Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1982-12-01
1985-02-26
Lesmes, George F.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
2642884, 2642902, 428343, 428354, 428347, 428516, 428520, 428522, 428 35, B32B 2700
Patent
active
045017972
ABSTRACT:
An unbalanced polymeric film has a plurality of adjacent molecularly oriented layers. The first, second, and third layers are molecularly oriented, and are, respectively (1) polypropylene, (2) anhydride modified polypropylene and (3) a barrier layer of either ethylene vinyl alcohol or nylon or a blend of ethylene vinyl alcohol and nylon. A fourth layer is optionally oriented and serves as a heat sealable layer having good adhesion to the barrier layer. In a more sophisticated structure, the fourth layer is oriented and serves an adhesive layer between the barrier layer and a fifth sealant layer. The fifth layer is then optionally oriented. A process for making the films comprises heating the exterior surfaces of the two surface layers to a temperature between 10.degree. and 100.degree. F. below the respective heat sealing temperature of each of the respective surface layers, stretching the so-heated film, annealing the stretched film, and cooling the annealed film.
REFERENCES:
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patent: 4188443 (1980-02-01), Mueller et al.
patent: 4194039 (1980-03-01), Mueller
patent: 4261473 (1981-04-01), Yamada et al.
patent: 4360550 (1982-11-01), Asakura et al.
patent: 4407897 (1983-10-01), Farrell et al.
patent: 4410582 (1983-10-01), Tsunashima et al.
Haffner William B.
Hsu Joseph C.
Jesse Jerry F.
Super Scott S.
American Can Company
Bowie Stuart S.
Buffalow E. Rollins
Lesmes George F.
Wilhelm Thomas D.
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