{HEAD ~ The invention} relates to compounds of the formulae:processes for their preparation, polymers, co polymers or block co polymers containing them or {TAIL ~ their use} as monomers or co monomers in free radical polymerisation and in the manufacture of adhesives, dental composites or optical lenses 
{ HEAD ~ The invention } relates to compounds of the formulae : processes for their preparation , polymers , co polymers or block co polymers containing them or { TAIL ~ their use } as monomers or co monomers in free radical polymerisation and in the manufacture of adhesives , dental composites or optical lenses
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