STABILIZERS FOR CHLORO CONTAINING THERMOPLASTS

摘要

Stabilisers for chlorine-containing thermoplastics Chlorine-containing thermoplastics, containing a pyrrole of the formula I (I) in which R1 is hydrogen, alkyl, cycloalkyl, aryl, alkoxycarbonylmethyl, free or esterified .alpha.-hydroxyalkyl, free or esterified a-hydroxycycloalkylmethyl, free or esterified .alpha.-hydroxyaralkyl, alkoxymethyl, alkylthiomethyl, aryloxymethyl, arylthiomethyl, cycloalkoxymethyl, cycloakylthiomethyl, aralkoxymethyl, aralkylthiomethyl, alkoxy, alkylthio, cycloalkoxy, cycloalkylthio, aralkoxy, arylalkylthio, aryloxy, arylthio, halogen, mercapto, mercaptomethyl or hydroxyl, R2 is hydrogen, alkyl, cycloalkyl, aryl, free or esterified .alpha.-hydroxyalkyl, in which the alkyl moiety together with R1 can be alkylene, or free or esterified .alpha.-hydroxycycloalkylmethyl, free or esterified .alpha.-hydroxyaralkyl, alkoxy, cycloalkoxy, aralkoxy, aryloxy, alkylthio, cycloalkylthio, aralkylthio, arylthio, alkoxymethyl, alkylthiomethyl, aryloxymethyl, arylthiomethyl, cycloalkoxymethyl, cycloalkylthiomethyl, aralkoxymethyl, aralkylthiomethyl, hydroxyl, cyano, free carboxyl or carboxyl in the form of a salt, or acyl, it being possible for acyl together with R1 to be -CO-alkylene, in which -CO- is bonded in the 3-position, or R2 is halogen, mercapto or mercaptomethyl, and R3 is alkyl, cycloalkyl, aralkyl, aryl, free or esterified hydroxymethyl, alkoxymethyl, alkylthiomethyl, cycloalkoxymethyl, cycloalkylthiomethyl, aralkoxymethyl, arylalkylthiomethyl, aryloxymethyl or arylthiomethyl, alkoxy, alkylthio, cycloalkoxy, cycloalkylthio, aralkoxy, aralkylthio, aryloxy, arylthio, halogen, mercapto or mercaptomethyl, or if R2 is carboxyl in the form of a salt, R3 is hydrogen and R1 is as defined, or in which R3 is hydroxyl and R1 is hydrogen, alkyl or aryl and R2 is hydrogen, alkyl, aryl or acyl, or a salt thereof.