Security film for shatterproofing windows

Claim 1

A process for producing a security window, said process comprising the steps of applying a security film to a window surface with a polar aqueous detergent interposed therebetween, said security film comprising an assemblage of strata including at least one first polyester support stratum, at least one second polyester support stratum, at least one elastomeric bonding stratum, and only one nonpolar pressure sensitive adhesive stratum, said one first polyester support stratum and said one second polyester stratum each being composed of polyethylene terephthalate and ranging from 0.5 to 5 mils in thickness, said one elastomeric bonding stratum being composed of polyurethane and being interposed between said one first polyester support stratum and said one second polyester support stratum and in direct contact with the inner faces of said one first polyester support stratum and said one second polyester support stratum, said polyurethane bonding stratum ranging in thickness from 0.2 to 0.4 mil, said pressure sensitive stratum being coated on one of the outer faces of said assemblage for adhesion to said only one face of only one sheet of window glass, said pressure sensitive stratum being composed of a composition including a rubber and a tackifier and ranging in thickness from 0.5 to 1.5 mil, all of the strata of said assemblage being optically clear and moisture permeable, said pressure sensitive stratum being deactivated by said aqueous detergent, and permeating water from said aqueous detergent out of the interface between said security film and said window surface in order to reactivate said pressure sensitive adhesive stratum.