| abstract |
Polyester, obtainable by reacting an anhydride of a tetracarboxylic acid of the formula (1), wherein X, independently of each other, is a bond, oxygen, sulfur, an alkylene group or a carbonyl group and wherein m is an integer greater than or equal to 0, with a triol of the formula (2), wherein R and R '', each independently, are hydrogen or an alkyl group of 1 to 4 carbon atoms, and n is an integer greater than 2 and optionally with at least one further di- or polyol. |