Abstract: Piezoelectric films including ionic liquids and methods of making piezoelectric films including ionic liquids are described herein. The resulting films have higher levels of beta phase and can be poled using external fields without additional treatment, such as stretching. The films are light-transparent. In some embodiments, the piezoelectric material is used to create piezo-electrophoretic films that can be patterned for use as security markers, authentication films, or sensors. The films are generally flexible. Some films are less than 100 ?m in thickness. Electrophoretic displays formed from the piezoelectric films do not require an external power source.

Abstract: Low-profile piezo-electrophoretic films and display films including low profile piezo-electrophoretic films are disclosed herein. In some embodiments, the piezoelectric material of the piezo-electrophoretic films can be patterned with high-voltage electric fields after fabrication of the piezo-electrophoretic films. Such films are useful as security markers, authentication films, or sensors. The films are generally flexible. Some films are less than 100 ?m in thickness. Displays formed from the films do not require an external power source.

Abstract: Piezoelectric films including ionic liquids and methods of making piezoelectric films including ionic liquids. The resulting films have higher levels of beta phase and can be poled using external fields without additional treatment, such as stretching. The films are light-transparent. In some embodiments, the piezoelectric material is used to create piezo-electrophoretic films that can be patterned for use as security markers, authentication films, or sensors. The films are generally flexible. Some films are less than 100 ?m in thickness. Electrophoretic displays formed from the piezoelectric films do not require an external power source.

Abstract: A tamper evident security document including: a transparent substrate; an ink receptive coating applied to at least one side of the substrate, said coating including a laser markable additive dispersed therein; at least one laser formed marking or image created in the coating by exposure of the laser markable additive to laser radiation; and printed data applied to the ink receptive coating; wherein the marking or image in the coating is removed or destroyed upon an attempt to alter the printed data.

Abstract: A security article is provided having a multicoloured image and which comprises a first layer of transparent polymeric material carrying parts of an image formed in a first colour; and at least one other layer of transparent polymeric material carrying parts of the image formed in a different colour. The layers are laminated together with the parts of the image formed in the first and different colours superposed over one another, whereby the colours combine to form a multicoloured image in the laminated security article. In one embodiment, the multi coloured image is viewable from both sides of the security article, and in another form an opaque layer may be provided on one side of the transparent layers to provide a background for viewing the image in reflection from one side of the article.

Abstract: A security device (3) and a method of forming a security device (3) is provided in which a sheet (1) has a substantially transparent or translucent layer (10) and a reflective layer (11) with at least part of the reflective layer (11) being visible through the transparent or translucent layer (10) from a first side of the sheet (1). The sheet (1) is blind embossed from the first side through the transparent or translucent layer (10) and onto the reflective layer (11) to form a transitory embossed image (3). The transitory embossed image (3) may be provided in a window or half-window (2) formed by applying one or more opacifying layers (14) to the substrate (10) except in the area containing the reflective layer (11) and transitory embossed image (3) on one or both sides of the substrate (10). In one embodiment, the reflective layer is a highly reflective metallic ink (11).