| 摘要 |
<p>PURPOSE: To provide an electroerosion printing plate directly used as an offset printing master or a negative in the case of forming the offset printing master. CONSTITUTION: Improved electroerosion recording media can be prepared by utilizing, on top of a polyester, paper, or metal substrate, a polyvinylbutyral polymer cross-linked with a mixed phenol-tert-butylphenol formaldehyde cross- linking agent as a base layer, and an erodible metallic layer sufficiently thin to be erodible in response to current pulses delivered by a sylus of an electroerosion printer. In a preferred embodiment, the polymeric layer further contains silica. The recording medium may also be top coated with a lubricating agent. The formulation provides excellent adhesion of the conductive layer, and allows the thickness of the aluminum to be increased up to 75%, resulting in an optical density (with aluminum as the metallic layer) of up to 3.5.</p> |
