Patent ID: 8501300
Filing Date: 2013-08-06
Classification: C08J,C09D,C09K,H01L,H05B,Y02E,Y02P,Y10S,Y10T

Abstract:
1. A method of manufacture of a coated polymeric film which comprises performing in sequence the steps of: (i) forming a substrate layer comprising poly(ethylene naphthalate) having a thickness in a range from 50 μm to 250 μm; (ii) stretching the substrate layer in at least one direction; (iii) heat-setting the substrate layer under dimensional restraint at a tension in the range of about 19 to about 75 kg/m of film width, at a temperature above the glass transition temperature of the poly(ethylene naphthalate) but below the melting temperature thereof; (iv) heat-stabilising the substrate layer under a tension of less than 5 kg/m of film width, and at a temperature above the glass transition temperature of the poly(ethylene naphthalate) but below the melting temperature thereof; and (v) disposing a coating layer on a surface of the substrate layer by a process comprising applying a planarising coating composition thereto such that a surface of said coating layer exhibits an Ra value of less than 0.6 nm, and/or an Rq value of less than 0.8 nm; and wherein the coating layer has a dry thickness in a range from 1 μm to 20 μm and the number of surface peaks in the range 300 to 600 nm per 5 cm