| 摘要 |
<p>A photostable UV absorbent with maximum absorption above 340 nm having formula (I), wherein R is -CO(R2) or phenyl optionally substituted with lower alkyl and/or lower alkoxy; R2 is -alkyl, -O(C2+ alkyl), (1) or (2); n has a value of from 2 to 8; S and T each independently are hydroxy, lower alkyl, lower alkoxy or, when R2 is alkyl or alkoxy, S can also be phenyl and when R2 is alkoxy, T is alkoxy, or S + T taken with the phenyl ring form a naphthyl radical or a fused benzodioxol-5-yl heterocyclic radical; k + 1 has a value of from 0 to 3 with the proviso that, when R2 is -O(alkyl), T is -O(lower alkyl) and the value of 1 is 2 or 3; R3 is hydrogen or lower alkylene; R4, R5, and R6 are each independently C1 to C18 alkyl or one of R4, R5 and R6 can be phenyl and A is an anion.</p> |
