The invention relates to biaxially oriented, co-extruded polyester films.
Said films comprise a base layer which consists of at least 70% by weight
of a thermoplastic polyester, preferably polyethylene terephthalate (PET)
with a diethylene glycol and/or polyethylene glycol content greater than
1.3% by weight and have at least one matt outer layer and optionally
additional intermediate layers. The films also contain at least one
UV-absorber, preferably hydroxy benzotriazoles and triazines. The films
are characterized by high UV-stability, no embrittlement after exposure to
temperature, a matt surface devoid of unwanted clouding and excellent
thermoforming properties and are, together with the molded bodies produced
therefrom, suitable for numerous interior and exterior applications. The
(matt) outer layers can be identical or different and contain a mixture or
a blend of a component I which consists of PET homopolymers and/or
copolymers and a component II which is a copolymer resulting from the
condensation product of isophthalic acid, an aliphatic dicarboxylic acid
and a sulfomonomer with a copolymerizable aliphatic or cycloaliphatic
glycol.
