Peelable sealant containing thermoplastic composite blends for packaging applications

摘要

A packaging system has a peelable seal section which includes a first sealing layer and a second sealing layer such that the first sealing layer contacts the second sealing layer to form a peelable seal. The first sealing layer includes thermoplastic polymer or a blend of thermoplastic polymers, an organoclay dispersed within the thermoplastic polymer, and an additional inorganic additive component, such as calcium carbonate, dispersed within the thermoplastic polymer. The peelable seal has achieved synergistic effect and offers high thermal conductivity, great caulkability and is consistent over a broad range of sealing temperatures without loss of desired peelable seal functionality as the seals age.

主权项

1. A packaging system having a peelable seal section, the peelable seal section including a first sealing layer and a second sealing layer such that the first sealing layer contacts the second sealing layer to form a peelable seal, the first sealing layer includes:
a thermoplastic polymer including ethylene vinyl acetate and linear low-density polyethylene; an organoclay dispersed within the thermoplastic polymer, the organoclay including a plurality of particles having at least one spatial dimension less than 200 nm; and calcium carbonate dispersed within the thermoplastic polymer, the calcium carbonate including a plurality of particles having an average diameter of 0.5 microns to 20 microns, the organoclay being present in an amount from 5 weight % to 20 weight % of the combined weight of the thermoplastic polymer and the organoclay and the calcium carbonate, and the calcium carbonate being present in an amount from 6 weight % to 25 weight % of the combined weight of the thermoplastic polymer and the organoclay and the calcium carbonate, the peelable seal having a peel force between 0.5 lbs and 5 lbs per inch of sealing width.