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US 4,475,241 AGranted
Polycarbonate coated films
AssigneeAmerican Can Company
InventorsRobert L. Mueller, George O. Schroeder
Life of this patent
Estimating the term…
Abstract
A packaging film is disclosed which comprises a base sheet coated with a polycarbonate coating. The base sheet may be chosen with substantial latitude. The invention also contemplates a process for making the film.
Claims23
A flexible packaging sheet structure, comprising:
- (a) a base sheet, said base sheet having two opposing surfaces, one of said surfaces comprising a thermoplastic polymeric composition;
- (b) a primer on said one surface;
- (c) a polycarbonate coating on said primer, said primer being disposed between said base sheet and said polycarbonate coating;
- and
- (d) a heat sealable material on the other said surface of said base sheet.
2 more elements
A package, said package comprising:
- sidewalls, said sidewalls being constructed of a flexible film, said film comprising a base sheet having two opposing surfaces, one said surface of said base sheet being disposed toward the exterior of the package, said one surface having a primer thereon;
- a polycarbonate coating on said primer, said primer being disposed between said base sheet and said polycarbonate coating;
- the other said surface of said base sheet being disposed toward the interior of said package and having a heat sealable material thereon, said package having been fabricated with the formation of heat seals between facing elements of said film on the interior surfaces of said package.
A process for making a packaging film structure, comprising:
- (a) extruding and solidifying a polymeric base sheet;
- (b) treating one surface of said base sheet with electrical discharge;
- (c) printing indicia on said one surface of said base sheet;
- (d) coating said one surface of said base sheet with a primer;
- (e) drying and curing said primer;
- and
- (f) extrusion coating said one surface of said base sheet with a polycarbonate coating.
4 more elements
A process for making a packaging film structure, comprising:
- (a) extruding and solidifying a polymeric base sheet;
- (b) treating one surface of said base sheet with electrical discharge;
- (c) coating said one surface of said base sheet with a primer;
- (d) drying and curing said primer;
- and
- (e) extrusion coating said one surface of said base sheet with a polycarbonate coating.
3 more elements
A process for making a packaging film structure, comprising:
- (a) forming a base sheet having two opposing surfaces, one of said surfaces comprising a thermoplastic polymeric composition;
- (b) treating said one surface of said base sheet with electrical discharge;
- (c) printing indicia on said one surface of said base sheet;
- (d) applying a primer to said one surface of said base sheet;
- and
- (e) extrusion coating said one surface of said base sheet with a polycarbonate coating.
3 more elements
A process for making a packaging film structure, comprising:
- (a) forming a base sheet having two opposing surfaces, one of said surfaces comprising a thermoplastic polymeric composition;
- (b) treating said one surface of said base sheet with electrical discharge;
- (c) applying a primer to said one surface of said base sheet;
- and
- (d) extrusion coating said one surface of said base sheet with a polycarbonate coating.
2 more elements
Dependencies are inferred from the claim text.