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Ink Formula for Thermal Ribbon

IP.com Disclosure Number: IPCOM000051131D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 14K

Publishing Venue

IBM

Related People

Graham, AE: AUTHOR

Abstract

An intimate mixture of sucrose acetate isobutyrate, ethyl cellulose, carbon black, and stearic acid provides a thermal ink which is applied to a thermal ribbon as a melted liquid.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 56% of the total text.

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Ink Formula for Thermal Ribbon

An intimate mixture of sucrose acetate isobutyrate, ethyl cellulose, carbon black, and stearic acid provides a thermal ink which is applied to a thermal ribbon as a melted liquid.

In a thermal ribbon, heat to melt ink is generated in a controlled manner, as by passing current from selected point electrodes through a resistive layer to an intermediate layer of aluminum and then to a broad area electrode. The ink is on the side of the ribbon near the paper. It is melted in the pattern of the point electrodes which are driven and flows on to the paper in that pattern.

Such inks desirably satisfy the following minimum criteria for inks for the thermal ribbon Involved: (1) solid at room temperature; (2) strong as solid (optional depending upon use in given reinking system); (3) homogeneous as solid; (4) reproducible melting point (in the general range of 70 degrees C to 100 degrees C); (5) rapidly produced low viscosity near melt temperature (in the general range between 1 and 10/3/ cps); (6) homogeneous as a liquid; (7) feeds well and rapidly through applicator (optional depending upon inking or reinking conditions and type of applicator); (8) uniformly coats metal in thin film (about 0.2 mil or more); (9) releases from metal or other substrate during printing; (10) ]et black with high optical density; and (11) smudge-resistant as printed characters.

The following ink formula functions as an interactive combination to achieve a number of objectives. Component Pbw Density Volume Sucrose Acetate Isobutyrate 9.3 1.15 8.1 Ethyl Cellulose (Hercules 1.2 1.14 1.1 Inc. N-10)

Carbon Black 1.3 1.8 0.7 Stearic Acid 6.0 0.839 7.2.

In this formula the sucrose acetate isobutyrate appears to make the following contributions: (1) provides abrupt change in viscosity with temperature; (2) provides stability during heat exposure; (3) no vaporization during heating; (4) at melt temperature, high solvent action on ethyl cellulose, enhancing compatibility and functionality of the ink; (5) very high gloss and good adhesion to paper; (6) suitable to low viscosity inks; (7) compatible with liquid stearic acid; and, (8) provides relatively low...