| abstract |
Polycondensates which contain tartaric acid derivatives, processes for their preparation and use thereof. The invention relates to polycondensates which consist of at least 95 mol % of recurring structural units of the formula I <IMAGE> (I) where R1 is a 2,3-O-alkylidenetartaric acid derivative (II) or furo[2,5] (V), alkyl, alkenyl, cycloalkyl, cycloalkenyl, aryl or a heterocycle, X is -O-, -NH- or -S- and R2 is 2,3-O-alkylidene-L-threitol (III) or a compound of the formula VI, alkyl, alkenyl, cycloalkyl, cycloalkenyl, aryl or a heterocycle, with the proviso that more than 5 mol % of the radicals R1 and/or R2 are present in the polycondensate of the formula I, where R1 is compound of the formula II or R2 is a compound of the formula III or R1 is a compound of the formula II and R2 is a compound of the formula III, or in which more than 5 mol % of the radicals R1 and R2 are present in the polycondensate of the formula I, where a) R1 is a compound of the formula V and R2 is a compound of the formula VI, or b) R1 is phenyl[1,2], phenyl[1,3] or phenyl[1,4] and R2 is a compound of the formula VI, to a process for the preparation of these polycondensates, and to their use for the production of depot preparations with controlled release of active substance or for the production of ultrasonic contrast agents. |