Lithographic printing plate precursors and methods of use

An IR sensitive lithographic printing plate precursor provides a stable printed output image using a unique IR radiation sensitive composition in an infrared radiation sensitive image recording layer. The IR radiation sensitive composition comprises: (1) a free radical initiator composition comprising a borate compound; (2) a radically polymerizable composition; (3) an acid-sensitive color-changing compound represented by formula (I) as identified herein; (4) an infrared absorbent material; and (5) a color changing compound of formula (III) or formula (IV) as identified herein. After IR imaging, the exposed precursor exhibits a desirable printed output image, in particular in the 600-700 nm region of the electromagnetic spectrum, and in particular for observation using an electronic sensing device. The imaged precursor may be developed off-machine or on-machine. IR敏感平版印刷版前体使用红外辐射敏感图像记录层中的独特IR辐射敏感组合物提供稳定的印刷输出图像。该IR辐射敏感组合物包含：(1)自由基引发剂组合物，其包含硼酸盐化合物；(2)可自由基聚合组合物；(3)酸敏感变色化合物，其由本文标识的式(I)所表示；(4)红外吸收剂材料；和(5)本文标识的式(II