Patent ID: 9533805
Date: 2017-01-03
CPC Classifications: B32B,B65D,C09J,Y10T

Claim:
1. A primary laminate configured to form a tabbed container sealing member having a tab defined wholly within a perimeter thereof, the primary laminate comprising: a seal laminate including at least a bottom layer for securing to a rim surrounding a container opening, a foil layer, and a top polyester film layer; a tab stock film layer with a top and bottom face wherein the bottom face of the tab stock film layer is above the top polyester film layer of the seal laminate to form a primary substrate; an upper surface of the primary substrate having a first and a second portion wherein the first portion is formed by the top polyester film layer and the second portion is formed by the top face of the tab stock film layer; a layer of plastic film adhered to both the top face of the tab stock film layer and the top polyester film layer by an extruded polymeric adhesive, the layer of plastic film selected from polyethylene terephthalate, polyamide, polypropylene or a composite thereof, and the extruded polymeric adhesive selected from polyethylene, polyethylene vinyl acetate, maleic anhydride/acrylate ester/polyethylene copolymer, and ethylene methyl acrylate; a bond between the layer of plastic film and the top polyester film layer formed by the layer of extruded polymeric adhesive of at least about 15 N/cm; and further comprising a secondary seal stock having an overall stiffness in the range from 200-1200 gcm and wherein the layer of plastic film of the primary laminate is bonded to the secondary seal stock by a second extruded polymeric adhesive having a melt flow index of 5 to 25 dg/min, wherein the secondary seal stock is configured to remain in a screw cap and separate from the primary laminate when the screw cap is removed from a container.