Coated thermoplastic film substrate

A coated thermoplastic film substrate comprising:

• a thermoplastic film substrate having an upper and lower surface, wherein, when not coated, the upper surface is textured, has a gloss of at least 85% as measured at 85 degrees in accordance with ASTM D523, and a surface roughness of about 20 to about 40 micrometers, and wherein the lower surface is polished;
• and
• an ultraviolet radiation cured acrylic coating on the upper surface, wherein the cured acrylic coating has a surface gloss of at least 90%, a birefringence of less than 25 nanometers, and a surface roughness of about 3.0 to about 10.0 micrometers;
• wherein the coated thermoplastic film substrate has a delta refractive index of less than about 0.1 between the acrylic coating and the thermoplastic film substrate;
• wherein the cured acrylic coating;
• comprises an ultraviolet radiation reaction product of coating composition comprising a brominated epoxy acrylic oligomer, a functional acrylate monomer, an organopolysiloxane hardcoat composition and a photoinitiator;
• and
• wherein the cured acrylic coating was directly adhered to the thermoplastic film substrate by heating the coating composition to a temperature between about 90° F. and about 150° F. and ultraviolet radiation curing the heated coating composition to form an interlocking bond between the substrate and cured acrylic coating.

A method of making a coated thermoplastic film substrate, comprising:

• disposing a thermoplastic material between rollers to produce a thermoplastic film substrate having an textured upper surface having a gloss of at least 85% as measured at 85 degrees in accordance with ASTM D523 and a surface roughness of about 20 to about 40 micrometers;
• applying an acrylic coating to the upper surface;
• and
• curing the acrylic coating with ultraviolet radiation;
• wherein the cured acrylic coating has low birefringence surface roughness of about 3.0 to about 10.0 micrometers, and wherein the coated thermoplastic film substrate has a delta refractive index of less than about 0.1 between the cured cured acrylic coating and thermoplastic film substrate.