Phase change inks containing curable amide gellant compounds
View Patent ↗Disclosed is a phase change ink comprising a colorant, an initiator, and a phase change ink carrier, said carrier comprising at least one radically curable monomer compound and a compound of the formula wherein R 1 and R 1 ′ each, independently of the other, is an alkyl group having at least one ethylenic unsaturation, an arylalkyl group having at least one ethylenic unsaturation, or an alkylaryl group having at least one ethylenic unsaturation, R 2 , R 2 ′, and R 3 each, independently of the others, are alkylene groups, arylene groups, arylalkylene groups, or alkylarylene groups, and n is an integer representing the number of repeat amide units and is at least 1. Also disclosed herein is a method of printing with the phase change ink.
1. A phase change ink comprising a colorant, an initiator, and a phase change ink carrier, said carrier comprising at least one radically curable monomer compound and a compound of the formula
wherein R 1 and R 1 ′ each, independently of the other, is (i) an alkyl group having at least one ethylenic unsaturation therein, including linear and branched, cyclic and acyclic, and substituted and unsubstituted alkyl groups, and wherein hetero atoms either may or may not be present in the alkyl group, (ii) an arylalkyl group having at least one ethylenic unsaturation therein, including substituted and unsubstituted arylalkyl groups, wherein the alkyl portion of the arylalkyl group can be linear or branched, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the arylalkyl group, or (iii) an alkylaryl group having at least one ethylenic unsaturation therein, including substituted and unsubstituted alkylaryl groups, wherein the alkyl portion of the alkylaryl group can be linear or branched, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the alkylaryl group, R 2 , R 2 ′, and R 3 each, independently of the others, are (i) alkylene groups, including linear and branched, saturated and unsaturated, cyclic and acyclic, and substituted and unsubstituted alkylene groups, and wherein hetero atoms either may or may not be present in the alkylene group, (ii) arylene groups, including substituted and unsubstituted arylene groups, and wherein hetero atoms either may or may not be present in the arylene group, (iii) arylalkylene groups, including substituted and unsubstituted arylalkylene groups, wherein the alkyl portion of the arylalkylene group can be linear or branched, saturated or unsaturated, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the arylalkylene group, or (iv) alkylarylene groups, including substituted and unsubstituted alkylarylene groups, wherein the alkyl portion of the alkylarylene group can be linear or branched, saturated or unsaturated, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the alkylarylene group, and n is an integer representing the number of repeat amide units and is at least 1.
2. An ink according to claim 1 wherein R 1 and R 1 ′ are the same as each other.
3. An ink according to claim 1 wherein R 1 and R 1 ′ are both alkyl groups having at least one ethylenic unsaturation therein, including linear and branched, cyclic and acyclic, and substituted and unsubstituted alkyl groups, and wherein hetero atoms either may or may not be present in the alkyl group.
4. An ink according to claim 3 wherein the alkyl groups are unsubstituted alkyl groups.
5. An ink according to claim 1 wherein R 1 and R 1 ′ are each of the formula
wherein m is an integer representing the number of repeating [O—(CH 2 ) 2 ] units.
6. An ink according to claim 1 wherein R 2 and R 2 ′ are both alkylene groups, including linear and branched, saturated and unsaturated, cyclic and acyclic, and substituted and unsubstituted alkylene groups, and wherein hetero atoms either may or may not be present in the alkylene group.
7. An ink according to claim 6 wherein the alkylene groups are saturated unsubstituted alkylene groups.
8. An ink according to claim 1 wherein R 2 and R 2 ′ are each groups of the formula —C 34 H 56+a — and are branched alkylene groups which may include unsaturations and cyclic groups, wherein a is an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12.
9. An ink according to claim 8 wherein R 2 and R 2 ′ include isomers of the formula
10. An ink according to claim 1 wherein R 3 is an alkylene group, including linear and branched, saturated and unsaturated, cyclic and acyclic, and substituted and unsubstituted alkylene groups, and wherein hetero atoms either may or may not be present in the alkylene group.
11. An ink according to claim 10 wherein the alkylene group is a saturated unsubstituted alkylene group.
12. An ink according to claim 1 wherein R 3 is a —CH 2 CH 2 — group.
13. An ink according to claim 1 wherein n is 1 or 2.
14. An ink according to claim 1 wherein the compound is of the formula
wherein —C 34 H 56+a — represents a branched alkylene group which may include unsaturations and cyclic groups, wherein a is an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 and wherein n is 1 or 2.
15. An ink according to claim 1 wherein the compound is of the formula
16. An ink according to claim 1 wherein the compound is of the formula
or mixtures thereof, wherein —C 34 H 56+a — represents a branched alkylene group which may include unsaturations and cyclic groups, wherein a is an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12, n is 1 or 2, and m is an integer representing the number of repeating [O—(CH 2 ) 2 ] units.
17. An ink according to claim 1 wherein the compound is of the formula
or mixtures thereof, wherein n is 1 or 2 and m is an integer representing the number of repeating [O—(CH 2 )2] units.
18. An ink according to claim 1 wherein the compound of the formula
is present in the ink in an amount of at least about 5 percent by weight of the ink carrier.
19. An ink according to claim 1 wherein the compound of the formula
is present in the ink in an amount of no more than about 50 percent by weight of the ink carrier.
20. An ink according to claim 1 wherein the radically curable monomer compound is propoxylated neopentyl diacrylate, isobornyl acrylate, isobornyl methacrylate, lauryl acrylate, lauryl methacrylate, isodecylacrylate, isodecylmethacrylate, caprolactone acrylate, 2-phenoxyethyl acrylate, isooctylacrylate, isooctylmethacrylate, butyl acrylate, or mixtures thereof.
21. An ink according to claim 1 wherein the carrier further contains a multifunctional acrylate or methacrylate compound.
22. An ink according to claim 21 wherein the multifunctional acrylate or methacrylate compound is pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, 1,2-ethylene glycol diacrylate, 1,2-ethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, 1,12-dodecanol diacrylate, 1,12-dodecanol dimethacrylate, tris(2-hydroxy ethyl) isocyanurate triacrylate, hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, amine modified polyether acrylate, trimethylolpropane triacrylate, glycerol propoxylate triacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, ethoxylated pentaerythritol tetraacrylate, or mixtures thereof.
23. An ink according to claim 1 wherein the colorant is present in the ink in an amount of at least about 0.1 percent by weight of the ink and wherein the color is present in the ink in an amount of no more than about 8 percent by weight of the ink.
24. A process which comprises (I) incorporating into an ink jet printing apparatus a phase change ink composition comprising a colorant, an initiator, and a phase change ink carrier, said carrier comprising at least one radically curable monomer compound and a compound of the formula
wherein R 1 and R 1 ′ each, independently of the other, is (i) an alkyl group having at least one ethylenic unsaturation therein, including linear and branched, cyclic and acyclic, and substituted and unsubstituted alkyl groups, and wherein hetero atoms either may or may not be present in the alkyl group, (ii) an arylalkyl group having at least one ethylenic unsaturation therein, including substituted and unsubstituted arylalkyl groups, wherein the alkyl portion of the arylalkyl group can be linear or branched, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the arylalkyl group, or (iii) an alkylaryl group having at least one ethylenic unsaturation therein, including substituted and unsubstituted alkylaryl groups, wherein the alkyl portion of the alkylaryl group can be linear or branched, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the alkylaryl group, R 2 , R 2 ′, and R 3 each, independently of the others, are (i) alkylene groups, including linear and branched, saturated and unsaturated, cyclic and acyclic, and substituted and unsubstituted alkylene groups, and wherein hetero atoms either may or may not be present in the alkylene group, (ii) arylene groups, including substituted and unsubstituted arylene groups, and wherein hetero atoms either may or may not be present in the arylene group, (iii) arylalkylene groups, including substituted and unsubstituted arylalkylene groups, wherein the alkyl portion of the arylalkylene group can be linear or branched, saturated or unsaturated, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the arylalkylene group, or (iv) alkylarylene groups, including substituted and unsubstituted alkylarylene groups, wherein the alkyl portion of the alkylarylene group can be linear or branched, saturated or unsaturated, cyclic or acyclic, and substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the alkylarylene group, and n is an integer representing the number of repeat amide units and is at least 1, said ink being curable upon exposure to ultraviolet radiation; (II) melting the ink; (III) causing droplets of the melted ink to be ejected in an imagewise pattern onto a substrate; and (IV) exposing the imagewise pattern to ultraviolet radiation.
25. A process according to claim 24 wherein the substrate is a final recording sheet and droplets of the melted ink are ejected in an imagewise pattern directly onto the final recording sheet and the imagewise pattern on the final recording sheet is exposed to ultraviolet radiation.
26. A process according to claim 24 wherein the substrate is an intermediate transfer member and droplets of the melted ink are ejected in an imagewise pattern onto the intermediate transfer member followed by transfer of the imagewise pattern from the intermediate transfer member to a final recording sheet, and wherein the imagewise pattern on the final recording sheet is exposed to ultraviolet radiation.
27. A process according to claim 26 wherein the intermediate transfer member is heated to a temperature above that of the final recording sheet and below that of the melted ink in the printing apparatus.
28. A process according to claim 24 wherein the substrate is paper.
29. A process according to claim 24 wherein the substrate is transparency material.
30. A process according to claim 24 wherein the substrate is a polymeric film.
31. A process according to claim 24 wherein the substrate is metal.
32. A process according to claim 24 wherein the substrate is a fabric, a textile product, a plastic, or wood.