Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1989-02-03
1991-02-19
Seidleck, James
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
204 15, 204 42, 428469, 4284722, 428915, C25D 1104, B65D 8500
Patent
active
049943146
ABSTRACT:
A laminated color change device which exhibits an irreversible color change upon delamination. The device comprises two layers capable of generating a color by a light interference and absorption phenomenon that requires direct and intimate contact between the two layers. One of the layers is a color-generating metal, such as a valve metal (e.g. tantalum), and the other is an overlying light-transmitting film thin enough to cause light interference effects. The film is produced by coating the color generating metal with aluminum or an aluminum alloy and then anodizing (preferably porous anodizing) the aluminum to consumption in the presence of an adhesion-reducing agent, e.g. fluoride, that reduces the strength of attachment between the layers so that the laminate can be uniformly and reliably separated at the interface between the adjacent two layers. An overlying layer of transparent or translucent material is normally adhered to the laminate to facilitate the separation of the layers. When the thin film is detached from the color-generating metal, the generated color is lost, thus providing a color change that is in effect irreversible. The device can be incorporated into a variety of closable articles or products to provide evidence of opening or tampering, or can be used for other purposes.
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Rosenfeld Aron M.
Smits Paul
Alcan International Limited
Seidleck James
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