| 摘要 |
beta-Ketoesters and their enamines derived from alcohols or polyols, especially sugar alcohols and their anhydro derivatives, which are natural products or can be obtained from natural products by fermentation processes and optional subsequent oxidation or reduction, are suitable for stabilising polymers. The ketoesters and enamines are represented by formulae (1) and (2) respectively: A[(O-CHR 4 -Z-CHR 5) m -O-CO-CHR 1 -CO-R 3 ] n and A[(O-CHR 4 -Z-CHR 5) m -O-CO-CR 1 =C(-NHR 2)-R 3 ] n, wherein: A is the residue of an alcohol or polyol selected from hydroxyalkanoic acid esters, sugars and their glycosides, sugar alcohols, sugar acids and their esters, and oligosaccharides; m is an integer number from 0 up to 6; n is a number from 1 up to the total number of hydroxyl groups in the polyol; R 1 is hydrogen, C 1 -C 8 alkyl, C 3 -C 8 alkenyl or cycloalkyl(alkyl) or C 6 -C 8 aryl or aralkyl; R 2 is hydrogen, C 1 -C 6 alkyl, C 2 -C 6 hydroxyalkyl or C 3 -C 6 alkenyl; R 3 is C 1 -C 18 alkyl, alkoxy or alkylamino, C 3 -C 18 alkenyl, alkanoylmethyl, alkoxycarbonylmethyl or cycloalkyl(alkyl), C 6 -C 18 aryl, aryloxy, arylamino, aralkyl, aralkoxy or aralkylamino, or C 8 -C 18 aroylmethyl, aryloxycarbonylmethyl or arylcarbamoylmethyl; R 4 and R 5 are independently hydrogen or methyl; and Z is a direct bond, CH 2, CHOH, CH-O-CO-CHR 1 -CO-R 3 or O-CO-CR 1 =C(-NHR 2)-R 3. |
