PROCESS FOR THE MANUFACTURE OF MOULDED ARTICLES THAT ARE PARTLY COLOURED OR HAVE REGIONS OF DIFFERENT COLOURS

摘要

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.