| abstract |
A process is disclosed for producing a photosensitive object that consists of a polymer and contains at least one spirooxazin compound. The process has the following steps: an acrylate monomer or a methacrylate monomer or a mixture of several such monomers is used as polymerisable monomer; the photosensitive dyestuffs and a polymerisation initiator are mixed with the polymerisable monomer; the thus obtained mixture is introduced into a casting mould, polymerised and hardened. The invention is characterised in that several photosensitive dyestuffs, of which at least one is not a spirooxazin, are added in order to obtain a polymerisable mixture having a neutral grey, neutral brown or green photosensitive coloration; in that the concentration of spirooxazin compounds does not exceed 0.045 % by weight, in relation to the mass of the monomer used; and in that the polymerisation initiators amount to more than 1 % by weight, in relation to the mass of the monomer used. |