Back to results
US 12,234,078 B2Granted
Thermoformable copolyester laminate
AssigneeMylar Specialty 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.
Claims15
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,
- wherein the copolyester contains terephthalic acid, azelaic acid and one or more glycols,
- wherein non-sealable means that the thermoformable copolyester film layer has a heat-seal strength of less than 200 g/25 mm, wherein heat-seal strength is determined by bonding the thermoformable copolyester film layer to itself at 160° C. for 0.5 seconds under a pressure of 80 psi (0.55 N/mm2), cooling it to room temperature, cutting it into 25 mm wide strips, and measuring the force required under linear tension per unit width to peel the layers apart at a constant speed of 0.25 m/minute;
- (b) a laminating adhesive layer on the first surface of the thermoformable copolyester film layer, wherein the laminating adhesive layer is derived from a solventless polyurethane system;
- 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 polyamide;
- 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 polyamide film laminated to a self-supporting polyester film wherein said self-supporting polyester film has 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;
- and
- wherein the heat-seal layer ruptures and vents the package at a temperature in a range from 150° F. (65.6° C.) to 450° F. (232.2° C.).
13 more elements
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,
- wherein the copolyester contains terephthalic acid, azelaic acid and one or more glycols,
- wherein non-sealable means that the thermoformable copolyester film layer has a heat-seal strength of less than 200 g/25 mm, wherein heat-seal strength is determined by bonding the thermoformable copolyester film layer to itself at 160° C. for 0.5 seconds under a pressure of 80 psi (0.55 N/mm2), cooling it to room temperature, cutting it into 25 mm wide strips, and measuring the force required under linear tension per unit width to peel the layers apart at a constant speed of 0.25 m/minute;
- (b) a laminating adhesive layer on the first surface of the thermoformable copolyester film layer, wherein the laminating adhesive layer is derived from a solventless polyurethane system;
- 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 polyamide;
- 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 polyamide film laminated to a self-supporting polyester film wherein said self-supporting polyester film has 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;
- and
- wherein the heat-seal layer ruptures and the package vents only at a temperature above 210° F. (98.9° C.).
13 more elements
Dependencies are inferred from the claim text.