Polymeric photoinitiators
The present invention relates to radiation curable compositions (A) comprising—(a) at least one photoinitiator compound of formula (I) wherein Q is the residue of a hydroxy compound having 1 to 6 hydroxyl groups, and wherein x is a number that is at least 1 but no greater than the number of hydroxyl groups originally present in said hydroxy compound;—(b) at least one ethylenically unsaturated compound selected from monomers (b1) and/or from oligomers (b2); and—(c) optionally, at least one co-synergist which preferably is an amino co-synergist. The present invention further relates to photoinitiator compounds(a) and their preparation.
1. A radiation curable composition (A) comprising,
(a) at least one photoinitiator compound of formula (I):
wherein Q is the residue of a hydroxy compound having 1 to 6 hydroxyl groups,
wherein x is a number that is at least 1 but no greater than the number of hydroxyl groups originally present in said hydroxy compound, and
wherein the hydroxy compound is a saturated hydroxy compound having 1 to 6 hydroxyl groups and is selected from the group consisting of an alkoxylated alcohol and a polyether; and
(b) at least one ethylenically unsaturated compound selected from the group consisting of monomers (b1) and oligomers (b2).
2. The composition of claim 1 , comprising at least one photoinitiator compound of formula (I) wherein the alkoxylated alcohol is an alkoxylated polyol.
3. The composition of claim 2 , wherein the alkoxylated polyol is an oxyethylated and/or oxypropylated polyol.
4. The composition of claim 1 , comprising at least one photoinitiator compound of formula (I) wherein the polyether is a poly(alkylene glycol).
5. The composition of claim 4 , wherein the poly(alkylene glycol) is selected from the group consisting of polyethylene glycol, polypropylene glycol and polytetrahydrofurane.
6. The composition of claim 1 , wherein the amount of compounds (a) in said composition is from 1 to 20% by weight.
7. The composition of to claim 1 , wherein compounds (b) are (meth)acrylated compounds.
8. The composition of claim 1 , wherein the amount of compounds (b2) in said composition is at most 80% by weight.
9. The composition of claim 1 , further comprising from 0 to 25% by weight of at least one co-synergist (c).
10. The composition of claim 9 , wherein the co-synergist is an amine co-synergist.
11. A photoinitiator compound (a) of formula (I):
wherein Q is the residue of a hydroxy compound having 1 to 6 hydroxyl groups,
wherein x is a number that is at least 1 but no greater than the number of hydroxyl groups originally present in said hydroxy compound, and
wherein the hydroxy compound is a saturated hydroxy compound having 1 to 6 hydroxyl groups and is selected from the group consisting of an alkoxylated alcohol and a polyether.
12. The photoinitiator compound (a) of claim 11 , wherein the polyether is a poly(alkylene glycol).
13. A varnish, lacquer, ink or coating composition comprising the composition (A) according to claim 1 .
14. A process for preparing a cured polymeric composition by exposing the composition according to claim 1 to radiation.
15. An article printed or coated, entirely or in part, with the composition according to claim 1 .
16. A varnish, lacquer, ink or coating composition comprising the photoinitiator compound (a) according to claim 11 .
17. The composition according to claim 7 , wherein the (meth)acrylated compounds are acrylated compounds.
18. The composition according to claim 1 , wherein the composition comprises at least one compound (b 1) and at least one compound (b2).
19. The composition according to claim 1 , wherein x is 2.