Patent ID: 6355713
Filing Date: 2002-03-12
Classification: C07C,C08K

Abstract:
A process for stabilising thermoplastic polymers, comprising incorporating into a polymer-producing mixture a &bgr;-ketoester or the corresponding &bgr;-enamine represented by formulae 1 and 2, respectively:A[(Oâ€”CHR4â€”Zâ€”CHR5)mâ€”Oâ€”COâ€”CHR1â€”COâ€”R3]nâ€ƒâ€ƒ1 A[(Oâ€”CHR4â€”Zâ€”CHR5)mâ€”Oâ€”COâ€”CR1&boxH;C(â€”NHR2)â€”R3]nâ€ƒâ€ƒ2 wherein:A is the residue of an alcohol or polyol selected from hydroxyalkanoic acid esters, sugars and their glycosides, sugar alcohols and their dehydration products, 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; R1 is hydrogen, C1-C8 alkyl, C3-C8 alkenyl or cycloalkyl(alkyl) or C6-C8 aryl or aralkyl; R2 is hydrogen, C1-C6 alkyl, C2-C6 hydroxyalkyl or C3-C6 alkenyl; R3 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; R4 and R5 are independently hydrogen or methyl; and Z is a direct bond, CH2, CHOH, CHâ€”Oâ€”COâ€”CHR1â€”COâ€”R3 or CHâ€”Oâ€”COâ€”CH&boxH;C(NHR2)â€”R3.