| 摘要 |
TITLE STABILIZED POLYACETAL COMPOSITIONS Incorporation of at least one hindered amine light stabilizer ("HALS") compound having a hindered phenol group and a piperidine ring or oxo-piperazinyl ring, provided that each such ring has a hindered amine, at the N4 position in the ring, that is of tertiary functionality, into polyacetal homopolymer compositions improves the W stability, and does not significantly degrade the melt processing thermal stability, of said composition. Incorporation of (a) a HALS compound having an s-triazine group, along with a piperidine ring or an oxo-piperazinyl ring, (provided each such ring has a hindered amine at the N4 position in the ring), and (b) a HALS as described in the preceding paragraph into polyacetal polymer compositions improves the W stability, and does not significantly degrade the thermal stability of said composition. The composition of the present invention are useful in polyacetal applications where enhanced UV stability is desired. AD-5965
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