Patent ID: 9222004
Filing Date: 2015-12-29
Classification: B32B,C08L,C09J,Y10S,Y10T

Abstract:
1. An intrusion resistant thermal laminating film comprising: (a) a self-supporting polymeric substrate having a glass transition temperature of not greater than about 95° C., and the polymeric substrate is selected from the group consisting of a polycyclohexylenedimethylene terephthalate (PCTA), glycol-modified polycyclohexylenedimethylene terephthalate (PCTg), and combinations thereof; (b) a thermal adhesive system adhered to said polymeric substrate to form an intrusion resistant thermal laminating film, said adhesive system comprising a blend of one or more alkyl acrylate or alkyl acrylic acid copolymers selected from the group consisting of ethylene acrylic acid (EAA), ethylene methacrylate (EMA) and combinations thereof; and one or more low density polyethylenes, said adhesive system having a Vicat softening point that is below the polymeric substrate glass transition temperature and between about 80° C. and 95° C., said adhesive system having a melt flow index (MFI) of about 15 grams or less per ten minutes; and (c) the intrusion resistant thermal laminating film maintains adhesion between the adhesive system and the polymeric substrate and achieves cohesive failure of the adhesive system upon subjecting the intrusion resistant thermal laminating film to an elevated temperature below the polymeric substrate glass transition temperature.