×

Method for the production of thermally cross-linked laser engravable flexographic elements

  • US 6,794,115 B2
  • Filed: 07/29/2003
  • Issued: 09/21/2004
  • Est. Priority Date: 01/08/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A process for the production of a laser-engravable flexographic printing element comprising a thermally crosslinked, elastomeric, laser-engravable, relief-forming layer E, having the following steps:

  • (i) production of a multilayer composite at least comprising a two-layer composite consisting of a depot layer D and an uncrosslinked precursor layer V for the relief-forming layer E which is directly adjacent to the depot layer D, and optionally further layers, support foils or films and/or protective films, where the precursor layer V comprises (a) at least one elastomeric binder, (b) at least one ethylenically unsaturated monomer, (c) optionally an absorber for laser radiation, and (d) optionally further additives, where the depot layer D comprises (e) at least one elastomeric binder, (f) at least one thermally decomposing polymerization initiator, (g) optionally an absorber for laser radiation, and (h) optionally further additives, (ii) allowing the thermally decomposing polymerization initiators to diffuse out of the depot layer D into the precursor layer V, (iii) optionally removal of the depot layer D, and (iv) thermal crosslinking of the precursor layer V to give the crosslinked, elastomeric, laser-engravable, relief-forming layer E.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×