Thermal transfer ribbon with thermal dye color palette
AssigneeNCR Corporation
InventorsFrank J. Kenny, Richard D. Puckett, Thomas C. Miller, Jr.
Life of this patent
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Abstract
There is provided by the present invention a coating formulation and thermal transfer medium and printer which provide printed images in a range of colors by employing thermal dye systems in the thermal transfer layers that form the images. The thermal dye systems contain at least two reactive dyes which react at different temperatures, an activator for the reactive dyes and optionally, a sensitizer for the reactive dyes. The use of multiple reactive dyes enables a range of colors to be produced from one thermal transfer ribbon using either a multihead thermal printer or a single head thermal printer operating at different print head energies.
Claims8
An epoxy resin obtained by using a cresol novolak resin of which the total content of 3 to 6 nucleus bodies is 67 to 90% by weight, said epoxy resin being represented by the following formula (I):
- ##STR1## (in the formula (I), each P represents a methyl group, R represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and n is a positive number of 0.1 to 20 on average), wherein the plot of melt viscosity of said epoxy resin measured at 150.degree. C. by a cone plate method (variable, y:
- unit, poise) vs. the ratio of the total weight of 3 to 6 nucleus bodies in said epoxy resin (variable, x;
- unit, % by weight) satisfies the following conditions:
- said plot is present within the area surrounded by the lines of:
- 1) y=500e.sup.-0.120x, 2) y=1000e.sup.-0.120x, 3) y=400 and 4) y=0.1, and the ratio of c/d is 1.8 or less, c (% by weight) being the amount of an epoxy resin component contained in a fraction which constitutes the highest peak obtained by gel permeation chromatography (GPC) to the total epoxy resin and d being the amount of an epoxy resin component contained in a fraction which constitutes the second highest peak to the total epoxy resin.
Dependencies are inferred from the claim text.