Radiation curable water based cationic inks and coatings
First Claim
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1. An actinic radiation curable, cationic polymerizable, composition comprising an aqueous solution of:
- (a) a cationic polymerizable compound having two or more epoxy groups, oxetane groups, or a combination thereof;
(b) a hydroxy alkyl cyclic ether selected from the group consisting of a hydroxyalkyl oxetane compound, a hydroxyalkyl epoxy compound, and a combination thereof;
(c) water; and
(d) a cationic initiator.
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Abstract
An actinic radiation curable, cationic polymerizable, ink and coating composition having greatly enhanced reactivity, and reduced viscosity and are low in odor comprised of an aqueous solution containing a cationic polymerizable compound such as an cycloaliphatic epoxy compound, a water compatible hydroxy functional cyclic ether compound, particularly, an epoxy or oxetane compound, and water.
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Citations
25 Claims
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1. An actinic radiation curable, cationic polymerizable, composition comprising an aqueous solution of:
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(a) a cationic polymerizable compound having two or more epoxy groups, oxetane groups, or a combination thereof;
(b) a hydroxy alkyl cyclic ether selected from the group consisting of a hydroxyalkyl oxetane compound, a hydroxyalkyl epoxy compound, and a combination thereof;
(c) water; and
(d) a cationic initiator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
wherein R1 is an alkenyl group having 1 to 2 carbon atoms, and R2 is hydrogen or an alkyl group having 1 to 6 carbon atoms.
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7. The composition of claim 6 wherein the hydroxyalkyl oxetane is 3-ethyl-3-hydroxymethyl-oxetane.
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8. The composition of claim 1 wherein the hydroxy alkyl cyclic ether is the hydroxyalkyl epoxy compound.
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9. The composition of claim 8 wherein the hydroxyalkyl epoxy compound has the structure:
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wherein R3 is an alkenyl group having 1 to 2 carbon atoms, and R4 is hydrogen or an alkyl group having 1 to 6 carbon atoms.
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10. The composition of claim 9 wherein the hydroxyalkyl epoxy compound is 4-hydroxymethyl-1,2-epoxycyclohexane.
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11. The composition of claim 1 wherein the hydroxy alkyl cyclic ether is the combination of the hydroxyalkyl oxetane and the hydroxyalkyl epoxy.
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12. The composition of claim 11 wherein the hydroxyalkyl oxetane is 3-ethyl-3-hydroxymethyl-oxetane and the hydroxyalkyl epoxy is 4-hydroxymethyl-1,2-epoxycyclohexane.
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13. The composition of claim 1 wherein the actinic radiation is ultraviolet radiation.
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14. The composition of claim 1 wherein the actinic radiation is an electron beam.
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15. The composition of claim 1 wherein the coating composition further comprises a colorant.
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16. The composition of claim 15 wherein the colorant is a dye.
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17. The composition of claim 15 wherein the colorant is a pigment dispersed in the aqueous solution.
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18. The composition of claim 1 wherein the coating composition further comprises a vinyl ether.
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19. The composition of claim 1 further comprising less than 35 wt. % based on the weight of the coating composition of a free radical, addition polymerizable composition.
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20. The composition of claim 19 wherein the free radical, addition polymerizable composition comprises:
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(1) an oligomer, a polymer or a combination thereof, (2) an ethylenically unsaturated monomeric diluent; and
(3) a free radical photoinitiation system activated by the actinic radiation.
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21. An actinic radiation curable, cationic polymerizable, composition comprised of
an aqueous solution of components: - (a) a cationic polymerizable compound having two or more epoxy groups, oxetane groups, or a combination thereof;
(b) a hydroxy alkyl cyclic ether selected from the group consisting of a hydroxyalkyl oxetane compound, a hydroxyalkyl epoxy compound, and a combination thereof;
(c) water; and
(d) a cationic initiator;
having physical properties characterized by a three component phase diagram;
wherein the vertices of said diagram represent 100 wt. % concentration of each component (a), (b) and (c); and
wherein the binary concentrations of the cationic polymerizable compound and water are plotted along a first binary axis;
the binary concentrations of the hydroxy alkyl cyclic ether and cationic polymerizable compound are plotted along a second binary axis; and
the binary concentrations of the water and cyclic ether are plotted along a third binary axis; and
wherein a cloud point curve within said diagram separates the single phase concentration region from the two-phase concentration region for the ternary mixture of components (a), (b) and (c). - View Dependent Claims (22, 23, 24, 25)
- (a) a cationic polymerizable compound having two or more epoxy groups, oxetane groups, or a combination thereof;
Specification