Thermographic imaging element
First Claim
1. A thermographic substrate assembly comprised of a colorant, a flexible substrate, a thermosensitive layer comprised of a binder, a multiplicity of hollow sphere organic pigments, and a thermal solvent, wherein said thermographic substrate assembly also comprises a barrier layer, wherein said thermosensitive layer is disposed on said colorant, wherein said barrier layer is disposed on said thermosensitive layer, and wherein said barrier layer is comprised of a polymeric binder having a coating weight of from about 0.1 grams per square meter to about 4 grams per square meter.
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Abstract
A thermographic substrate assembly comprised of a colorant and a flexible substrate. This assembly also contains a thermosensitive layer, and the thermosensitive layer contains a binder, a multiplicity of hollow sphere organic pigments, and a thermal solvent.
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Citations
34 Claims
- 1. A thermographic substrate assembly comprised of a colorant, a flexible substrate, a thermosensitive layer comprised of a binder, a multiplicity of hollow sphere organic pigments, and a thermal solvent, wherein said thermographic substrate assembly also comprises a barrier layer, wherein said thermosensitive layer is disposed on said colorant, wherein said barrier layer is disposed on said thermosensitive layer, and wherein said barrier layer is comprised of a polymeric binder having a coating weight of from about 0.1 grams per square meter to about 4 grams per square meter.
- 3. A process for producing visible printing on a thermographic imaging substrate assembly, wherein said thermographic imaging substrate assembly is comprised of a colorant, a flexible substrate, and a thermosensitive layer, wherein said thermosensitive layer is comprised of a binder, a multiplicity of hollow sphere organic pigments, and a thermal solvent, wherein said thermosensitive layer is disposed on said colorant, and wherein said thermal solvent has a Hildebrand solubility parameter from about 16 megapascals1/2 to about 28 square megapascals1/2, comprising the steps of applying heat to a selected portion of said thermosensitive layer and inducing said selected portion of said thermosensitive layer to change from opaque to translucent, whereby a contrasting visual mark is produced.
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7. A thermographic imaging substrate assembly that is comprised of a colorant, a flexible substrate, an opaque thermosensitive layer, and a heat resistant topcoating, wherein:
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(a) said thermographic imaging substrate assembly has an unimaged color saturation of less than 0.5 Rd, (b) said heat resistant top-coating is disposed above said opaque thermosensitive layer; (c) said opaque thermosensitive layer is comprised of a binder, a multiplicity of hollow sphere organic pigments, and a thermal solvent, (d) said hollow sphere organic pigments have an average particle size of from about 0.1 micron to about 2.0 microns, (e) said thermal solvent has a Hildebrand solubility parameter of from about 16 megapascals1/2 to about 28 square megapascals1/2, (f) said thermosensitive layer is disposed on said colorant, and (g) when heat is applied to a selected portion of said thermosensitive layer, said selected portion changes from opaque to translucent, thereby producing a contrasting visual mark. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification