Hydrogel compositions

A crosslinked composition able to form a hydrogel polymer, resulting from the crosslinking:

• A) at least one polymerizable monomer or mixture of polymerizable monomers or a mixture of monomers and polymerizable macromonomers bearing at least one polymerizable C═C function of the acrylate, methacrylate, maleate, fumarate, itaconate, citraconate, styrenic or vinylic type;
• B) at least one polyol selected from oligoglycerols, linear, branched and hyperbranched polyglycerols or a mixture of hyperbranched polyglycerol and of a polyol selected from oligoglycerols and linear, branched and hyperbranched polyglycerols, comprising on average more than 1 hydroxyl group functionalized with a group bearing a polymerizable C═C function of the acrylate, methacrylate, maleate, fumarate, itaconate, citraconate, styrenic or vinylic type;
• C) a radical initiator or a mixture of radical initiators capable of initiating polymerization by thermal, redox or photochemical routes;
• and
• D) optionally at least one additive selected from antioxidants, agents for adjusting the physicochemical properties such as Young's modulus, elongation at break and breaking stress, agents for promoting, modulating and/or controlling permeability to oxygen, plasticizers, moistening agents, lubricants, viscosity lowering agents, compatibilizers, colorants, filtering agents, antimicrobial agents, therapeutic agents and agents against bacterial biofilms.