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Die Angewandte Makromolekulare Chemie 137 (198s) 249-260 (221 6) Forschungsinstitut der Chemischen Technologie Dimitrovova 3 4 , 036 03 Bratislava, CSSR WIRKSAMKEIT STERISCH GEHINDERTER AMINE BE1 ANSPRUCHSVOLLEN APPLIKATIONEN VON POLYPROPYLEN 5au;i.k Pavol, Povaiancov& Marta, Durmis Jfilius, Karvaz Milan SUMMARYThe influence of some types of antioxidants on the efficiency of low molecular hindered amine light stabilizers (HALS) has been investigated in a comparison with t h e behaving of high molecular HALS. Most of the antioxidants used exhibit favourable influence. Convenience of both low and high molecular HALS in compounds depends on the character of the stabilised product and the technological conditions for its production. EINLEITUNGHohe Anforderungen auf Lichtstabilitat bestehen insbesondere bei Produkten mit gro5er spezifischer Oberflache, wie z.B. bei Folien, Bandern und Fasern. Diese Produkte sind bei der Produktion und Verarbeitung oft auBerst anspruchsvollen Bedingungenhauptsachlich erhohten Temperaturenausgesetzt. Von Stabilisierungssystemen fur eine solche Anwendung wird verlangt, da5 sie das Polymere wahrend der Verarbeitung schutzen und eine groBstmogliche Lichtstabilitat des Endproduktes garantieren. Lichtschutzmittel der Gruppe sterisch gehinderter Amine (HALS) zeichnen sich neben hervorragender Lichtschutzwirkung auch durch Schutz

STABILIZATION OF POLYPROPYLENE BY ESTERS OF 2,2,6,6 -TETRAMETHYL 4 -PIPER ID I NOL E ai4arta Povaiancov5, aPeter Danko, aMilan Karva5, bMarta Klimov6, 'Pavol ZauEik, 'Jtilius Our:tlisThe eifcct of the sabstituznts R and X in esters of 2,2,6,5-tetra-methy<.-! -piperidinole of t i i s general formula 1 (311 tha,r stabilizing efficien-y in polypropylene was investigated. As the subslituents R , the aliphatic alkyls CH3(CH2),, were used, whc?re 11=0-15, X=H. !3y thc derivative where R is an alkyl with 1 3 t~ 17 carbon aioms the sffect of the substituent X was also investigated where X is ti, O', OH, OR.' Both the thermooxidation and photooxidation stability of PP uers found to be increased with the insrcasing chain length R. The effect of the substituents X is various. Both ;NO' and ZN-Oii stabilizers have high efficiency during the processing of PP. At the long-term thermooxidation stress, the IN-OR,' 74-0' and -N -O H derivatives are more efficient than,;N-H compounds which are the most efficient against the effect of the ultraviolet radiation and photooxidation.

Stability of systems can be influenced by processing conditions. Extent of influence is dependend not merely upon processing conditions, but also used stabiliser formulations. There were investigated the systems, which contained as a photostabiliser varioushindered amine compounds and 2-hydroxy-4octyloxybenzophenone. There was investigated the effect on photostability in accelerating aging in Xenotest 450/uptake of carbonyls/. From results can be concluded that hindered amines much better protect polyolefines even after processing at higher temperatures than commercialy known UV-absorber-2hydroxy-4-octyloxybenzophenone.Vortrag anlBBlich des 1 4 . DonaulBndergesprBchs iiber "Natiirliche und kiinstliche Alterung von Kunststoffen" in Slantchev Brijag, Bulgarien, vom 7 . bis 9. Oktober 1 9 8 1