Patent ID: 8268293

Claim:
A method of achieving UV-A or UV-B protection comprising employing compounds which do not themselves exhibit significant UV absorption in the UV-A or UV-B region, but are reactive under use conditions, for the development of UV-A or UV-B protection during use wherein said compounds are compounds of the formula I where Ar stands for an unsubstituted or mono- or polysubstituted aromatic ring or condensed ring systems having 6 to 18 C atoms, at least one ring of which has an aromatic character and in which one or two CH groups per ring may be replaced by C═O, N, O or S and, in addition, one or two CH 2 groups in a condensed ring system may be replaced by C═O or C═CH 2 , R 1 stands for H or a branched or unbranched C 1-30 -alkyl or C 1-30 -hydroxyalkyl radical or a radical R a or R b where m stands for an integer from the range from 1 to 30, and A 1 -A 3 each, independently of one another, stand for a benzyl radical or a —(CH 2 O) n (CH 2 ) o (O) p H radical, where m and o each, independently of one another, stand for an integer from the range from 0 to 30, and p stands for 0 or 1, X stands for a group selected from —H, —CN, —C(═O)—R 1 and —C(═O)—Z 2 —R 1 , Y stands for H or Ar, Z 1 and Z 2 each, independently of one another, stand for O, S, CR 7 R 8 , NR 7 or a single bond, R 7 and R 8 are each, independently of one another, selected from H, OH, straight-chain or branched C 1 - to C 20 -alkoxy groups, straight-chain or branched C 1 - to C 20 -alkyl groups, straight-chain or branched C 3 - to C 20 -alkenyl groups, straight-chain or branched C 1 - to C 20 -hydroxyalkyl groups, where the hydroxyl group may be bonded to a primary or secondary carbon atom of the chain and furthermore the alkyl chain may also be interrupted by oxygen, straight-chain or branched C 1 - to C 20 -hydroxyalkoxy groups, where the hydroxyl group(s) may be bonded to a primary or secondary carbon atom of the chain and furthermore the alkyl chain may also be interrupted by oxygen, or salts of the compounds of the formula I.