Clear to colored security film

Film de surete de transparent a colore

Abstract

A multilayer film including multiple polymeric layers designed and made to enable the film to reflect light in the near infrared (IR) portion of the visible spectrum. Depending on the amount and range of red light that is reflected, the film of the present invention appears under certain conditions to exihit a visible color, commonly cyan. The film appears to be substantially clear when viewed against a diffuse white background from approximately a zero degree observation angle, and appears to be cyan when viewed against that background from an observation angle that is greater than a predetermined shift angle.
Film multicouche comportant des couches polymères multiples conçues et fabriquées de façon à permettre à ce film de réfléchir la lumière dans la partie infrarouge proche (IR) du spectre visible. Ce film montre, dans certaines conditions, une couleur visible, généralement cyan, en fonction de la quantité et de la gamme de lumière rouge réfléchie. Il est pratiquement transparent quand on le visualise sur un arrière-plan blanc diffus depuis un angle d'observation d'approximativement zéro degré et présente une coloration cyan quand on le visualise sur le même arrière plan depuis un angle d'observation supérieur à un angle de déplacement prédéterminé.

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