| 摘要 |
The present invention provides a laminate construction including a backing sheet (18), which may be in the form of a continuous web, and a face sheet (12) covering at least a portion of the backing sheet. A releasable adhesive (16) secures a first or lower surface (13) of the face sheet (12) to a first or upper surface (17) of the backing sheet (18) such that the face sheet and backing sheet are readily separable. The releasable adhesive (16) contains therein a first composition (22) which, when subjected to an imaging force, forms a latent image (28, 30) on both of the first surfaces of the face and backing sheets. This latent image may be developed at a later time by contacting the image with a second composition which, when exposed to the first composition, forms a visible image. In the laminate, the face sheet (12) may be imprinted with legible and/or covert information. The covert information may be duplicated on the underside of the face sheet or on one or more intermediate sheets as well as a backing sheet. The face sheet can then be readily peeled from the construction and be used as a label, tag, form, or the like. The underlying sheets retain the same information as the face sheet. The covert or latent information can be developed at a later time to produce a visible image. All elements of the construction have nontacky surfaces, permitting easy handling and storage. |
