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US 9,067,451 B2Granted
Laser markable security film
AssigneeAgfa-Gevaert
InventorsCarlo Uyttendaele, Bart Aerts, Bart Waumans, Ingrid Geuens
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Abstract
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.
Claims17
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;
- and
- ii) a laser markable polymer or polymers selected from the group consisting of polystyrene, polycarbonate and styrene acrylonitrile.
4 more elements
Dependencies are inferred from the claim text.