G - Physics – 09 – F
Patent
G - Physics
09
F
G09F 3/02 (2006.01) C25D 11/04 (2006.01)
Patent
CA 2071987
2071987 9116701 PCTABS00008 The invention relates to a process for producing colour change devices incorporating latent indicia and colour change devices incorporating latent indicia produced by the process. The process involves anodizing a colour generating metal (11), having limited surface areas thereof covered by a mask (12), in the presence of an adhesion-reducing agent in order to produce a colour-generating laminate incorporating an anodic film (13) having detachable and non-detachable areas (b, a). The improvement of the invention involves forming the mask (12) from a masking material which permits anodization of areas of the surface covered by the mask while preventing the adhesion-reducing agent from exerting a substantial adhesion-reducing effect in the areas of the surface covered by the mask. The anodic film having the detachable and non-detachable areas (b, a) can then be formed by means of a single anodization step carried out in the presence of the adhesion-reducing agent. It is therefore unnecessary to employ two partial anodization steps as in the past, which simplifies the fabrication procedure and makes the procedure less expensive.
Alcan International Limited
Kirby Eades Gale Baker
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