Aromatic-aliphatic ketones useful as photoinitiators

DETAILED DESCRIPTION What is claimed is: 1.
A compound of the formula ##STR13## wherein A is --CO-- or --CO--CO--; X is --OR.
sup.
5 ; Z is --S--, or --O--; m is O or an integer of 1 to 3; n is O or an integer of 1 to 3; R.
sup.
1 is alkyl of 1-12 C atoms, cycloalkyl of 5-6 C atoms, aryl of 6-14 C atoms, aralkyl of 7-9 C atoms, --OH, --OAlk, --OAr, --SAlk, --SCH.
sub.
2 CH.
sub.
2 OH, --SAr, --SO.
sub.
2 Alk, --SO.
sub.
2 phenyl, --SO.
sub.
2 NH.
sub.
2, --SO.
sub.
2 NHAlk, --SO.
sub.
2 N(Alk).
sub.
2, --COOAlk, --NH.
sub.
2, --NHAlk, --N(Alk).
sub.
2, --NHCOphenyl, --CN or halogen; R.
sup.
2 can be any of the groups defined for R.
sup.
1 or another --CO--CR.
sup.
3 R.
sup.
4 X group; R.
sup.
3 is H, alkyl of 1-8 C atoms, or alkyl of 1-8 C atoms substituted by --OH, --OAlk, acyloxy of 2-8 C atoms, --NR.
sup.
8 R.
sup.
9, --COOAlk or --CN, or is alkenyl of 3-5 C atoms; R.
sup.
4 can be any of the groups defined for R.
sup.
3 or --CH.
sub.
2 CH.
sub.
2 R.
sup.
13 ; R.
sup.
5 is H, alkyl of 1-12 C atoms or alkyl of 1-8 C atoms substituted by --Cl, --Br, --OH, --OAlk, --SAlk, acyloxy of 2-8 C atoms, --COOAlk, --CONHAlk, --CON(Alk).
sub.
2 or --CN, or is alkenyl of 3-5 C atoms, or cyclohexyl; R.
sup.
8 is alkyl of 1-12 C atoms, or alkyl of 2-4 C atoms substituted by --OH, --OAlk or --CN, or is alkenyl of 3-5 C atoms, or cyclohexyl; R.
sup.
9 is alkyl of 1-12 C atoms, or alkyl of 2-4 C atoms substituted by --OH, --OAlk or --CN, or is alkenyl of 3-5 C atoms, or cyclohexyl, or, together with R.
sup.
8, is alkylene of 4-5 C atoms or C.
sub.
4-5 -alkylene interrupted by --O-- or --NR.
sup.
14 --, or, together with R.
sup.
4, is alkylene of 1-9 C atoms, oxa- or aza-alkylene of 2-3 C atoms; R.
sup.
13 is --CONH.
sub.
2, --CONHAlk, or --CON(Alk).
sub.
2 ; R.
sup.
14 is alkyl of 1-4 C atoms; Alk is alkyl of 1-4 C atoms; and Ar is C.
sub.
6-14 aryl or aryl substituted by alkyl groups and having a total of 6-14 C atoms; wherein aryl stands for hydrocarbon aryl groups and acyl groups are derived from hydrocarbon carboxylic acids.
2.
A compound of claim 1 wherein A is --CO-- or --CO--CO--; X is --OR