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Near Infrared Absorbing Ink for High Speed Code Printing

IP.com Disclosure Number: IPCOM000079787D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hancke, FS: AUTHOR

Abstract

This nonpigmented water based ink is suitable for use in high-speed nonimpact printers, such as jet printers. The ink exhibits high absorption in the near infrared region, so it is easily read by employing an infrared optical scanner.

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Near Infrared Absorbing Ink for High Speed Code Printing

This nonpigmented water based ink is suitable for use in high-speed nonimpact printers, such as jet printers. The ink exhibits high absorption in the near infrared region, so it is easily read by employing an infrared optical scanner.

The ink includes in a water soluble dye having high absorptivity in the near infrared region, approximately 0.70 mu to 1.1 mu, which is added to a water based ink vehicle.

Ink vehicles include water soluble polymers such as acrylics, alkyds, polyethylene glycols, and polyacrylamides. Also, polymer emulsions such as polyvinyl acetate, polyvinyl chloride, and acrylics are employed. A water soluble dye is naphthol green.

A range of 2.5% to 7.5% by weight of naphtol green dye and a range of 2.5% to 5% by weight of polymer such as CARBOWAX* 200 R are suitable for most applications.

The composition exhibits indefinite shelf life when stored at room temperature. However other additives, fungicides and wetting agents may be incorporated into the ink. * Trademark of Union Carbide Corporation.

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