Hydrophobic polymer for producing medical devices visible in MRI

A hydrophobic polymer, comprising a monomer unit on which a chelating ligand complexed with a paramagnetic ion is grafted, comprising

• a polymer that is a polyacrylate comprising identical or different monomer units of formula (I):
• wherein:
• R1 represents a (C1-C12)alkyl group or a (C1-C8)cycloalkyl group optionally substituted with a (C1-C4)alkyl group;
• or
• a polymer that is a polyester comprising identical or different monomer units of formula (II):
• wherein:
• R2, R3 and R4 independently represent a hydrogen atom, a (C1-C12) alkyl group or a (C1-C8) cycloalkyl group optionally substituted with a (C1-C12) alkyl group;
• x represents an integer between 0 and 12;
• and
• y represents an integer between 0 and 8,
• such that x and y are not zero simultaneously,
• wherein:
• the chelating ligand is grafted on a carbon atom at the α position of a carbonyl group in formula (I) or formula (II).