Patent ID: 8049186

Claim:
Composition showing a color change depending on the absorbed radiation-dose, comprising (a) an acid responsive colorant; wherein the acid responsive colorant is selected from the group consisting of spiro-pyrans, spiro-oxazines, naphthopyrans and lactones; and (b) a photolatent acid; wherein the photolatent acid is a sulfonyloxime ester compound of the formula IIa or IIc R 20 is (CO)O—C 1 -C 20 alkyl, CN or C 1 -C 20 haloalkyl; R 21 has one of the definitions given for R 20 or is R 22 is C 1 -C 20 alkyl, C 1 -C 20 haloalkyl, camphoryl, phenyl-C 1 -C 6 alkyl, C 3 -C 30 cycloalkyl, phenyl, naphthyl, anthryl or phenanthryl, the groups cycloalkyl, phenyl, naphthyl, anthracyl and phenanthryl being unsubstituted or substituted by one or more halogen, C 1 -C 12 haloalkyl, CN, NO 2 , C 1 -C 20 alkyl, phenyl, C 1 -C 12 alkylthio, C 1 -C 12 alkoxy, phenoxy, C 1 -C 12 alkyl-O(CO)—, C 1 -C 12 alkyl-(CO)O—, R 24 OSO 2 — and/or —NR 25 R 26 ; u is 0 or 1; v is 3; R 23 is C 1 -C 20 alkyl, cyclopentyl, cyclohexyl, camphoryl, unsubstituted phenyl, or phenyl substituted by one or more halogen, C 1 -C 12 alkyl, OR 27 , SR 27 or NR 25 R 26 ; R 24 is hydrogen, C 1 -C 20 alkyl, phenyl or phenyl substituted by C 1 -C 20 alkyl; R 25 and R 26 are each independently of the other hydrogen, C 1 -C 20 alkyl, C 2 -C 12 hydroxyalkyl, or R 25 and R 26 , together with the N atom to which they are bonded, form a 5- or 6-membered ring, which optionally contains one or more O or NR 28 ; R 27 is C 1 -C 20 alkyl, phenyl, phenyl-C 1 -C 6 alkyl or C 2 -C 12 hydroxyalkyl; and R 28 is hydrogen, phenyl, phenyl-C 1 -C 6 alkyl, C 1 -C 20 alkyl or C 2 -C 12 hydroxyalkyl.