Curable phase change compositions and methods for using such compositions
View Patent ↗The phase change, curable composition comprises curable monomer, photoinitiator that initiates polymerization of the curable monomer, and phase change agent that provides the composition with an increase in viscosity of at least four orders of magnitude, from a first temperature, the first temperature being from 50° C. to 130° C., to a second temperature, the second temperature being from 0° C. to 70° C., wherein the second temperature is at least 10° C. below the first temperature. A coating over an image may be applied by providing a composition comprising curable monomer at a first temperature; applying the composition over the image, the image being at a second temperature; and exposing the composition to radiation to initiate polymerization of the curable monomer. In this process, the composition has a viscosity at the second temperature that is at least four orders of magnitude greater than its viscosity at the first temperature.
1. A composition, comprising:
(a) curable monomer;
(b) at least one photoinitiator that initiates polymerization of said curable monomer; and
(c) phase change agent that provides the composition with an increase in viscosity of at least four orders of magnitude, from a first temperature, said first temperature being from 50° C. to 130° C., to a second temperature, said second temperature being from 0° C. to 70° C., wherein the second temperature is at least 10° C. below the first temperature,
wherein the phase change agent is selected from the group consisting of hydrogenated castor oil, 1,10-decanediol, 1,12-dodecanediol, hydroxyl-terminated polyethylene waxes, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-nonadecanol, 1-eicosanol, 1-tricosanol, 1-tetracosanol, 1-pentacosanol, 1-hexacosanol, 1-heptacosanol, 1-octacosanol, 1-nonacosanol, 1-tricontanol, 1-dotriacontanol, 1-tritriacontanol, 1-tetratriacontanol, 2-tetradecyl 1-octadecanol, 2-hexadecyl 1-eicosanol, 2-octadecyl 1-docosanol, 2-nonadecyl 1-tricosanol, 2-eicosyl tetracosanol, 1,8-octanediol, 1,9-nonanediol, 1,13-tridecanediol, 1,14-tetradecanediol, 1,15-pentadecanediol, 1,16-hexandecanediol, 1,17-heptadecanediol, 1,18-octadecanediol, 1,19-nonadecanediol, 1,20-eicosanediol, 1,22-docosanediol, 1,25-pentacosanediol, and mixtures thereof.
2. The composition according to claim 1 , wherein said first temperature is from 60° C. to 120° C.
3. The composition according to claim 1 , wherein said second temperature is from 20° C. to 50° C.
4. The composition according to claim 1 , wherein said photoinitiator cationically initiates polymerization of said curable monomer.
5. The composition according to claim 1 , wherein said composition is colorless and substantially transparent.
6. The composition according to claim 1 , wherein said composition has a viscosity of from 8 to 15 cP at a temperature between 50° C. and 130° C.
7. The composition according to claim 1 , wherein the composition has a viscosity at said second temperature that is at least five orders of magnitude greater than its viscosity at said first temperature.
8. The composition according to claim 1 , wherein said curable monomer is selected from the group consisting of vinyl ethers, epoxides and oxetanes.
9. The composition according to claim 8 , wherein said curable monomer is a diurethane divinyl ether oil.
10. The composition according to claim 1 , wherein said phase change agent is at least one alcohol that is solid at the second temperature.
11. The composition according to claim 1 , wherein said composition comprises from about 40 to about 70 weight % curable monomer, from about 10 to about 50 weight % phase change agent and from about 1 to about 15 weight % photoinitiator.
12. A method for applying a coating over an image on a substrate, said method comprising:
(a) providing a composition according to claim 1 at said first temperature;
(b) applying said composition over said image, said image being at said second temperature; and
(c) exposing the composition to radiation to initiate polymerization of the curable monomer.
13. The method according to claim 12 , wherein said image is a toner image.
14. A method for applying a coating over an image on a substrate, said method comprising:
(a) providing a composition comprising curable monomer at a first temperature;
(b) applying said composition over said image, said image being at a second temperature, wherein the composition has a viscosity at said second temperature that is at least four orders of magnitude greater than its viscosity at said first temperature; and
(c) exposing the composition to radiation to initiate polymerization of the curable monomer.
15. The method according to claim 14 , wherein the composition has a viscosity at said second temperature that is at least five orders of magnitude greater than its viscosity at said first temperature.
16. The method according to claim 14 , wherein said image is a toner image.
17. The method according to claim 16 , wherein said toner image is formed from emulsion aggregation toner.
18. The method according to claim 14 , wherein the coating formed over the image is colorless and substantially transparent.
19. The method according to claim 14 , wherein said composition is applied over the image by ink jet printing.
20. A xerographic device comprising an image generating component and an ink jet device containing a composition according to claim 1 .