Method for the additive production of relief printing plates

A process for the production of relief printing plates, where a carrier with a polymeric substrate layer is provided and a relief is formed layer-by-layer on a surface of the substrate layer, where the relief is formed by means of the following steps in the specific order of a), b) and then c):

• a) single or multiple application of a liquid comprising a reactive monomer with high diffusion velocity in the polymeric substrate layer is used first, and subsequently a different reactive monomer with a lower diffusion velocity in the polymeric substrate layer is used in a subsequent layer(s) wherein the reactive monomer is then changed to one with lower diffusion velocity for the more externally situated layers,
• b) diffusion of the reactive monomer into the polymeric substrate layer for a prescribed exposure time and
• c) hardening of the relief,
• where in step a) the liquid is applied in accordance with an image to the surface and where, after the prescribed exposure time of step b), any liquid that remains on the surface, having not diffused into the material, is removed from the surface before step c), and in step c) the relief that is hardened comprises the polymer of the substrate layer and reactive monomer that has diffused into the material, and
• wherein the proportion of the at least one reactive monomer present in the liquid is from 80% by weight to 100% by weight.

A process for the production of relief printing plates, where a carrier with a polymeric substrate layer is provided and a relief is formed layer-by-layer on a surface of the

• substrate layer, where the relief is formed by means of the following steps in the specific order of a), b) and then c):
• a) single or multiple application of a liquid comprising a reactive monomer with high diffusion velocity in the polymeric substrate layer is used first, and subsequently a different reactive monomer with a lower diffusion velocity in the polymeric substrate layer is used in a subsequent layer(s) wherein the reactive monomer is then changed to one with lower diffusion velocity for the more externally situated layers,
• b) diffusion of the reactive monomer into the polymeric substrate layer for a prescribed exposure time and
• c) hardening of the relief,
• where in step a) the liquid is applied in accordance with an image to the surface and where, after the prescribed exposure time of step b), any liquid that remains on the surface, having not diffused into the material, is removed from the surface before step c), and in step c) the relief that is hardened comprises the polymer of the substrate layer and reactive monomer that has diffused into the material, and wherein the polymer of the polymeric substrate layer is selected from polyvinyl alcohol, partially or highly hydrolyzed polyvinyl acetates and polyamide.