Patent ID: 8754144

Claim:
A heat-sealable coating composition curable by actinic radiation comprising: a. 70 wt % to 99 wt % based on the total weight of said composition, a monomer mixture selected from a member of the group consisting of a monofunctional (meth)acrylate monomer, a multifunctional (meth)acrylate monomer, and mixtures thereof; b. 0.1 wt % to 30 wt % based on the total weight of said composition, a heat sealable resin selected from a member of the group consisting of a vinyl modified diene block copolymer, a diene block copolymer, a vinyl modified diene, and mixtures thereof, wherein said heat sealable resin is dissolved or finely dispersed in said monomer mixture; and c. 1 wt % to 30 wt % based on the total weight of said composition, at least one photoinitiator; wherein the monofunctional (meth)acrylate monomer is selected from a member of the group consisting of isobornyl acrylate, isobornylmethacrylate, isodecyl acrylate, isooctyl acrylate, isooctyl methacrylate, lauryl acrylate, lauryl methacrylate, octadecyl acrylate, stearyl acrylate, stearyl methacrylate, tetrahydrofuryl acrylate, tridecyl acrylate, phenoxyethyl methacrylate, methyl methacrylate, butyl acrylate, 2-phenoxyethyl acrylate, tridecyl methacrylate, and mixtures thereof; and wherein the said multifunctional (meth)acrylate monomer is selected from a member of the group consisting of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol triacrylate, pentaerythritol tri-tetraacrylate, ethyleneoxidetrimethyloipropane tri(meth)acrylate and mixtures thereof; and wherein the heat-sealable coating composition is coated and cured on a blister-board substrate to form a cured coating, and the cured coating is then heat-sealed under pressure and temperature to a blister-cell plastic, and wherein the composition comprises metal-oxide nanoparticles selected from a member of the group consisting of zinc oxide, titanium dioxide, magnetite, cerium oxide and mixtures thereof; and the metal-oxide nanoparticles are present in an amount from about 0.1 wt % to 3 wt % of the total weight of the heat-sealable coating composition.