Stabilizer system for stabilizing pvc

A stabilizer mixture for stabilizing chlorine-containing polymers, comprising at least

• a) one alkanolamine of the following formula (I), and
• b) one uracil of the following formula (II),
• wherein, for the alkanolamine of the formula (I)
• x=1,2or3;
• y=1,2,3,4,5or6;
• n=from 1 to 10;
• R1 and R2=independently of one another H, C1-C22-alkyl, —[—(CHR3a)y—CHR3b—O—]n—H, —[—(CHR3a)y—CHR3b—O—]n—CO—R4, C2-C20-alkenyl, C2-C18-acyl, C4-C8-cyclo-alkyl, where this may have OH substitution in the β-position, C6-C10-aryl, C7-C10-alkaryl or C7-C10-aralkyl, or, if x=1, R1 and R2 may also, together with the N, form a closed ring having from 4 to 10 members, composed of carbon atoms and, where appropriate, of up to 2 heteroatoms, or if x=2, R1 may also be C2-C18-alkylene which, at both β-carbon atoms, may have OH substitution and/or have interruption by one or more O atoms and/or by one or more NR2 groups, or be dihydroxy-substituted tetrahydrodicyclopentadienylene, dihydroxy-substituted ethylcyclohexanylene, dihydroxy-substituted 4,4′-(bisphenol A dipropyl ether)ylene, isophoronylene, dimethylcyclohexanylene, dicyclohexylmethanylene or 3,3′-dimethyldicyclohexylmethanylene, and if x=3, R1 may also be trihydroxy-substituted (tri-N-propyl isocyanurate)triyl;
• R3a and R3b=independently of one another C1-C22-alkyl, C2-C6-alkenyl, C6-C10-aryl, H or CH2—X—R5, where X═O, S, —O—CO— or —CO—O—;
• R4═C1-C18-alkyl/alkenyl or phenyl;
• and
• R5═H, C1-C22-alkyl, C2-C22-alkenyl or C6-C10-aryl;
• and for the uracil of the formula (II)
• R1 and R2, independently of one another, are C1-C24-alkyl, which may have interruption by —CO2— and/or by 1 or more oxygen atoms, and/or may have substitution by one or more OH groups, or are C3-C24-alkenyl, branched or unbranched, or are C5-C8-cycloalkyl, unsubstituted or substituted with from 1 to 3 C1-C4-alkyl, C1-C4-alkoxy, or C5-C8-cycloalkyl groups, or with hydroxy groups, or with C, atoms, or are C7-C9-phenylalkyl, unsubstituted or substituted on the phenyl ring with from 1 to 3 C1-C4-alkyl, C1-C4-alkoxy, or C5-C8-cycloalkyl groups, or with hydroxy groups, or with Cl atoms, and R1 or R2 may also be hydrogen, and Y is S or O.