Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1994-05-19
1996-09-10
Berman, Susan W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 65, 528 66, 522 75, 522 81, 522 97, 522 96, 525920, 4302841, 4302861, 430306, C08G 1848, C08G 1812, C08G 1848, C08G 1867
Patent
active
055547125
ABSTRACT:
A photopolymer useful in preparing water-developable, solid printing plates is prepared by preparing a urethane prepolymer by reacting polyoxyalkylene 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.
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Ebner Cynthia L.
Huynh-Tran Truc-Chi T.
Kumpfmiller Ronald J.
Berman Susan W.
W.R. Grace & Co.-Conn.
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