Abstract: A photopolymerisable relief precursor includes a dimensionally stable carrier, and a photopolymerisable relief-forming layer at least containing a crosslinkable elastomeric binder, an ethylenically unsaturated monomer, a migration-capable, surface-active additive, a photoinitiator activatable with UVA light and a photoinitiator activatable with UVC light. A method for producing a relief structure.

Abstract: A method of thermal development of flexographic printing elements, having steps of: fixing a relief precursor a movable support; repeatedly moving the support in a multitude of movement cycles; heating the relief precursor to a temperature sufficient to cause the uncured portions of the photopolymer layer to soften or liquefy; contacting with a development medium; Single movement cycles are carried out with different heating powers and different contacting with the developing medium such that one may improve the registration accuracy of the printing element, ease removal of functional layers, smoothen the relief plate precursor surface, and address heat build-up problem.

Abstract: A photopolymerisable relief precursor includes a dimensionally stable carrier, and a photopolymerisable relief-forming layer at least containing a crosslinkable elastomeric binder, an ethylenically unsaturated monomer, a migration-capable, surface-active additive, a photoinitiator activatable with UVA light and a photoinitiator activatable with UVC light. A method for producing a relief structure.

Abstract: A method for thermally developing a relief precursor comprising a supporting layer and photopolymer layer having cured and uncured portions comprising the steps: (a) fixing the relief precursor with the supporting layer adjacent to a movable support; (b) repeatedly moving the support with the relief precursor fixed thereon in a multitude of movement cycles; (c) heating the relief precursor to a temperature sufficient to cause the uncured portions of the photopolymer layer to soften or liquefy; (d) contacting the relief precursor with a development medium to allow the liquefied material of the uncured portions to be adhered to and removed by the development medium; wherein the heating and contacting is carried out in cycles A, B, C or D each corresponding to a single movement cycle such that (i) in a cycle A, the relief precursor is heated with higher heating power and not contacted the relief precursor with the development medium; (ii) in a cycle B, the relief precursor is heated with higher heating power