Patent ID: 6709740
Filing Date: 2004-03-23
Classification: B32B,Y10T

Abstract:
An ultralow haze thermoplastic polyester film comprising a substantially particle-free polyethyleneterephthalate core layer and skin layers on each side of the core layer prepared by co-extrusion of a blend of polyethyleneterephthalate with inorganic and organic fillers in the skin layers, wherein said inorganic fillers are selected from the group consisting of aluminum oxide particles, silicon dioxide, zirconium oxide, titanium dioxide, tin oxide, calcium carbonate, barium sulfate, calcium phosphate, zeolite, hydroxy apatite, aluminum silicate and mixtures thereof, having particle size of about 0.035 &mgr;m to abut 0.30 &mgr;m and are present in an amount of about 0.4% to about 0.8% by weight, based on the weight of the polyethyleneterephthalate, and wherein particles of said organic filler have a particle size of less than or equal to 0.8 &mgr;m and are present in an amount less than 0.04% by weight, based on the weight of the polyethyleneterephthalate, said skin layers being less than 3 &mgr;m in thickness and said film having &lE;0.6% haze.