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