Patent ID: 9250521
Filing Date: 2016-02-02
CPC Classification: B41C,G03F

Claim Text:
1. 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 comprising: a recurring unit comprising a substituent having an acidic hydrogen atom, which substituent is selected from the group consisting of a carboxyl group, a —SO a recurring unit represented by the following general formula: 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.