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EP0434420A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Thermal transfer ribbon

Assignee: NCR International Inc
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Filing: 1990-12-20
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Granted: —
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Expires: 2010-12-20
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Abstract

Abstract A thermal transfer ribbon (20) has a substrate (22), an undercoating (24) which contains thermal reactive materials and leuco dyes, and a thermal transfer coating (34) applied on the undercoating and which contains a mixture of a wax emulsion and a sensible material, the undercoating (24) assisting the transfer of colour images of an improved intensity and sharpness to a receiving medium upon the application of heat to the ribbon (20). The invention also covers incorporation of the leuco dye and a reactant in the coating (34) to intensify the transferred image, with or without the presence of sensible materials such as iron oxide or fluroescent dye, to improve the sharpness and the scratch and smear resistance of the transferred image. An alternative to the two coatings is a single coating (44) which includes pigments with sensing characteristics, thermal reactive material, and transfer agents to obtain an improved intensity image.

Inventors

  • 👤 Shashi G. Talvalkar

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 21:43
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38235; B41M5/38285; B41M5/392

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 62 words
A thermal transfer ribbon (20) including a substrate (22) and a transfer composition (24, 34, 44) on said substrate including a sensible material (36, 56) and heat responsive material for transferring said sensible material on to a receiving medium, characterized in that said transfer composition additionally includes a leuco dye and a phenolic resin which are thermally reactive for generating a colour.
Claim 2
Dependent Claim 62 words
A thermal transfer ribbon (20) including a substrate (22) and a transfer composition (24, 34, 44) on said substrate including a sensible material (36, 56) and heat responsive material for transferring said sensible material on to a receiving medium, characterized in that said transfer composition additionally includes a leuco dye and a phenolic resin which are thermally reactive for generating a colour.
Claim 3
Dependent Claim 19 words
A thermal transfer ribbon according to claim 1, characterized in that said sensible material (36, 56) comprises magnetic particles.
Claim 4
Dependent Claim 50 words
A thermal transfer ribbon according to either claim 1 or claim 2, characterized in that said leuco dye and phenolic resin are contained in an undercoating (24) to said substrate (22), and said heat responsive material and said sensible material (36) are contained in an overcoating (34) to said undercoating.
Claim 5
Dependent Claim 28 words
A thermal transfer ribbon according to claim 3, characterized in that said undercoating (24) contains by weight, 10 to 50% phenolic resin, and 2 to 10% leuco dye.
Claim 6
Dependent Claim 26 words
A thermal transfer ribbon according to either claim 3 or 4, characterized in that said undercoating (24) further contains by weight, 5 to 50% sucrose benzoate.
Claim 7
Dependent Claim 21 words
A thermal transfer ribbon according to claim 5, characterized in that said undercoating further contains by weight, 5 to 16% latex.
Claim 8
Dependent Claim 21 words
A thermal transfer ribbon according to claim 6 characterized in that said undercoating (24) further contains by weight, 5-30% amide wax.
Claim 9
Dependent Claim 26 words
A thermal transfer ribbon according to any one of claims 3 to 7, characterized in that said overcoating (34) contains a wax mixture and metallic oxide.
Claim 10
Dependent Claim 27 words
A thermal transfer ribbon according to claim 2, characterized in that said transfer composition (44) contains by weight, 2 to 10% leuco dye and 5-25% phenolic resin.
Claim 11
Dependent Claim 23 words
A thermal transfer ribbon according to claim 9, characterized in that said transfer composition additionally contains by weight, 5 to 30% sucrose benzoate.
Claim 12
Dependent Claim 22 words
A thermal transfer ribbon according to claim 10, characterized in that said transfer composition additionally contains by weight, 5 to 15% latex.
Claim 13
Dependent Claim 21 words
A thermal transfer ribbon according to claim 11, characterized in that said transfer composition additionally contains by weight, 8-30% behenyl alcohol.

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