Thermal transfer ribbon with self generating silicone resin backcoat
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United States of America Patent
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Jun 20, 2000
Issued Date -
N/A
app pub date -
Jun 22, 1998
filing date -
Jun 10, 1996
priority date (Note) -
Expired
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Abstract
Thermal transfer ribbons derived from aqueous-based coating formulations which do not require the application of a separate backcoat to the substrate. Backcoatings are self-generated on the untreated side of the substrate when the untreated side of the substrate contacts a remote portion of the top surface of the thermal transfer layer. The thermal transfer ribbons which self-generate backcoats comprise a flexible substrate and a thermal transfer layer which contains a water-soluble silicone block copolymer with blocks of silicone resin and water-soluble polymer. The water-soluble silicone block copolymer migrates to the top surface of the thermal transfer layer and generates a backcoat on the opposite surface of the substrate when the ribbon is wound such that the untreated surface of the substrate contacts a remote portion of the top surface of the thermal transfer layer. Embodiments which incorporate both a water soluble silicone block copolymer and hydrophobic siloxane liquid or gum in the thermal transfer layer, for migration, are included.
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