C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/68 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C08G 18/48 (2006.01) C08G 18/67 (2006.01) G03F 7/027 (2006.01) G03F 7/035 (2006.01)
Patent
CA 2100279
Abstract of the Disclosure A photopolymer useful in preparing water- developable, solid printing plates is prepared by preparing a urethane prepolymer by reacting polyoxy- alkylene diols or polyester diols, or a mixture thereof, with an excess of diisocyanate, followed by chain extending the resulting prepolymer mixture with an alkyldialkanolamine, then reacting the chain- extended product with a hydroxyalkyl(meth)acrylate. The resulting photopolymer is suitably formulated with additional photoactive (meth)acrylate monomers or oligomers and photoinitiator for casting or extrusion on a substrate to form a flexographic printing plate. Following UV exposure of the plate through a negative, unexposed areas can be removed by washing with a slightly acidic aqueous medium, to give a plate with a desirable relief image. The use of the aqueous washout solution as opposed to organic solvents minimizes pollution problems.
Huynh-Tran Truc-Chi Thi
Kumpfmiller Ronald James
Gowling Lafleur Henderson Llp
Pt Sub Inc.
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