| 摘要 |
<p>The present invention discloses a sheet material useful as an innerseal that comprises a dimensionally stable substrate having at least 0.001 g/cm2 of a tack-free, shear-activated adhesive on one surface. The composition includes from 1 to 15 parts by weight of a block copolymer, from 1 to 25 parts by weight of a tackifier, and from 60 to 100 parts by weight of either a microcrystalline wax or an amorphous polyolefin. A mixture of the two can be used. The sheet material is shear-activated and does not adhere or block to itself or other surfaces until a shear force is applied to it. Additionally, it does not require special heating equipment in order to ahdere it to surfaces. In a preferred aspect of the invention the innerseal leaves a residue on the lip around a container opening thereby providing a visible indication of removal.</p> |
