Gallium naphthalocyanine salts exhibiting reduced kogation
AssigneeSilverbrook Research Pty Ltd
InventorsSimone Charlotte Vonwiller, Sutharsiny Indusegaram, Graciel Gonzaga, Damon Donald Ridley, Kia Silverbrook
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Abstract
A sulfonated dye salt of formula (II): wherein M is Ga(A1); A1 is an axial ligand selected from the group consisting of: —OH and halogen; and Z1+, Z2+, Z3+ and Z4+ are independently selected from the group consisting of: H and an ammonium cation including 3 or more hydroxyl groups. At least one of Z1+, Z2+, Z3+ and Z4+ is the ammonium cation. Such salts exhibit reduced kogation in thermal bubble-forming inkjet printheads.
Claims13
A sulfonated dye salt of formula (II):
- wherein
- M is Ga(A1);
- A1 is an axial ligand selected from the group consisting of:
- —OH and halogen;
- and
- Z1+, Z2+, Z3+ and Z4+ are independently selected from the group consisting of:
- H and an ammonium cation comprising at least 4 hydroxyl groups, wherein at least one of Z1+, Z2+, Z3+ and Z4+ is said ammonium cation.
A method of reducing kogation in an inkjet printhead having a plurality of nozzles, each nozzle comprising:
- a nozzle chamber containing said ink;
- a heater element for heating said ink;
- and a nozzle opening for ejection of said ink, said method comprising:
- printing from the printhead utilizing an inkjet ink comprising a sulfonated dye salt of formula (II):
- wherein
- M is Ga(A1);
- A1 is an axial ligand selected from the group consisting of:
- —OH and halogen;
- and
- Z1+, Z2+, Z3+ and Z4+ are independently selected from the group consisting of:
- H and an ammonium cation comprising at least 4 hydroxyl groups, wherein at least one of Z1+, Z2+, Z3+ and Z4+ is said ammonium cation,
- wherein said heater element is comprised of titanium nitride or a nitride of a titanium alloy.
An inkjet printhead comprising a plurality of nozzles, each nozzle comprising:
- a nozzle chamber containing an inkjet ink;
- a heater element for heating said ink;
- and a nozzle opening for ejection of ink, wherein said heater element is comprised of titanium nitride or a nitride of a titanium alloy, and wherein said ink comprises a sulfonated dye salt of formula (II):
- wherein
- M is Ga(A1);
- A1 is an axial ligand selected from the group consisting of:
- —OH and halogen;
- and
- Z1+, Z2+, Z3+ and Z4+ are independently selected from the group consisting of:
- H and an ammonium cation comprising at least 4 hydroxyl groups, wherein at least one of Z1+, Z2+, Z3+ and Z4+ is said ammonium cation.
Dependencies are inferred from the claim text.