Patent ID: 7268173

Claim:
Free-radically radiation-curable, solvent-free and printable precursor of a pressure-sensitive adhesive, the precursor comprising: (i) 30-75 wt. % of one or more monofunctional oligomer compounds, wherein said monofunctional oligomer compounds are mono(meth)acrylate functional oligomer compounds at least one of said oligomer compounds comprising at least one urethane bond, (ii) 0-15 wt. % of one or more poly(meth)acrylate functional oligomer compounds, (iii) 5-45 wt. % of one or more UV-curable monomer compounds comprising one ethylenically unsaturated group, (iv) 0-5 wt. % of one or more UV-curable monomer compounds comprising two or more ethylenically unsaturated groups, and (v) an effective amount of one or more free radical photoinitiators, wherein the percentages which are percentages by weight with respect to the mass of the precursor, are selected so that the precursor has a dynamic viscosity at 20° C. and at a shear rate of 100 s −1 of between 300 to 15,000 mPa·s, and wherein the UV-curable monomers of components (iii) and (iv) comprise at least one UV-curable monomer compound the homopolymerisate of which comprises a glass transition temperature Tg of less than 0° C. in an amount of up to 40 wt. % with respect to the mass of the precursor.