| 摘要 |
beta -Ketoesters derived from alcohols or polyols, which are natural product or can be obtained from natural products by fermentation processes and optional subsequent oxidation or reduction, are suitable for stabilising polymers, The ketoesters are represented by formula 1: AÄ(O-CHR<4>-Z-CHR<5>)m-O-CO-CR<1>R<2>-CO-R<3>Ün 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, C1-C8 alkyl, C3-C8 alkenyl or cycloalkyl(alkyl) or C6-C8 aryl or aralkyl; R<2> is hydrogen, C1-C8 alkyl or C3-C8 alkenyl; R<3> is C1-C18 alkyl, alkoxy or alkylamino, C3-C18 alkenyl, alkanoylmethyl, alkoxycarbonylmethyl or cycloalkyl(alkyl), C6-C18 aryl, aryloxy, arylamino, aralkyl, aralkoxy or aralkylamino, or C8-C18 aroylmethyl, aryloxycarbonylmethyl or arylcarbamoylmethyl; R<4> and R<5> are independently hydrogen or methyl; and Z is a direct bond, CH2, CHOH or CH-O-CO-CR<1>R<2>-CO-R<3>. |
