Coated polyester films

An electronic or opto-electronic device comprising a coated polyester film comprising a polyester film substrate and a coating on at least one side of the polyester film substrate, wherein the coating is derived from a coating composition comprising:

• (i) a melamine crosslinker component;
• and (ii) a polyurethane component derivable from at least one diisocyanate and at least one polymeric polyol, wherein the melamine crosslinker component (i) and the polyurethane component (ii) taken together constitute at least 80% by weight of the solids in the coating composition, wherein the coating composition has a solids content of at least 20% by weight, and wherein the weight ratio of the polyurethane component (ii) relative to the melamine crosslinker component (i) is in the range of from 1% to 200%, and wherein said coated polyester film is disposed such that the coating layer defines an external surface of said electronic or opto-electronic device;
• wherein the coated polyester film substrate provides a percentage of scattered light in the wavelength range 400 nm to 700 nm of no more than 30% or a total luminous transmission for light in the wavelength range 400 nm to 700 nm of at least 80%,
• wherein the polyester film substrate is a polyethylene terephthalate film or a polyethylene-2,6-naphthalate film, and
• wherein the polyester film substrate has a thermal shrinkage after being held at a temperature of 150° for 30 minutes in the range of from about 0.1% to 5% in the machine direction and in the range from 0% to about 5% in the transverse direction.