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Photocurable colored compositions employing alpha-amino phenone initiator
| Details |
Inventors: Husler, Rinaldo; Kirchmayr, Rudolf; Rutsch, Werner;
Assignee: Ciba Geigy Corporation (Ardsley, NY)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Compounds of the formula I, II or III ##STR1## in which Ar and Ar' are an oxygen-containing aromatic radical, R.sup.1 and R.sup.2 are a monovalent hydrocarbon radical which is substituted or unsubstituted, or R.sup.1 and R.sup.2 together form alkylene, oxaalkylene or azaalkylene, R.sup.3 is a direct bond or a divalent hydrocarbon radical, X and X' are a monovalent amino group and Y is a divalent amino or diamino group, are excellent photoinitiators for the photocuring of colored, especially pigmented, compositions containing an olefinically unsaturated, photopolymerizable binder. |
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DETAILED DESCRIPTION What is claimed is: 1.
A photocurable coloured composition containing: (a) an olefinically unsaturated, photopolymerisable binder, (b) a pigment or a dye and (c) as photoinitiator, at least one compound of the formula I ##STR43## wherein Ar is a phenyl radical substituted in the 4-position by a group --OR.
sup.
9, R.
sup.
9 is C.
sub.
1 -C.
sub.
8 -alkyl, C.
sub.
3 -C.
sub.
6 -alkenyl, cyclohexyl, benzyl, phenyl, tolyl or one of the groups: --CH.
sub.
2 CH.
sub.
2 OH, --CH.
sub.
2 CH.
sub.
2 --OOC--CH.
dbd.
CH.
sub.
2, --CH.
sub.
2 --COO(C.
sub.
1 -C.
sub.
4 -alkyl), --CH.
sub.
2 CH.
sub.
2 --COO(C.
sub.
1 -C.
sub.
4 -alkyl), ##STR44## R.
sup.
1 and R.
sup.
2 are C.
sub.
1 -C.
sub.
4 -alkyl, or R.
sup.
1 and R.
sup.
2 together are C.
sub.
4 -C.
sub.
5 -alkylene, and X and X' are a morpholino radical or a radical of the formula --N(CH.
sub.
2 CH.
sub.
2 --OCH.
sub.
3).
sub.
2, or an acid addition salt thereof.
2.
A printing ink according to claim 1.
3.
A composition according to claim 1, which additionally contains a thioxanthone derivative as a sensitiser.
4.
A process for the photochemical curing of coloured compositions containing an olefinically unsaturated, photopolymerisable binder, a pigment and a photoinitiator, by irradiation with shortwave light, which process comprises using a compound of the formula I according to claim 1.
5.
A process according to claim 4, wherein the coloured composition is a printing ink.
6.
A composition according to claim 1 wherein the photoinitiator is ##STR45## 7.
A composition according to claim 1 wherein the photoinitiator is ##STR46## 8.
A composition according to claim 1 wherein the photoinitiator is ##STR47## 9.
A composition according to claim 1 wherein the photoinitiator is ##STR48##
Description:
The invention relates to photocurable coloured compositions containing an olefinically unsaturated binder, a pigment or a dye and a specific photoinitiator.
The photoinitiator is an aromatic-aliphatic ketone which contains, in the aromatic moiety, one or more hydroxyl or ether groups and contains, in the aliphatic moiety, a tertiary
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