Thin microstructured optical films

摘要

Presently described are optical films, such as a brightness enhancing film, having a polymerized microstructured surface disposed on a preformed polymeric film wherein the film has a thickness of no greater than 3 mils and the polymerized microstructured surface consists of the reaction product of a substantially non-brominated polymerizable resin composition.

主权项

1. A brightness enhancing film having a polymerized microstructured surface comprising a plurality of prisms, disposed on a preformed polymeric polyethylene terephthalate film and the polymerized microstructured surface is a reaction product of a non-brominated polymerizable resin composition comprising
i) at least about 60 wt-% of one or more bisphenol di(meth)acrylate monomers selected from the group consisting of and a mixture of  and ii) about 5 wt-% to about 40 wt-% of one or more (meth)acrylate diluents having a viscosity of less than 300 cps at 25° C. selected from the group consisting of phenoxy ethyl acrylate, 2-phenyl-phenyl acrylate, tetraethylene glycol diacrylate and mixtures thereof; wherein the non-brominated polymerizable composition comprises 0 to 15 wt-% of components comprising three or more (meth)acrylate groups; wherein the preformed polymeric polyethylene terephthalate film has a thickness of less than or equal to about 2 mils and the brightness enhancing film exhibits curl from 0 mm to less than 2 mm.