Photosensitive hydroxylalkylphenones
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.
Claims11
In a method of photopolymerizing a photopolymerizable composition comprising at least one photopolymerizable unsaturated compound and a photosensitizingly effective amount of at least one photosensitizer, comprising irradiating the photopolymerizable composition with effective radiation, the improvement wherein the photosensitizer comprises at least one compound of the formula ##STR13## wherein R.sub.1 is hydrogen, chlorine, 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 or alkoxy each of up to 4 C-atoms;
- R.sub.3 and R.sub.4 which can be the same or different, each is alkyl of up to 6 C-atoms;
- and R.sub.5 is alkyl or alkanoyl each of up to 4 C-atoms and R.sub.6 is hydrogen or methyl.
A photopolymerizable composition comprising at least one photopolymerizable unsaturated compound and a photosensitizingly effective amount of at least one compound of the formula ##STR14## wherein R.sub.1 is hydrogen, chlorine, 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 or alkoxy each of up to 4 C-atoms;
- R.sub.3 and R.sub.4 which can be the same or different, each is alkyl of up to 6 C-atoms;
- and R.sub.5 is alkyl or alkanoyl each of up to 4 C-atoms and R.sub.6 is hydrogen or methyl.
Dependencies are inferred from the claim text.