| abstract |
Polyesters having an acid number of less than 3 mg KOH / g, which are derived from: I. Has an aromatic component with four carboxyl groups or an anhydride thereof and optionally B one or more components having from 2 to 12 groups carboxylic, preferably from 2 to 4, or alternatively from 1 to 6 carboxylic anhydride groups, preferably 1 or 2, components which are chosen from the following: B1 a C2 to C16 aliphatic carboxylic acid; B2 a non-aromatic C7 to C16 cyclic carboxylic acid; and B3 an aromatic C8 to C16 carboxylic acid; II. optionally C one or more aliphatic, cycloaliphatic or aromatic, but preferably aliphatic, polyhydric components having 2 to 8 hydroxyls, preferably 2 to 4; and III. D an alkylene oxide. These polyesters suppress the release of toxic fumes and gases during the combustion of polyurethanes. |