High polymers containing nicotinic acid, process for their preparation and their use

Polymers having a molecular weight between 1,000 and 1,500,000 characterized in that they contain radicals of nicotinic acid bound to a polyvinylic macromolecular structure through hydroxyalkyl or aminoalkyl chains grafted thereon, with which it forms covalent bonds that are gradually hydrolized in biological environment by setting free nicotinic acid and non-toxic polymer residues, wherein the nicotinic acid radicals are bound to the chains grafted onto the macromolecular structure by means of amide or ester bonds, and wherein the polyvinylic macromolecular structure comprises polyacrylamide, poly-methacrylamide, poly-acrylic acid or poly-methacrylic acid.