B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 11/00 (2006.01) B29C 35/08 (2006.01) B29C 39/12 (2006.01) B29C 39/24 (2006.01) B29C 31/10 (2006.01)
Patent
CA 2211266
For the fast and rational manufacture of moulded articles, specifically contact lenses, that are partly coloured or have regions of different colours, by the casting process, measured amounts of two or more crosslinkable materials (6, 7) of different colours are introduced into the casting mould (40) in the uncrosslinked state unmixed and, after closing of the casting mould, are crosslinked together. By suitably controlling the introduction of the different crosslinkable materials with regard to location and/or time the merging of the colours and the transitions between the colours in the contact lens are influenced in a controlled manner. As crosslinkable materials, water- soluble derivatives of PVA that contain a crosslinkable radical are preferably used.
De manière à permettre une fabrication rapide et rationnelle d'articles moulés, en particulier des lentilles de contact, qui sont partiellement colorés ou qui présentent des zones de différentes couleurs, par le procédé de coulage, on introduit dans le moule de coulée (40) des quantités dosées d'au moins deux matières (6, 7) réticulables de couleur différente, à l'état non réticulé et non mélangé et, on les réticule conjointement après avoir fermé le moule de coulée. En modulant de manière appropriée l'introduction des différentes matières réticulables selon le lieu et/ou la durée de l'opération, on module le mélange des couleurs et les transitions entre les couleurs dans la lentille de contact. On utilise de préférence des dérivés hydrosolubles de PVA contenant un radical réticulable comme matière réticulable.
Heinrich Axel
Muller Achim
Seiferling Bernhard
Fetherstonhaugh & Co.
Novartis Ag
LandOfFree
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