with the water-dissipatible sulfopolyesters without need for more expensive polymer process manufacturing steps.