Synthesis and polymerisation of new multifunctional urethane methacrylates

New multifunctional urethane methacrylates were synthesised by addition of methacrylates containing a hydroxy group, such as 2-hydroxyethyl methacryla te, 2-hydroxypropyl methacrylate or glycerol dimethacrylate, to alpha,alpha ,alpha',alpha'-tetramethyl-m-xylylene diisocyanate. The structure of the ne w monomers was confirmed by IR, H-1 NMR and C-13 NMR spectroscopy. The phot opolymerisation of the crosslinking monomers in bulk using camphorquinone a s photoinitiator results in transparent, crosslinked polymers.