Photosensitive hydroxyalkylphenones
AssigneeMerck Patent GmbH
InventorsJuergen Gehlhaus, Manfred Kieser
Life of this patent
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Abstract
Compounds of the formula ##STR1## wherein R.sub.1 is hydrogen, chlorine, phenyl, dialkylamino of 2-4 carbon atoms or alkyl or alkoxy each of up to 18 carbon atoms; R.sub.2 is hydrogen, chlorine, bromine or alkyl or alkoxy each of up to 4 carbon atoms; R.sub.3 and R.sub.4, which can be the same or different, each is hydrogen or alkyl of up to 6 carbon atoms; R.sub.5 is hydrogen or alkyl or alkanoyl each of up to 4 carbon atoms; and R.sub.6 is hydrogen or methyl, with the proviso that not all of R.sub.1 to R.sub.6 simultaneously are hydrogen, are effective photosensitizers, especially for photopolymerization of unsaturated compounds and for hardening of printing dyes.
Claims10
A compound of the formula ##STR13## wherein R.sub.1 is hydrogen, phenyl, dialkylamino of 2-4 C-atoms or alkyl or alkoxy each of up to 18 C-atoms;
- R.sub.2 is hydrogen, chlorine, bromine or alkyl of up to 4 C-atoms;
- R.sub.3 and R.sub.4 are the same or different and each is alkyl of up to 6 C-atoms;
- and R.sub.5 is hydrogen, or alkyl or alkanoyl each of up to 4 C-atoms;
- with the proviso that
- (a) if R.sub.1 and R.sub.2 are both hydrogen and R.sub.3 and R.sub.4 are both methyl:
- R.sub.5 is not hydrogen, methyl or acetyl;
- (b) if R.sub.2 and R.sub.5 are both hydrogen and R.sub.3 and R.sub.4 are both methyl:
- R.sub.1 is not methyl, methoxy or phenyl;
- (c) If R.sub.2 is 2-methyl and R.sub.1 and R.sub.5 are both hydrogen:
- at least one of R.sub.3 and R.sub.4 is different from methyl;
- (d) if R.sub.1,R.sub.2 and R.sub.5 are hydrogen and R.sub.4 is ethyl:
- R.sub.3 is neither methyl nor ethyl.
A compound of the formula ##STR14## wherein R.sub.1 is hydrogen, phenyl, dialkylamino of 2-4 C-atoms;
- or alkyl or alkoxy each of up to 18 C-atoms;
- R.sub.2 is hydrogen, chlorine, bromine or alkyl of up to 4 C-atoms;
- R.sub.3 and R.sub.4 are the same or different and each is alkyl of up to 6 C-atoms;
- and R.sub.5 is hydrogen, or alkyl or alkanoyl each of up to 4 C-atoms;
- with the proviso (a) that R.sub.1 and R.sub.2 are not simultaneously hydrogen atoms;
- (b) that R.sub.1 is not methyl, methoxy or phenyl when (i) R.sub.2 is hydrogen and (ii) R.sub.3 and R.sub.4 are both methyl or one is hydrogen and the other is methyl;
- and (c) that R.sub.2 is not methyl when (i) R.sub.1 is hydrogen and (ii) R.sub.3 and R.sub.4 are both methyl.
A compound of the formula ##STR15## wherein R.sub.1 is hydrogen;
- R.sub.2 is hydrogen;
- R.sub.3 and R.sub.4 are the same or different and each is butyl, pentyl or hexyl;
- and R.sub.5 is hydrogen, or alkyl or alkanoyl each of up to 4 C-atoms.
A compound of the formula ##STR16## wherein R.sub.1 is hydrogen;
- R.sub.2 is hydrogen;
- R.sub.3 and R.sub.4 each is methyl;
- and R.sub.5 is ethyl, propyl, butyl, propanoyl or butanoyl.
A compound of the formula ##STR17## wherein R.sub.1 is hydrogen;
- R.sub.2 is hydrogen;
- R.sub.3 is methyl;
- R.sub.4 is ethyl;
- and R.sub.5 is alkyl or alkanoyl each of up to 4 C-atoms.
Dependencies are inferred from the claim text.