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Multicolor Contact Printing by Electrophoretically Attracted Inks

IP.com Disclosure Number: IPCOM000075026D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Radovsky, DA: AUTHOR

Abstract

Multicolor images are contact printed by the following method. The printing plate consists of a matrix of conductive wires 1 retained in an insulative supporting block 2. The wires are insulated from each other and have ends 4 terminating at the face 6 of the block. The face is ground flush to provide a smooth printing surface.

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Multicolor Contact Printing by Electrophoretically Attracted Inks

Multicolor images are contact printed by the following method. The printing plate consists of a matrix of conductive wires 1 retained in an insulative supporting block 2. The wires are insulated from each other and have ends 4 terminating at the face 6 of the block. The face is ground flush to provide a smooth printing surface.

The printing plate is immersed successively in several electrophoretic baths containing dispersions of differently colored pigments/dyes. With each immersion the wires are selectively energized by voltages sufficient to electrophoretically adhere the dispersed bath solids to the wire ends 4, in a selective image pattern. Upon removing the plate from each bath the plate is rinsed in running tap water to remove excess loosely adhered solids. Following the last immersion the plate surface 6 is pressed against a paper surface to transfer a multicolor image. Experimental Ink Formulations: Blue "inks" 1) 175 cc of Ciba Epoxy Ester DP624 (CIBA Company, Inc.) 2) 1.0 cc of Unisperse Blue 4G paste BA 3153 (CIBA). Red "inks" 1) 175 cc of Ciba Epoxy Ester DP624 (CIBA). 2) 1.0 cc of Chromophtal Orange AGR Paste (CIBA). Black "inks" 1) 175 cc of Ciba Epoxy Ester DP624 (CIBA). 2) 1 cc of Chromophthal Orange ACR Paste (CIBA). 3) 8.0 cc of Unisperse Black C Paste BA 5245 (CIBA).

Conditions of electrophoretic deposition: 100 volts DC over 30-75 seconds. Deposition times can be reduced with increased volt...