Shear-activated innerseal

Details Shear-activated innerseal Shear-activated innerseal

C - Chemistry, Metallurgy

09

J

117/171, 206/20,

C09J 7/02 (2006.01) B29C 65/06 (2006.01) C09J 123/02 (2006.01) C09J 191/06 (2006.01)

Patent

CA 1192798

ABSTRACT 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.

400537

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