Patent ID: 9523000
Filing Date: 2016-12-20
CPC Classification: B32B,C08J,C08K,C08L,Y10T

Claim Text:
1. A polyester film comprising non-heat-resistant particles supported thereon and having a thickness of 25 to 300 μm, in which after supporting the non-heat-resistant particles on at least one surface of an unstretched polyester film, the unstretched polyester film is stretched in at least one direction thereof, wherein the non-heat-resistant particles are supported on the polyester film by applying the coating solution comprising the non-heat-resistant particles thereonto, and wherein after applying the coating solution comprising the non-heat-resistant particles onto at least one surface of the unstretched polyester film and then stretching the unstretched polyester film in at least one direction thereof to form a coating layer thereon, another coating layer prepared from a coating solution comprising a metal oxide and two or more kinds of crosslinking agents, is formed on the coating layer or on a surface of the polyester film opposed to the surface on which the coating layer is formed and the metal oxide is at least one selected from the group consisting of zirconium oxide, titanium oxide, tin oxide, yttrium oxide, antimony oxide, indium oxide, zinc oxide, antimony tin oxide and indium tin oxide.