Transparent overlay for protecting a document from tampering
First Claim
1. A document having a transparent overlay comprising:
- (a) a transparent cover sheet,(b) a layer of hot-melt adhesive over one surface of said transparent covering, which adhesive has a Tg of at least about -15°
C., and(c) a polymeric image-receiving layer over the exposed face of said hot-melt adhesive layer, which image-receiving layer is no more than about 50 μ
m in thickness,said overlay being bonded to the document by said hot-melt adhesive.
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Accused Products
Abstract
A transparent overlay that can protect a document from tampering has a transparent cover sheet, a layer of hot-melt adhesive over one surface of the transparent cover sheet, and a polymeric image-receiving layer over the exposed face of said hot-melt adhesive layer. The transparent cover sheet can be a simple thermoplastic film but preferably is retroreflective sheeting which can bear a pattern or legend that is noticeable only when viewed retroreflectively. When the polymeric image-receiving layer is dye-receptive, it can be imaged by using a thermal printing head with a dye-donor element. A preferred polymeric image-receiving layer that is dye-receptive is chlorinated poly(vinylchloride).
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Citations
16 Claims
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1. A document having a transparent overlay comprising:
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(a) a transparent cover sheet, (b) a layer of hot-melt adhesive over one surface of said transparent covering, which adhesive has a Tg of at least about -15°
C., and(c) a polymeric image-receiving layer over the exposed face of said hot-melt adhesive layer, which image-receiving layer is no more than about 50 μ
m in thickness,said overlay being bonded to the document by said hot-melt adhesive. - View Dependent Claims (2, 16)
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3. A document as defined in claim wherein said transparent cover sheet comprises retroreflective sheeting.
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4. A document as defined in claim wherein said retroreflective sheeting bears a pattern or legend that is readily legible only when the document is viewed retroreflectively.
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5. A document as defined in claim wherein said transparent cover sheet is a thermoplastic film.
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6. A transparent overlay by which a document can be protected from tampering, said overlay comprising:
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(a) a transparent flexible cover sheet (b) a layer of hot-melt adhesive over one surface of said transparent cover sheet, which adhesive has a Tg of at least about -15°
C., and(c) a polymeric image-receiving layer over the exposed face of said hot-melt adhesive layer, which image-receiving layer is no more than about 50 μ
m in thickness. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification