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US 9,222,004 B2Granted
Intrusion resistant thermal laminating film
AssigneeTransilwrap Company, Inc.
InventorsTimothy W. Albert, Robert C. Flaherty
Life of this patent
Estimating the term…
Abstract
A thermal laminating film is provided that has superior intrusion resistance that is well suited to addressing security and anti-counterfeiting needs. The film includes a polymer substrate and an adhesive system with a polymer component having a Vicat softening point temperature that is close to a glass transition temperature of the polymeric substrate, which typically is not greater than about 95° C.
Claims15
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.
2 more elements
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., the polymeric substrate being 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;
- (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;
- and
- wherein said thermal adhesive system comprises between about 75 weight percent and about 100 weight percent ethylene acrylic acid (EAA) and up to about 25 weight percent of ethylene methacrylate (EMA) copolymer, based on the total weight of the alkyl acrylate or alkyl acrylic acid copolymer.
3 more elements
Dependencies are inferred from the claim text.