The Invention relates to novel ketones of formulae (I) and (II) wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are, for example, C.sub.1-C.sub.8alkyl, R.sub.5 is, for example, hydrogen, A is CI, Br, -0-R.sub.7, --NR.sub.8R.sub.9 or --S--R.sub.16, A' is --O--, --NH-- or --NR.sub.8--, X and Y are each independently of the other --O--R.sub.10 or --N(R.sub.11)(R.sub.12), n is an integer from 1 to 10, R.sub.6 is, for example, an n-valent radical of linear or branched C.sub.2-C.sub.20alkyl the carbon chain of which may be interrupted by cyclohexanediyl, phenylene, --CH(OH)--, --C(C.sub.2H.sub.5)(CH.sub.2--CH.sub.2--OH)--, --C(CH.sub.3)(CH.sub.2--CH.sub.2--OH)--, --C(CH.sub.2--CH.sub.2--OH).sub.2--, --N(CH.sub.3)--, --N(C.sub.2H.sub.5)--, --N(CH.sub.2--CH.sub.2--OH)--, --CO--O--, --O--CO--, --P(CH.sub.2--CH.sub.2--OH)--, --P(O)(CH.sub.2--CH.sub.2--OH)--, -0-P(O--CH.sub.2--CH.sub.2--OH)--O--, -0-P(O)(0-CH.sub.2--CH.sub.2--OH)--O--, --O-cyclohexanediyl-C(CH.sub.3).sub.2-Cyclohexanediyl-O--, --O-phenylene-C(CH.sub.3).sub.2-phenylene-O--, --O-phenylene-CH.sub.2-phenylene-O--, --Si(CH.sub.3).sub.2--, -0-Si(CH.sub.3).sub.2--O--, --O--Si(CH.sub.3)(0-CH.sub.3)--O--, --Si(CH.sub.3)(R.sub.17)--O--Si(CH.sub.3)(R.sub.18)--, 5-(2-hydroxyethyl)-[1,3,5]triazinane-2,4,6-trione-1,3-diyl and/or by from one to nine oxygen atoms. ##STR00001##