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Polymerizable composition comprising low molecular weight organic componentRelated Patent Categories: Stock Material Or Miscellaneous Articles, Liquid Crystal Optical Display Having Layer Of Specified CompositionPolymerizable composition comprising low molecular weight organic component description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060204676, Polymerizable composition comprising low molecular weight organic component. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001] Certain microreplicated optical products, such as described in U.S. Pat. Nos. 5,175,030 and 5,183,597, are commonly referred to as a "brightness enhancing films". Brightness enhancing films are utilized in many electronic products to increase the brightness of a backlit flat panel display such as a liquid crystal display (LCD) including those used in electroluminescent panels, laptop computer displays, word processors, desktop monitors, televisions, video cameras, as well as automotive and aviation displays. [0002] Brightness enhancing films desirably exhibit specific optical and physical properties including the index of refraction of a brightness enhancing film that is related to the brightness gain (i.e. "gain") produced. Improved brightness can allow the electronic product to operate more efficiently by using less power to light the display, thereby reducing the power consumption, placing a lower heat load on its components, and extending the lifetime of the product. [0003] Brightness enhancing films have been prepared from high index of refraction monomers that are cured or polymerized, as described for example in U.S. Pat. Nos. 5,908,874; 5,932,626; 6,107,364; 6,280,063; 6,355,754; as well as EP 1 014113 and WO 03/076528. [0004] Although various polymerizable compositions that are suitable for the manufacture of brightness enhancing films are known, industry would find advantage in alternative compositions. SUMMARY OF THE INVENTION [0005] Presently described are brightness enhancing films that comprise a brightness enhancing polymerized structure comprising the reaction product of a substantially solvent free polymerizable composition comprising an organic component and optionally an inorganic component. [0006] The organic component comprises one or more monomers and is free of any oligomeric ethylenically unsaturated monomer having a molecular weight (Mn) of greater than 450 g/mole. The organic component preferably has a viscosity of less than 1000 cps at 180.degree. F. [0007] The polymerizable composition comprises at least one ingredient that comprises at least two ethylenically unsaturated groups. For embodiments wherein the organic component is the totality of the polymerizable composition, at least one of the monomers comprises at least two ethylenically unsaturated groups. However, for embodiments wherein the organic component is combined with surface modified nanoparticles, the nanoparticles may have sufficient functionality such that the monomer(s) of the organic component may be monofunctional. [0008] In a preferred embodiment, the polymerizable composition comprises the organic component and at least 10 wt-% inorganic nanoparticles. BRIEF DESCRIPTION OF THE DRAWINGS [0009] The invention may be more completely understood in consideration of the following detailed description of various embodiments of the invention in connection with the accompanying drawings, in which: [0010] FIG. 1 is a schematic view of an illustrative micro-structured article of the present invention in a backlit liquid crystal display; [0011] FIG. 2 is a perspective view of an illustrative polymerized structure bearing a micro-structured surface; [0012] FIG. 3 is a cross-sectional view of an illustrative micro-structured article that has prism elements of varying height; [0013] FIG. 4 is a cross-sectional view of an illustrative micro-structured article that has prism elements of varying height; [0014] FIG. 5 is a cross-sectional view of an illustrative micro-structured article; [0015] FIG. 6 is a cross-sectional view of an illustrative micro-structured article in which the prism elements are of different heights and have their bases in different planes; [0016] FIG. 7 is a cross-sectional view of an illustrative micro-structured article; [0017] FIG. 8 is a cross-sectional view of an illustrative micro-structured article; [0018] FIG. 9 is a cross-sectional view of an illustrative micro-structured article; [0019] FIG. 10 is a schematic view of an illumination device including a turning film; [0020] FIG. 11 is a cross-sectional view of a turning film; [0021] FIG. 12 is a cross-sectional view of another turning film. 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