Thermo-transfer ribbon for luminescent letters
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United States of America Patent
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Apr 23, 2002
Grant Date -
N/A
app pub date -
Oct 9, 1998
filing date -
Aug 8, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermo-transfer ribbon with a carrier, a first thermo-transferable layer formed on one side of the carrier and a second thermo-transferable layer formed on the first thermo-transferable layer, wherein (i) the first thermo-transferable layer contains a luminescent pigment, wax(es) having a melting point of approximately 70 to 110.degree. C. and approximately 1-22% by weight of a polymer wax plasticizer having a glass temperature Tg of -30 to +70.degree. C., (ii) the second thermo-transferable layer contains a non-luminescent pigment, a wax compatible polymer binder and approximately 5 to 30% by weight of wax and/or wax-like substance, (iii) the second thermo-transferable layer has a melting enthalpy DH of approximately 10 to 80 J/g and (iv) in the remission spectrum of the non-luminescent pigment in the wave length range of the light emitted by the luminescent pigment there is a remission maximum or an ascending flank of remission. The thermo-transfer ribbon furnishes print having high optical density without adversely affecting the luminescent power of the luminescent pigment. It is particularly suitable for high speed printing with edge-type print heads.
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