Patent ID: 6893696

Claim:
A rupturable seal comprising: a first polymer having a first melting point; a second polymer having a second melting point; and a sealing interlayer having a first side opposite a second side, said first side including a first boundary layer bonded to a portion of said first polymer, said second side including a second boundary layer bonded to a portion of said second polymer, said sealing interlayer having a melting point higher than said first melting point and said second melting point, said sealing interlayer comprising a plurality of micro-fibers having an average effective fiber diameter from about 2.5 μm to about 7.0 μm, said first boundary layer including a first portion of said plurality of micro-fibers surrounded by said first polymer, said second boundary layer including a second portion of said plurality of micro-fibers surrounded by said second polymer, said rupturable seal having a frangible interface between said first boundary layer and said second boundary layer, said rupturable seal parting at said frangible interface by application of a force causing separation of said first boundary layer from said second boundary layer.