Photosensitive hydroxyalkylphenones
AssigneeMerck Patent GmbH
InventorsJurgen Gehlhaus, Manfred Kieser
Life of this patent
Estimating the term…
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.
Claims21
A method of photopolymerizing a photopolymerizable composition which comprises irradiating, with effective radiation, a composition comprising at least one photopolymerizable unsaturated compound and a photosensitizingly effective amount of at least one compound of formula (I) ##STR10## wherein R.sub.1 is hydrogen, chlorine, phenyl, diaklylamino 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;
- R.sub.5 is hydrogen;
- and R.sub.6 is hydrogen or methyl.
A method of hardening a printing dye which comprises irradiating, with effective radiation, a composition comprising a photohardenable printing dye and a photosensitizingly effective amount of at least one compound of formula (I) ##STR11## 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;
- R.sub.5 is hydrogen;
- and R.sub.6 is hydrogen or methyl.
A photopolymerizable composition comprising a photosensitizingly effective amount of at least one compound of formula (I) ##STR12## 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 hydrogen;
- and R.sub.6 is hydrogen or methyl, and at least one photopolymerizable unsaturated compound.
A photopolymerizable composition comprising a photosensitizingly effective amount of at least one compound of formula (I) ##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;
- R.sub.5 is hydrogen;
- and R.sub.6 is hydrogen or methyl, and a photohardenable printing dye.
Dependencies are inferred from the claim text.