Title:
ELECTROTHERMAL PRINTING INK WITH MONODISPERSED SYNTHETIC PIGMENT PARTICLES AND METHOD AND APPARATUS FOR ELECTRONIC PRINTING THEREWITH
Document Type and Number:
WIPO Patent Application WO1993009954
Kind Code:
A3
Abstract:
A printing ink comprises a clear, transparent, polymeric carrier material and uniform, colloidal size charged color particles evenly dispersed therein. The carrier and the particles are adhesively bonded to one another so as to form a matrix which can collectively respond to an externally imposed electrostatic field to promote co-movement of a "bite" of ink to an imaging medium without change of the bulk particle/carrier ratio. During the printing process, the ink is melted and exposed to electrostatically charged latent image areas on a heated image cylinder, resulting in the transfer of the ink thereto in proportion to the electrostatic field strength. The ink exhibits a relatively sharp liquid-to-solid transition, thereby enabling rapid ink solidification and complete transfer from the imaging medium to the relatively cool printing substrate. Also disclosed is a printing method and apparatus that facilitate continuous, variable and on-demand color printing in conjunction with the ink. Use of essentially monodispersed, color-coated, colloidal size, spherical particles in the ink results in excellent color purity and chromaticity range.
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Inventors:
KUEHNLE MANFRED K (US)
Application Number:
PCT/US1992/009729
Publication Date:
July 08, 1993
Filing Date:
November 12, 1992
Export Citation:
Assignee:
KUEHNLE MANFRED K (US)
International Classes:
B41C1/10; B41J2/415; C09D11/00; C09D11/02; G03G9/087; G03G9/097; G03G9/12; G03G15/05; G03G15/10; (IPC1-7): B41M/
Foreign References:
| US4877451A | 1989-10-31 | |||
| EP0295364A2 | 1988-12-21 | |||
| EP0377208A2 | 1990-07-11 |
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