Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1981-05-22
1982-04-27
Van Balen, William J.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
4283199, 4283173, 428355, 156262, 156 735, 156212, 156292, 1563096, 156334, B32B 516, B32B 702, B32B 2718
Patent
active
043271472
ABSTRACT:
The present invention discloses a sheet material useful as an innerseal that comprises a dimensionally stable substrate having at least 0.001 g/cm.sup.2 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 adhere 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.
REFERENCES:
patent: 3265765 (1966-08-01), Holden et al.
patent: 3787531 (1974-01-01), Dahlquist et al.
patent: 3995087 (1976-11-01), Desanzo
patent: 4039705 (1977-08-01), Douek et al.
patent: 4061820 (1977-12-01), Magid et al.
patent: 4086388 (1978-04-01), Brown
patent: 4287013 (1981-09-01), Ronning
Cap-Seal.RTM. Closure Liners, 3M Company, Publication FP-C-ADSAM , (68.05)11, 1980.
Protect Product Purity, 3M Company, Publication FP-SG1B7, (67.2)JR, 1979.
Alexander Cruzan
Lilly James V.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Van Balen William J.
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