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Multilayer Structure for Electro-Erosion Printing Media

IP.com Disclosure Number: IPCOM000042974D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bradshaw, RL: AUTHOR [+4]

Abstract

A three-layer sandwich structure for offset masters prepared by electro-erosion printing can comprise a polymer film base with an intermediate elastomeric layer of a soft polyurethane and a top layer of a polycarbonate. A metallization layer is deposited over the polycarbonate layer. The structure acts as a "low-pass filter" which permits only long wavelength deformations needed to comply with the styli, but not short wavelength deformations which could rupture the metal bonding to the top layer. An electro-erosion head containing a multiplicity of styli requires a medium having a certain range in its elasticity modulus. The modulus must be low enough to permit compliance of the styli, and yet cannot be of a range such that very large local strains cause a failure of the adhesion of the overlying metal layer.

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Multilayer Structure for Electro-Erosion Printing Media

A three-layer sandwich structure for offset masters prepared by electro-erosion printing can comprise a polymer film base with an intermediate elastomeric layer of a soft polyurethane and a top layer of a polycarbonate. A metallization layer is deposited over the polycarbonate layer. The structure acts as a "low-pass filter" which permits only long wavelength deformations needed to comply with the styli, but not short wavelength deformations which could rupture the metal bonding to the top layer. An electro-erosion head containing a multiplicity of styli requires a medium having a certain range in its elasticity modulus. The modulus must be low enough to permit compliance of the styli, and yet cannot be of a range such that very large local strains cause a failure of the adhesion of the overlying metal layer. To achieve the correct modulus while maintaining wide latitudes in fabrication requirements, a multilayer structure is preferred on a flexible, plastic substrate of a polyethylene terephthalate film. A water-based polyurethane primer is applied to the flexible substrate. Curing of the polyurethane is effected by the addition of small amounts of a poly-functional aziridine recommended for use as a cross-linking agent and adhesion promoter. This aziridine is highly reactive with materials containing active hydrogens, especially carboxylated polymers. The primer-coated substrate is then coated with a polyc...