Laser markable security film

摘要

A security film including, in order, a transparent biaxially oriented polyethylene terephthalate support (1), a subbing layer (2, 2′) and a laser markable layer (3, 3′) comprising a laser additive and one or more polymers selected from the group consisting of polystyrene, polycarbonate and styrene acrylonitrile.

主权项

1. A transparent security film including in order:
a) a biaxially oriented polyethylene terephthalate support SUP; b) a subbing layer SL1; and c) a laser markable layer LML comprising:
i) carbon black having an average particle size of less than 300 nm as a laser additive, wherein the carbon black is present in an amount of less than 0.08 wt % based on the total weight of the laser markable polymer or polymers; andii) a laser markable polymer or polymers selected from the group consisting of polystyrene, polycarbonate and styrene acrylonitrile.