Improved polyester polymers

摘要

The disclosure pertains to an intimate molecular mixture of polyester with an effective amount of compound (I)
<Chemistry id="chema01" num="0001"><Image id="ia01" he="17" wi="62" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry> where n=2, 3 or 4 and at least one R<Sup>4</Sup> group represents a sterically hindered amine group adjacent to the carbonyl, and preferably each R<Sup>4</Sup> group is a hindered amino group.

Exemplary R<Sup>4</Sup> groups are according to formulae (α):
<Chemistry id="chema02" num="0002"><Image id="ia02" he="38" wi="164" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry>