发明名称 Colour change devices incorporating thin anodic films.
摘要 <p>A laminated colour change device which exhibits an irreversible colour change upon delamination. The device comprises two layers (11 and 13) capable of generating a colour by a light interference and absorption phenomenon that requires direct and intimate contact between the two layers. One of the layers (11) is a colour-generating metal, such as a valve metal (e.g. tantalum), and the other (13) is an overlying light-transmitting film thin enough to cause light interference effects. The film (13) is produced by coating the colour generating metal (12) 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 (14) is normally adhered to the laminate to facilitate the separation of the layers. When the thin film (13) is detached from the colour-generating metal (11), the generated colour is lost, thus providing a colour 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.</p>
申请公布号 EP0381511(A1) 申请公布日期 1990.08.08
申请号 EP19900301085 申请日期 1990.02.02
申请人 ALCAN INTERNATIONAL LIMITED 发明人 ROSENFELD, ARON MARCUS;SMITS, PAUL
分类号 G02B5/28;B32B7/02;B32B7/06;B32B9/00;B32B15/08;B32B33/00;B44C5/08;C23C14/14;C23C28/00;C25D3/44;C25D11/02;C25D11/04;C25D11/26 主分类号 G02B5/28
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