Curable thermally ejectable printing fluid

1. A curable printing fluid composition for a thermal fluid ejection device, comprising:

a curable liquid-phase monomer;

a substantially nonaqueous volatile driver fluid capable of being vaporized by a thermal fluid ejection printhead;

an initiator;

a phosphate ester resistor protectant; and

a colorant comprising a dye.

2. The composition of claim 1 , wherein the liquid-phase monomer comprises an acrylic monomer.

3. The composition of claim 1 , wherein the liquid-phase monomer comprises a mixture of two or more acrylic monomers, wherein at least one of the acrylic monomers is a mono-functional monomer and wherein at least one other of the acrylic monomers is a di-functional monomer.

4. The composition of claim 1 , wherein the liquid-phase monomer is the driver fluid.

5. The composition of claim 1 , wherein the driver fluid comprises at least one of methanol, ethanol, propanol, acetone, methyl acetate and ethyl acetate.

6. The composition of claim 5 , wherein the composition comprises approximately 15 to 35 percent driver fluid by total composition volume.

7. The composition of claim 1 , wherein the phosphate ester resistor protectant has a general formula of (R—O-E x ) y PO (4-y) H (3-y) , wherein R is a branched hydrocarbon, unbranched hydrocarbon, or perfluorinated hydrocarbon moiety with at least eight carbons, E is CH 2 CH x O or C(CH 3 )HCH 2 O, x is zero or an integer greater than zero, and y is an integer from 1 to 3.

8. The composition of claim 1 , wherein the composition comprises approximately 1 to 6 percent resistor protectant by total composition volume.

9. The composition of claim 1 , further comprising one or more oligomers selected from epoxies, polyesters, acrylics, and acrylic urethanes.

10. The composition of claim 1 , further comprising an adhesion promoter.

11. The composition of claim 10 , wherein the adhesion promoter comprises a 1,2 butyl glycol diacrylic ester.

12. The composition of claim 10 , wherein the composition comprises 0.1 to 20 percent adhesion promoter by total composition weight.

13. A thermal inkjet printing cartridge comprising a printhead and a UV-curable printing fluid composition for a thermal fluid ejection device, the printing fluid composition comprising:

at least one di-functional acrylic monomer;

at least one substantially nonaqueous driver fluid present in an amount of 0.1 to 50 weight percent by total composition weight;

at least one photoinitiator;

a dye; and

at least one phosphate ester resistor protectant present in an amount of 0.1 to 10 weight percent by total composition weight.

14. The cartridge of claim 12 , wherein the composition has a viscosity equal to or less than approximately 20 cps.

15. The cartridge of claim 12 , wherein the composition has a surface tension of between approximately 20 to 50 dyne/cm.

16. The cartridge of claim 12 , wherein the di-functional acrylic monomer is present in an amount of 0.1 to 90 weight percent by total composition weight.

17. The cartridge of claim 12 , wherein the substantially nonaqueous driver fluid is present in an amount of 5 to 40 weight percent by total composition weight.

18. The cartridge of claim 12 , wherein the phosphate ester resistor protectant has a general formula of (R—O-E x ) y PO (4-y) H (3-y) , wherein R is a branched hydrocarbon, unbranched hydrocarbon, or perfluorinated hydrocarbon moiety with at least eight carbons, E is CH 2 CH x O or C(CH 3 )HCH 2 O, x is zero or an integer greater than zero, and y is an integer from 1 to 3.

19. The cartridge of claim 12 , wherein the resistor protectant is present in an amount of 2 to 6 weight percent by total composition weight.

20. The cartridge of claim 12 , wherein the composition further comprises an adhesion promoter.