| http://www.w3.org/ns/prov#value | - The dihydroxy compounds (a2) employed according to the invention are selected from the group consisting of C2-C6-alkanediols and C5-C10-cycloalkanediols, such as ethylene glycol, 1,2- and 1,3-propanediol, 1,2- and 1,4-butanediol, 1,5-pentanediol or 1,6-hexanediol, in particular ethylene glycol, 1,3-propanediol and 1,4-butanediol, cyclopentanediol, cyclohexanediol, 1,2-cyclohexanedimethanol, 1,4-cy
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