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    • 8. 发明申请
    • Development of radiation-sensitive elements
    • 辐射敏感元件的开发
    • US20060154187A1
    • 2006-07-13
    • US11304075
    • 2005-12-15
    • John WilsonJohn ClaytonJeffrey CookeJacqueline RicafrenteYanguo YangJoyce Lukas
    • John WilsonJohn ClaytonJeffrey CookeJacqueline RicafrenteYanguo YangJoyce Lukas
    • G03C5/00
    • G03F7/322
    • An aqueous alkaline developer for use with an imaged lithographic printing precursor comprises an aqueous alkaline medium, sodium metasilicate, a steric or electrosteric stabilizer, and a rinse aid or a phase stabilizer. It is suited for developing a lithographic printing precursor comprising, on a substrate, a coated and dried layer of a radiation-sensitive composition comprising one or more acetal resins. The developer may further contain a moderator, a dispersing agent capable of solvating a hydrophobic image colorant, and a wetting agent. The acetal resin of the precursor may be derived from polyvinyl alcohol by condensation with aldehydes. The imageable element is imageable by radiation, preferably infrared radiation, and provides good sensitivity for use in lithographic applications, such as conventional imaging systems, computer-to-plate systems or other direct imaging elements and applications when treated with the developer. The invention also provides a positive-working lithographic printing master comprising a precursor as aforesaid, imaged and developed with the developer. The invention further provides a method for cleaning the processor equipment in which the imaged lithographic printing precursor has been developed, comprising treating the deposit with an acid to yield liberated image colorant and treating the liberated image colorant with a cleaning composition.
    • 用于成像的平版印刷前体的含水碱性显影剂包括碱性水溶液,偏硅酸钠,空间或电气稳定剂,以及漂洗助剂或相稳定剂。 它适用于开发平版印刷前体,其在基材上包含包含一种或多种缩醛树脂的辐射敏感组合物的经涂层和干燥层。 显影剂还可以含有调节剂,能够溶剂化疏水性图像着色剂的分散剂和润湿剂。 前体的缩醛树脂可以通过与醛缩合而衍生自聚乙烯醇。 可成像元件可通过辐射,优选红外辐射成像,并且对于在用显影剂处理时的光刻应用(例如常规成像系统,计算机对板系统或其它直接成像元件和应用)中提供良好的灵敏度。 本发明还提供了一种正性平版印刷母版,其包含前述的前体,用显影剂成像和显影。 本发明还提供了一种用于清洁处理器设备的方法,其中成像的平版印刷前体已被开发,包括用酸处理沉积物以产生释放的图像着色剂并用清洁组合物处理释放的图像着色剂。