Patent ID: 6468641
Filing Date: 2002-10-22
Classification: B32B,B41M,C08J,Y10T

Abstract:
A backlit display comprising a polyester composite film comprising a primary transparent, unfilled polyester layer and a secondary filled polyester layer formed on at least one surface of the primary polyester layer, wherein the secondary polyester layer has a thickness of from 2.5 to 35 micrometers and comprises from 5 to 20% of the total thickness of the primary and the secondary polyester layers and comprises from 1 to 8%, by weight, based on the weight of the secondary polyester layer of finely divided silica particles having a volume weighted mean particle diameter D[4,3] of from 2.3 to 6.2 micrometers, a porosity of from 0.44 to 1.6 ml/g and a surface area of from 300 to 700 m2/g, coated on one or both exposed polyester surfaces with at least one of an adhesion promoting or antistatic aqueous or solvent based emulsion or solution polymer coating, said coating comprising a polyester resin and a polymer containing amino groups or a styrene containing acrylic polymer and a melamine-formaldehyde cross-linking agent, wherein said polyester composite film has (a) a total luminous transmission (TLF) of at least 30% measured according to ASTM Method D1003 and (b) an angular light scattering ratio (I2/I0) of at least 0.02 wherein I2 and I0 are the light intensities measured at an angle of 2 degrees and 0 degrees, respectively, from a line perpendicular to the plane of the film.