PLANOGRAPHIC PRINTING PLATE MATERIAL

Abstract

An objective is to provide a planographic printing plate material exhibiting excellent developability, printing durability, together with excellent oxygen-shielding layer adhesion and moisture dependence after exposure. Disclosed is a planographic printing plate material possessing a support provided thereon, a photosensitive layer, wherein the photosensitive layer comprises (A) at least two binder polymers comprising different glass transition points (Tg) from each other, (B) a polymerizable ethylenic double bond-containing compound, and (C) a photopolymerization initiator.

Description

Claims

1. A planographic printing plate material comprising a support provided thereon, a photosensitive layer, wherein the photosensitive layer comprises (A) at least two binder polymers comprising different glass transition points (Tg) from each other; (B) a polymerizable ethylenic double bond-containing compound; and (C) a photopolymerization initiator.

2. The at least two binder polymers of claim 1, wherein a smallest Tg difference among Tg differences of any two binder polymers is at least 10° C.

3. The at least two binder polymers of claim 2, wherein the smallest Tg difference is at least 20° C.

4. The at least two binder polymers of claim 1, wherein at least one binder polymer has a Tg of at least 110° C.

5. The at least two binder polymers of claim 1, wherein at least one binder polymer has a Tg of at most 90° C.

6. The planographic printing plate material of claim 1, wherein the ethylenic double bond-containing compound comprises a multifunctional acrylate comprising an amide bond and a tertiary amino group in a molecule.