| 摘要 |
An object of the present invention is to provide a lithographic printing plate precursor which exhibits satisfactory developability using a developing solution having the pH of 12 or lower and has long print run length and satisfactory scratch resistance, and also exhibits improved ink receptivity. Disclosed is a positive-working lithographic printing plate precursor comprising a substrate having thereon an image forming layer comprising a water-insoluble and alkali-soluble or alkali-dispersible resin in an aqueous alkali solution,
wherein the image forming layer comprises at least a lower layer and an upper layer, and
the resin of one of the lower layer and the upper layer, or both of the lower layer and the upper layer comprises a polyurethane including a unit comprising a substituent having an acidic hydrogen atom and a unit represented by the following general formula (I):
wherein
R f is an alkyl or polyether group in which at least 50% of hydrogen atoms have been fluorinated,
R 1 is a hydrogen atom, or a substituted or non-substituted alkyl group,
m is 0 or 1 to 10, n is 1 to 30, and
x is 1 to 4. |
