초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A thermal transfer ribbon comprising a flexible substrate with a backcoating and a thermal transfer layer positioned on the opposite surface of said flexible substrate, said thermal transfer layer comprising a water emulsifiable or dispersible wax, a water soluble, disper

[ What is claimed is:] [1.] A thermal transfer ribbon comprising a flexible substrate with a backcoating and a thermal transfer layer positioned on the opposite surface of said flexible substrate, said thermal transfer layer comprising a water emulsifiable or dispersible wax, a water soluble, dispersible or emulsifiable binder resin, a sensible material and a water-soluble silicone block copolymer having a molecular weight and viscosity so as to flow at ambient temperature, wherein said water-soluble silicone block copolymer is present in an amount of 10 wt. % or less, based on total solids within said thermal transfer layer.