Claims
- 1. Process for producing a pressure-sensitive multicolor liquid ink-releasing transfer element comprising the steps of:
- a. preparing a composition comprising a heat-activatable solid blowing agent, a dispersed granulated solid which is soluble in a volatile liquid, a synthetic thermoplastic filmforming resin and a volatile liquid solvent for said resin which is a non-solvent for said dispersed granulated solid;
- b. coating said composition as a thin layer and evaporating said solvent to form a solidified layer of said resin containing said blowing agent and dispersed granulated solid;
- c. heating said solidified layer to activate and remove said blowing agent from said layer to form a dry microporous layer of said resin containing said dispersed granulated solid;
- d. treating and dry microporous layer with a volatile liquid which is a solvent for said dispersed granulated solid but is a non-solvent for said resin, to dissolve and remove said dispersed granulated solid and form a microporous layer of said resin containing empty, interconnected pores capable of absorbing a liquid ink;
- e. impregnating one area of said microporous layer with a liquid ink having one color and comprising a non-drying oil and coloring matter; and
- f. impregnating another area of said microporous layer adjacent said one area with a liquid ink having a different color and comprising a non-drying oil and coloring matter, to provide a transfer element capable of exuding said different colored inks under the effects of imaging pressure applied to said different areas.
- 2. Process according to claim 1 in which said thin layer of resinous composition is formed on a plastic film foundation which is retained as the support of said transfer element.
- 3. Process according to claim 1 in which the resinous composition also contains a volatile liquid which is a non-solvent for the film-forming resin and is less volatile than the volatile liquid solvent, and said volatile liquid is removed from the solidified layer of step (b), after evaporation of said solvent, to form a porous solidified layer of said resin containing said blowing agent and said dispersed granulated solid, followed by steps (c) through (f).
- 4. Process according to claim 1 in which said microporous resinous layer is treated, prior to being inked, in order to provide a thin, continuous barrier strip which is not capable of absorbing liquid ink, the different-colored inks being applied to areas of the microporous layer at opposite sides of said barrier strip.
- 5. Process according to claim 4 in which said barrier strip is produced by destroying the porosity of the microporous layer in the area of the barrier strip.
- 6. Process according to claim 4 in which said barrier strip is produced by removal of the resinous layer, before or after it is rendered microporous.
- 7. Multicolor pressure-sensitive transfer element prepared according to the process of claim 1.
- 8. Transfer element according to claim 7 in which a thin, continuous barrier strip which is not capable of absorbing the liquid ink is present between said one area and said other area.
- 9. Transfer element according to claim 8 in which the barrier strip comprises a non-porous, heat-fused area of said microporous layer.
- 10. Transfer element according to claim 7 in which said liquid inks each comprise a liquid oily vehicle which is incompatible with said synthetic resin.
- 11. Transfer element according to claim 7 in which a flexible plastic film foundation is present as a support for said microporous layer.
Parent Case Info
This application is a continuation-in-part of parent application Ser. No. 213,534, filed Dec. 29, 1971 and now abandoned.
US Referenced Citations (8)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
213534 |
Dec 1971 |
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