Patent ID: 7820865

Claim:
A photolatent compound of the formula I wherein R 1 and R 2 are each independently of the other C 1 -C 10 alkyl or C 3 -C 8 cycloalkyl, R 3 is hydrogen or C 1 -C 4 alkyl, and R 4 is unsubstituted C 1 -C 25 alkyl, C 3 -C 25 alkenyl, C 3 -C 25 alkinyl, C 6 -C 10 aryl, C 3 -C 12 cycloalkyl or C 3 -C 12 cycloalkenyl; or is C 1 -C 25 alkyl, C 3 -C 25 alkenyl, C 3 -C 25 alkinyl, C 6 -C 10 aryl, C 3 -C 12 cycloalkyl or C 3 -C 12 cycloalkenyl substituted with C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 3 -C 18 alkinyl, C 3 -C 12 cycloalkyl, C 1 -C 18 alkoxy, hydroxyl, C 2 -C 18 alkoxycarbonyl, formyl, C 1 -C 18 alkylthio, C 1 -C 18 alkylsulfinyl, C 1 -C 18 alkylsulfonyl, halogen, carboxy, C 2 -C 18 carboxyalkyl, C 2 -C 18 carboxyalkoxy, C 3 -C 18 -alkoxycarbonylalkyl, C 3 -C 18 -alkoxycarbonylalkoxy, C 7 -C 9 phenylalkyl, phenoxy, halogen substituted phenoxy, sorbityl or R 5 is hydrogen, C 1 -C 4 alkyl or halogen, and R 6 and R 7 independently of each other are phenyl or C 1 -C 4 alkyl substituted phenyl; and with the proviso that, when R 1 and R 2 are tert-butyl and R 3 is hydrogen, R 4 is not methyl or phenyl.