| 摘要 |
The invention relates to a composition, comprising a) a styrene, alpha -methylstyrene or p-methylstyrene homo- or copolymer; b) a bromine-containing flame retardant; c) a UV absorber; d) a sterically hindered amine and e) an epoxidised fatty acid. This invention also relates to the use of the light stabiliser mixture consisting of the components c), d), and e) for light-stabilising a styrene, alpha -methylstyrene or p-methylstyrene homo- or copolymer finished with a bromine-containing flame retardant as well as to a process for the light-stabilisation thereof. Adding an epoxidised fatty acid to a UV absorber and a sterically hindered amine in styrene, alpha -methylstyrene or p-methylstyrene homo- or copolymers finished with bromine-containing flame retardants results in an unexpected synergistic effect in the light stability. In particular, it is possible to markedly reduce the discoloration of the finished polymer which takes place in the course of irradiation. |
