Water cleanable phase change ink for ophthalmic lens marking

Patent metadata

Field	Value
Publication number	US-9388320-B2
Application number	US-201414569676-A
Country	US
Kind code	B2
Filing date	Dec 13, 2014
Priority date	Dec 13, 2014
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A water dispersible phase change ink composition for printing on ophthalmic lenses including a hydrophilic wax having at least one ethoxyl moiety; a low viscosity wax having at least one hydroxyl group, wherein the low viscosity wax is miscible with the hydrophilic wax; an optional stabilizer; and a colorant. A ink jet printer stick or pellet comprising the water dispersible phase change ink composition.

First claim

The invention claimed is:

1. A water dispersible phase change ink composition for printing on ophthalmic lenses comprising:
a hydrophilic wax having at least one ethoxyl moiety;
a low viscosity wax having at least one hydroxyl group, wherein the low viscosity wax is miscible with the hydrophilic wax;
wherein the low viscosity wax is selected from the group consisting of stearyl alcohol, behenyl alcohol, and combinations thereof;
an optional stabilizer; and
a colorant.

2. The water dispersible phase change ink composition of claim 1 , further comprising:
an amide.

3. The water dispersible phase change ink composition of claim 1 , wherein the hydrophilic wax is an ethoxylated alcohol.

4. The water dispersible phase change ink composition of claim 1 , wherein the hydrophilic wax is an ethoxylated alcohol of the formula
CH 3 —(CH 2 CH 2 ) n —(CH 2 CH 2 O) m —H

wherein n is an integer and wherein m is an integer, and wherein n and m are each independently selected such that the total number of carbon atoms is from about 20 to about 50.

5. The water dispersible phase change ink composition of claim 1 , wherein the low viscosity wax is a wax having a viscosity of from about 1 to about 15 centipoise at a temperature in the range of from about 80° C. to about 120° C.

6. The water dispersible phase change ink composition of claim 1 , wherein the low viscosity wax behenyl alcohol.

7. The water dispersible phase change ink composition of claim 1 , wherein the amide is selected from the group consisting of monoamide, triamide, tetra-amide, and combinations thereof.

8. The water dispersible phase change ink composition of claim 1 , wherein the amide comprises a branched triamide.

9. The water dispersible phase change ink composition of claim 1 , wherein the stabilizer is present and is selected from the group consisting of aromatic amine, hindered amine, phenol, and combinations thereof.

10. The water dispersible phase change ink composition of claim 1 , wherein the stabilizer is an aromatic amine antioxidant.

11. The water dispersible phase change ink composition of claim 1 , wherein the colorant is selected from the group consisting of dyes, pigments, and combinations thereof.

12. The water dispersible phase change ink composition of claim 1 , wherein the colorant comprises a yellow dye.

13. The water dispersible phase change ink composition of claim 1 , wherein the colorant comprises a black dye.

14. An ink jet printer stick or pellet comprising a water dispersible phase change ink composition for printing on ophthalmic lenses, wherein the phase change ink composition comprises:
a hydrophilic wax having at least one ethoxyl moiety;
a low viscosity wax having at least one hydroxyl group, wherein the low viscosity wax is miscible with the hydrophilic wax;
wherein the low viscosity wax is selected from the group consisting of stearyl alcohol, behenyl alcohol, and combinations thereof;
an optional stabilizer, wherein the optional stabilizer, if present, is selected from the group consisting of hindered amine, phenol, and combinations thereof; and
a colorant.

15. The ink jet printer stick or pellet of claim 14 , further comprising:
an amide.

16. The ink jet printer stick or pellet of claim 14 , wherein the hydrophilic wax is an ethoxylated alcohol.

17. The ink jet printer stick or pellet of claim 14 , wherein the low viscosity wax is behenyl alcohol.

18. The ink jet printer stick or pellet of claim 14 , wherein the amide is selected from the group consisting of monoamide, triamide, tetra-amide, and combinations thereof.

19. The ink jet printer stick or pellet of claim 14 , wherein the colorant is a black dye or a yellow dye.

Assignees

• Xerox Corp

Inventors

• Wu Bo
• Thomas Jr Jule W

Classifications

• C09D11/38 Primary

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09D11/34

  Hot-melt inks · CPC title

• C09D191/06

  Waxes · CPC title

• C09D11/328 Primary

  characterised by dyes · CPC title

• C08K5/20 Primary

  Carboxylic acid amides · CPC title