| abstract |
A security film for shatterproofing windows comprises: at least two oriented polyethylene terephthalate self supporting strata having critical thicknesses for shock absorption and tensile strength, of which at least one optionally has a semi-transparent vapor deposited aluminum coat for solar control; and at least two relatively soft bonding strata having critical thicknesses for adhesion and cohesion, of which at least one is an internal copolyester stratum for bonding self supporting strata together and one is a pressure sensitive stratum at the outer surface of the film for application to window glass. |