Abstract: A new moisture resistant polarizing lamination is disclosed which utilizes polypropylene as the protective layers. A polarizing film of polyvinyl alcohol which has been stretched and treated with iodine is protected against moisture and structurally supported by at least one layer of polypropylene. The polypropylene is bonded to the polyvinyl alcohol by adhesives which do not interfere with the polarizing effects of the lamination. The polypropylene may have a bonding layer already attached thereto which is covered by a protective film. The protective film is prevented from becoming secured to the bonding layer by a release agent placed between the protective film and bonding layer. The protective film is removed just prior to bonding of the polypropylene to the polyvinyl alcohol. Use of polypropylene films that are 0.002 inch thick is disclosed. Polypropylene films of this thickness do not adversely affect the polarizing qualities of the lamination.

Abstract: An undersurface imprintable label construction includes at least a translucent film having a layer of adhesive applied to a portion of its undersurface. One or more non-adhesive indicia-receiving zone(s) are on the undersurface of the film to form translucent window(s) on the film. A pressure-sensitive adhesive layer surrounds the window(s) and is releasably secured to a release liner which contains an indicia-transferring layer, such as a reverse carbon paper sheet, facing the undersurface of the film window(s). The undersurface of the film window area being disposed adjacent the indicia-transferring layer in the release liner allows visual indicia to be transferred from the indicia-transferring layer and imprinted on the undersurface of the window area(s) in response to pressure impact being applied to the upper surface of the film window area(s). The undersurface of the film may be partially masked to make the label substantially tamperproof.