Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1979-12-06
1981-09-29
McCamish, Marion
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
428 1, 428 40, 4284244, 4284248, 428516, 428520, G02F 113
Patent
active
042923700
ABSTRACT:
A new moisture resistant polarizing lamination is disclosed which utilizes polypropylene as the protective layers. A polarizing film of polyvinyl alcohol which has been stretched and treated with iodine is protected against moisture and structurally supported by at least one layer of polypropylene. The polypropylene is bonded to the polyvinyl alcohol by adhesives which do not interfere with the polarizing effects of the lamination. The polypropylene may have a bonding layer already attached thereto which is covered by a protective film. The protective film is prevented from becoming secured to the bonding layer by a release agent placed between the protective film and bonding layer. The protective film is removed just prior to bonding of the polypropylene to the polyvinyl alcohol. Use of polypropylene films that are 0.002 inch thick is disclosed. Polypropylene films of this thickness do not adversely affect the polarizing qualities of the lamination. The PVA polarizing film in a sandwich of polypropylene may be provided with one exterior adhesive layer for ease in securing the lamination in its desired final location.
REFERENCES:
patent: 2524286 (1950-10-01), Dreyer
patent: 4025688 (1977-05-01), Nagy
Avery International Corporation
McCamish Marion
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