Patent ID: 7527840

Claim:
A multilayered flexible laminate having an integrated pressure release valve and for use with a container, comprising: a. a first lamina having at least one inlet channel that passes through the first lamina; b. a second lamina having at least one outlet channel that passes through the second lamina; c. the first and second laminas at least partially bonded to one another about an unbonded valve region having open and closed orientations and having a liquid film disposed therein; and d. particles mixed with the liquid film at a location proximate to the inlet channel wherein the inlet and outlet channels preferentially permit gaseous communication in one direction within the valve region when the valve region is in the open orientation; wherein the inlet channel is open to the inside of the container to permit one direction gaseous communication from the inside of the container into the valve region; and wherein the particles comprise a particle selected from the group consisting of powdered polymers, silica, carbon, carbon black, and mixtures thereof.