Plasticizer composition containing polymeric dicarboxylic acid esters and terephthalic acid dialkyl esters

A plasticizer composition comprising

• a) at least one compound of the general formula (I),
• in which
• X independently at each occurrence is an unbranched or branched C2-C8 alkylene group or an unbranched or branched C2-C8 alkenylene group, comprising at least one double bond,
• Y is an unbranched or branched C2-C12 alkylene group or an unbranched or branched C2-C12 alkenylene group, comprising at least one double bond,
• a is an integer from 2 to 50,
• and
• R1 independently at each occurrence is selected from unbranched or branched C4-C12 alkyl radicals,
• where the groups X present in the compounds (I) can have the same or different definitions and where the groups Y present in the compounds (I) are the same,
• and
• b) at least one compound of the general formula (II),
• in which
• R2 and R3 independently of one another are selected from branched and unbranched C4-C12 alkyl radicals.