| abstract |
Thermoplastic copolyetherester elastomers are stabilized against heat and light aging by incorporating into the , copolyetherester effective concentrations of a phenolic antioxidant and a hindered amine photostabilizer of the formulan where R is hydrogen or an alkyl radical of 1-12 carbon atoms, R 2 and R 3 are alkyl radicals of 1-12 carbon atoms, benzyl, or 3,5-di-tert-butyl-4-hydroxybenzyl. |