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New Combined Phenol-hindered Amine Stabilizers for Polymers Based on Diphenylmethane-4,4′-diisocyanate and Dicyclohexylmethane-4,4′-diisocyanate by Cs. Kósa; Š. Chmela; G. Theumer; W.D. Habicher is a Materials Science article available to read on EtoBox.

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New higher molecular weight combined photo-stabilizers for polymers were synthesized, based on sterically hindered phenols and sterically hindered amines (HAS). The coupling of different phenols as well as different HAS was done by reaction with diphenylmethane-4,4#-diisocyanate (MDI) and dicyclohexylmethane-4,4#-diisocyanate (CDI). 2,2,6,6-Tetramethyl-4-piperidinol (TMP), 1,2,2,6,6-penta-methyl-4-piperidinol (PMP), 4-amino-2,2,6,6-tetramethylpiperidine (ATP) and 4-N-butylamino-2,2,6, 6-tetramethylpiperidine (BATP) were used as starting HAS. Two phenols 2,6-di-tert.-butylphenol (PhI) and 2,6-di-tert.-butyl-4-methylphenol (PhIV) were mainly combined with HAS. To check the advantage of the combination of phenol and HAS in one molecule the symmetrical HASeHAS as well as phenolephenol stabilizers using CDI as a linker were also synthesized. Photostabilizing effects have been investigated in PP films. Combined phenoleHAS additives prepared from dicyclohexylmethane-4, 4#-diisocyanate were much more efficient than the similar derivatives of diphenylmethane-4,4#-diisocyanate. Binding of phenol and HAS in combined molecules increased their efficiency in comparison with the efficiency of the

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Author

Cs. Kósa; Š. Chmela; G. Theumer; W.D. Habicher

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0141-3910)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)