Process for manufacturing a polymeric preform, such as a preform of polymeric optical fibres, preform obtained by this process and use of this preform for producing polymeric optical fibres

摘要

The present invention relates to a process for manufacturing a polymeric preform comprising a core and a cladding surrounding the core, such as a preform for polymeric optical fibres, which comprises a step for producing the core and a step for producing the cladding, the step for producing the core comprising the bulk polymerisation of a polymerisable mixture of the core polymer, characterised in that, during the said polymerisation, the mass undergoing reaction is subjected to a treatment for compensating for the shrinkage phenomenon due to the polymerisation in order to obtain a homogeneous core. It also relates to the preform obtained by this process.