Thermoformable copolyester laminate
AssigneeDuPont Teijin Films U.S. Limited Partnership
InventorsFenghua Deng, Peter N. Nugara, Stephen K. Franzyshen, Reps M. Haskins
Life of this patent
Estimating the term…
Abstract
A laminate includes the following substantially coextensive layers in the following order: (a) a non-sealable, self-supporting, thermoformable copolyester film layer having a first surface and a second surface, the second surface constituting an outermost, exposed surface of the laminate; (b) a laminating adhesive layer on the first surface of the thermoformable copolyester film layer; and (c) a self-supporting, thermoformable structural film layer having a first surface and a second surface, the first surface contacting the laminating adhesive layer.
Claims17
(canceled)
A package comprising
- (i) a laminate comprising the following substantially coextensive layers in the following order
- (a) a non-sealable , self-supporting, thermoformable copolyester film layer having a first surface and a second surface, said second surface constituting an outermost, exposed surface of the laminate;
- (b) a laminating adhesive layer on the first surface of the thermoformable copolyester film layer;
- and
- (c) a self-supporting, thermoformable structural film layer having a first surface and a second surface, said first surface contacting the laminating adhesive layer;
- wherein polyethylene terephthalate constitutes at least 80% by weight of the self-supporting thermoformable copolyester film layer;
- the thermoformable structural film layer comprises a polymer selected from the group consisting of polyamides, polypropylene, polyethylene, polyethylene terephthalate, ionomers, ethylene acrylic acid copolymers, ethylene vinyl acetate copolymers, polystyrene, ethylene vinyl alcohol copolymers and polyvinylidene chloride;
- and wherein the laminate is in the shape of a thermoformed receptacle having a pocket with a flange and an opening, the second surface of the copolyester film layer forming an inner surface of the pocket and a mating surface of the flange;
- and
- (ii) a heat-sealable film comprising a self-supporting polymeric film having on a surface thereof a substantially coextensive heat-seal layer,
- wherein the opening of the receptacle is closed by the heat-sealable film,
- wherein the heat-seal layer of the heat-sealable film is in contact with and bonded to the mating surface of the flange of the thermoformed receptacle.
Dependencies are inferred from the claim text.