Patent ID: 8617793

Claim:
A waterless planographic printing plate precursor having, on a substrate, at least a photosensitive layer or heat sensitive layer and a silicone rubber layer, which is a waterless planographic printing plate precursor characterized in that a color pigment and a pigment dispersant are contained in said silicone rubber layer, wherein said pigment dispersant contains an amine-based pigment dispersant as described in formulae (3): wherein R 4 is a saturated or unsaturated hydrocarbon group, and may be linear, branched or cyclic, and may contain an aromatic ring; R 5 is a saturated or unsaturated divalent hydrocarbon group of carbon number of 3 or more, and may be linear, branched or cyclic; j is a number of repetitions and an integer of 1 or more; R 6 and R 7 are saturated or unsaturated hydrocarbon groups and may be linear, branched or cyclic, and may contain an aromatic ring; R 8 is a saturated or unsaturated hydrocarbon group of a carbon number of 1 or more and may be linear, branched or cyclic, and may contain an aromatic ring; R 9 is a saturated or unsaturated divalent hydrocarbon group of carbon number of 3 or more and may be linear, branched or cyclic; 1 is a number of repetitions and an integer of 1 or more; R 10 and R 11 are saturated or unsaturated divalent hydrocarbon groups of carbon number of 3 or more and may be linear, branched or cyclic, and both of R 10 and R 11 may be the same or different, respectively; each of m and n are a number of repetitions and an integer of 1 or more, respectively; and E and G are divalent groups expressed in any one of formulae (4), and may be the same or different, respectively: