Relief precursor having low cupping and fluting

A digitally imageable, photopolymerizable relief precursor at least comprising, arranged one above another in the order stated,

• (A) a dimensionally stable carrier;
• (AH) optionally, an adhesion-promoting layer;
• (B) a relief-forming layer, at least comprising
• a crosslinkable elastomeric binder,
• a first ethylenically unsaturated monomer, and
• a photoinitiator;
• (C) at least one interlayer, at least comprising
• a first, non-radically crosslinkable elastic polymer;
• (D) a laser-ablatable mask layer, at least comprising
• a second, non-radically crosslinkable elastic polymer,
• a UVA light-absorbing material, and
• an IR light-absorbing material;
• and optionally
• (E) a removable cover layer;
• characterized in that
• the layer (C) comprises at least
• a second ethylenically unsaturated monomer, and
• in that the concentration of the first ethylenically unsaturated monomer in layer (B) and the concentration of the second ethylenically unsaturated monomer in interlayer (C) differ by not more than ±2 wt %, based in each case on all the components of the layers (B) and (C) respectively;
• and
• in that the first elastic, non-radically crosslinkable polymer has a solubility parameter of 15 to 27 (MPa)1/2 to allow the second ethylenically unsaturated monomer to be dissolved in layer (C).

A digitally imageable, photopolymerizable relief precursor at least comprising, arranged one above another in the order stated,

• (A) a dimensionally stable carrier;
• (AH) optionally, an adhesion-promoting layer;
• (B) a relief-forming layer, at least comprising
• a crosslinkable elastomeric binder,
• a first ethylenically unsaturated monomer, and
• a photoinitiator;
• (C) at least one interlayer, at least comprising
• a first, non-radically crosslinkable elastic polymer;
• (D) a laser-ablatable mask layer, at least comprising
• a second, non-radically crosslinkable elastic polymer,
• a UVA light-absorbing material, and
• an IR light-absorbing material;
• and optionally
• (E) a removable cover layer;
• characterized in that
• the layer (C) comprises at least
• a second ethylenically unsaturated monomer, and in that the concentration of the first ethylenically unsaturated monomer in layer (B) and the concentration of the ethylenically unsaturated monomer in interlayer (C) differ by not more than ±2 wt %, based in each case on all the components of the layers (B) and (C) respectively;
• and in that
• the first, non-radically crosslinkable elastic polymer is chosen from hydrolyzed polyvinyl acetates having a degree of hydrolysis of 30 to 80 mol %, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, ethylene-vinyl acetate-vinyl alcohol copolymers, cyclic acetals of polyvinyl alcohol, copolymers containing two or more different vinyl acetal units selected from vinyl formal, vinyl ethyral, vinyl propyral, and vinyl butyral units.