Meadwestvaco Corporation

P.h. Glatfelter Company

Westrock Mwv, LLC

John W Stolarz, Jr

Gary P Fugitt

Steven Paul Metzler

Terrell J Green

Scott E Ginther

Robert W Carlson

Stanley H McGrew, Jr

William N Justice

James Gregory Lovensheimer

Jr Stanley H Mcgrew

Steven P Metzler

A tamper evident document, a process of preparing the tamper evident document, and a tamper evident ink. The tamper evident document includes a paper substrate having a face for providing information, and a tamper evident ink applied on the face of the paper substrate. The tamper evident ink includes (i) microcapsules having a cross-linked polymer shell and a core surrounded by the shell; and (ii) developer particles. The cores of the microcapsules include at least one color former dissolved in a carrier oil. If information on the tamper evident document is altered by force or pressure (e.g., by scraping with a knife), the microcapsules rupture and the color former reacts with the developer particles to provide a visual indication of tampering (e.g., appearance of color or color change) on the face of the document.

Tamper evident documents and inks

A method for treating a substrate is described. In accordance with one aspect, the method includes applying a polymer coating to a substrate, and bringing the polymer coating into contact with a heated surface in a pressure nip while the coating is still in a wet state. Optionally the polymer coating may include a crosslinkable material, and a crosslinking agent may be used to promote crosslinking. The polymer coating replicates the heated surface. A product produced in accordance with the described method is also disclosed. The product is characterized by having subsurface voids within the coating.

Method for treating a substrate

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Circleville, OH, United States of America

John W Stolarz, Jr