| 摘要 |
<p>The present invention features a printing article comprising an aluminum base with an aluminum oxide layer upon which a silicate interlayer has been formed. Also, a positive working coating containing unique sensitizers is coated on the silicate interlayer. The positive working coating with the unique sensitizers makes possible the use of silicate as an interlayer on an anodized aluminum substrate. The sensitizers derive their properties from functionalities that permit adhesion with the silicate interlayer, whether by reaction or complexing. The coatings containing the sensitizers provides a manufacturing advantage, in that both positive and negative lithographic plates can be fabricated from the same aluminum base, thus allowing a continuous production run without line stoppage. The positive coating is caused to bind with the silicated aluminum base. Negative working coatings of course, already possess the ability to bind with a silicated aluminum base. The silicated aluminum base provides protection for the aluminum base against the deteriorating effects of alkaline developers used to develop the positive coatings. It is possible to manufacture both types of plates in a common production run without line stoppages, as a result of having a common silicated aluminum base that accommodates both positive and negative coatings and which further protects against an alkaline development with actinic radiation of positive working plates.</p> |
