Claims
- 1. A laminated multilayer film substrate comprising:
- (a) an inbalanced biaxially oriented full layer comprising at least about 50 weight percent of a high density polyethylene having a density of at least about 0.95, said first layer oriented in at least a first direction to a degree which is at least three times greater than the degree of orientation present in a direction substantially normal to said first direction; and
- (b) an imbalanced biaxially oriented second layer comprising at least about 50 weight percent of a high density polyethylene having a density of at least about 0.95, said second layer oriented in at least a first direction to a degree which is at least three times greater than the degree of orientation present in a direction substantially normal to said first direction;
- whereto said second layer is laminated to the film substrate so that said first direction of orientation of said second layer is substantially normal to said first direction of orientation of said first layer and wherein (a) further comprises a coextruded propylene copolymer skin on its inner side and wherein positioned between said first and second layers is an optically-variable device.
- 2. The film substrate of claim 1 wherein said optically-variable device is selected from the group consisting of diffraction gratings, liquid crystals, moire patterns produced by cross-gratings with or without superimposed, refractive, lenticular and transparent grids, spaced partially-reflective, and partially transparent, coatings yielding variable interference patterns, bi-refringent or polarising layers and zone-plates.
- 3. The film substrate of claim 2 in the form of a bank note.
- 4. The film substrate of claim 1 wherein said optically-variable device is a reflecting diffraction grating comprising a metallized thermoplastic film embossed with a diffraction pattern.
- 5. The film substrate of claim 4 in the form of a bank note.
- 6. The film substrate of claim 1 in the form of a bank note.
- 7. The film substrate of claim 1 wherein said optically variable device is a Fresnel lense.
Parent Case Info
This is a division of application Ser. No. 08/601,886, filed on Feb. 15, 1996, now U.S. Pat. Nos. 5,618,630.
US Referenced Citations (15)
Divisions (1)
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Number |
Date |
Country |
Parent |
601886 |
Feb 1996 |
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