Polymers and oligomers of bile acid derivatives, process for their preparation and their use as pharmaceuticals

A polymeric or oligomeric bile acid, prepared by polymerization of a monomeric bile acid of the formula I

• G--X--A (I)
• in which
• G is a free bile acid or its alkali metal salt or a bile acid having rings A, B, C, D esterified on ring D and which is bonded via its ring A, B or C, to the group X,
• X is a bridge group and
• A is a polymerizable, ethylenically unsaturated group, or by copolymerization with a monomer containing a polymerizable, ethylenically unsaturated double bond,
• or by copolymerization with N-vinylpyrrolidone or its derivatives,
• and/or by copolymerization with ethylenically unsaturated dicarboxylic anhydrides and ethylenically unsaturated dicarboxylic acids each having 2 to 6 carbon atoms;
• their esters or half esters, esters being understood as alkyl esters having 1-6 carbon atoms, cycloalkyl esters having 5 to 8 carbon atoms, benzyl esters or phenyl esters.