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Abstract

Polyesters are disclosed containing at least 0.1 mol % of the structural repeat units of the formula I and optionally up to 99.9 mol % of the structural repeat units of the formula II --O--OC--Ar.sup.1 --CO--O--R.sup.1 -- (I) --O--OC--Ar.sup.2 --CO--O--R.sup.2 -- (II) where Ar.sup.1 is a radical of the formula III and/or of the formula IV and/or of the formula V ##STR1## Ar.sup.2 is a bivalent mono- or polycyclic aromatic radical which differs from the radicals of the formulae III, IV and V, R.sup.1 and R.sup.2 are independently of each other a bivalent cycloaliphatic radical derived from cyclohexanedimethanol, a radical of the formula --.sub.n H.sub.2n -- and/or a radical of the formula --?C.sub.m H.sub.2m --O--!.sub.x --C.sub.m H.sub.2m --, where n is an integer between 2 and 10, m is an integer between 2 and 10, and x is an integer from 1 to 20, Y is a direct C--C bond, --NR.sup.3 --, --S-- or --O--, Z is a direct C--C bond or a bridging group --O--, --C.sub.q H.sub.2q --, --S--, --CO-- or --SO.sub.2 --, q is an integer from 1 to 10, R.sup.3 is a univalent aliphatic, cycloaliphatic, aromatic or araliphatic radical, preferably methyl, R.sup.4 is a radical of the formula --C.sub.o H.sub.2o+1 and/or a radical of the formula --?C.sub.p H.sub.2p --O--!.sub.z --R.sup.5, R.sup.5 is a univalent aliphatic, cycloaliphatic, aromatic or araliphatic radical, preferably methyl, o is an integer from 6 to 30, p is an integer from 2 to 10, y is an integer from 1 to 4, and z is an integer from 1 to 10. The polyesters are notable for a low viscosity and are advantageous to process into shaped structures.

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