UV-curable hard coating compositions
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United States of America Patent
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Issued Date -
Oct 11, 2007
app pub date -
Apr 10, 2007
filing date -
Apr 11, 2006
priority date (Note) -
Abandoned
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Abstract
UV curable coating compositions containing a surface modified (functionalized) colloidal silica, an acrylic monomer, an epoxy monomer and a catalytic amount of a UV polymerization initiator that are essentially-free of water are described. The compositions can optionally include a wetting agent. To form the UV curable coating compositions, an acrylic monomer, epoxy monomer and an acrylate/vinyl silane-modified colloidal silica are mixed in an aqueous/organic solvent system to form a mixture. The method features unique solvent removal steps. Solvent is first removed from the mixture under vacuum until a gel begins to form. Once gel begins to form, solvent removal is stopped and a water miscible organic solvent is added to the mixture, thus redispersing the mixture along with any formed gel. After the mixture and any formed gel have been redispersed, the remaining solvent is removed under vacuum to form a coating composition that is gel free, optically clear and essentially-free of water. A catalytic amount of the UV polymerization initiator is added to the coating composition to facilitate curing.
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