# US 5,803,958 A · Black ink jet ink composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,803,958 A - Document ID: US5803958A - Status: Granted - Kind: A - Application number: 08/698,868 - Filed: 1996-08-16 - Granted: 1998-09-08 - Earliest claimed: 1996-08-16 - Assignees: Rexam Graphics Inc. - Inventors: Boris Joseph Katsen; Richard S. Himmelwright; Nate R. Schwartz; Barbara Jones Stewart - Web page: https://patentgrep.com/patent/US5803958A ## CPC - C09D 11/322: Pigment inks - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract Provided is a black ink jet ink which exhibits excellent non-fading properties. The ink jet ink is comprised of water, carbon black, cyan and magenta pigments, a water immiscible organic compound exhibiting a high boiling point, and a water miscible compound. The combination of the water immiscible compound and the water miscible compound provides for excellent anti-crusting properties. ## Claims ### Claim 1 An ink jet ink formulation comprised of carbon black, cyan and magenta pigments, water, a water immiscible organic compound exhibiting a high boiling point, and a water miscible compound, with at least a portion of the water immiscible organic compound being absorbed by the cyan and magenta pigments. ### Claim 2 (depends on 1) The ink jet ink formulation of claim 1, wherein the amount of organic compound and water miscible compound is sufficient to effect anti-crusting of the ink formulation. ### Claim 3 (depends on 1) The ink jet ink formulation of claim 1, wherein the organic compound exhibits a boiling point of at least about 280.degree. C. ### Claim 4 (depends on 1) The ink jet ink formulation of claim 1, wherein the water immiscible organic compound is selected from the group consisting of dibutyl phthalate, diethylhexyl phthalate, butyloctanoate, butylbenzyl phthalate and diisooctylphthalate. ### Claim 5 (depends on 1) The ink jet ink formulation of claim 1, wherein the water immiscible organic compound is comprised of dibutyl phthalate. ### Claim 6 (depends on 1) The ink jet ink formulation of claim 1, wherein the water immiscible organic compound is comprised of diisooctylphathalate. ### Claim 7 (depends on 1) The ink jet ink formulation of claim 1, wherein the water miscible compound exhibits a boiling point of at least 160.degree. C. ### Claim 8 (depends on 1) The ink jet ink formulation of claim 1, wherein the water miscible compound is selected from the group consisting of diacetone alcohol, 1-3-propanediol and hexadecanol, 1,2-propanediol, diethylene glycol, polyethylene glycol and mixtures thereof. ### Claim 9 (depends on 10) The ink jet ink formulation of claim 10, wherein the water miscible compound is comprised of diacetone alcohol, 1,3-propanediol or diethylene glycol. ### Claim 10 (depends on 1) The ink jet ink formulation of claim 1, wherein the amount of carbon black and pigment in the formulation ranges from about 2 to 10 wt %, the amount of water immiscible organic compound ranges from about 0.1 to 1 wt %, the amount of water miscible compound ranges from about 0.1 to 35 wt %, with the remainder of the formulation comprising water. ### Claim 11 (depends on 1) The ink jet ink formulation of claim 1, wherein the amount of carbon black and pigment in the formulation ranges from about 3.5 to about 7 wt % based upon the weight of the entire formulation, the amount of water immiscible organic compound ranges from about 0.1 to 1.0 wt %, the amount of water miscible compound ranges from about 0.5 to 10 wt %, with the remainder of the formulation comprising water. ### Claim 12 (depends on 1) The ink jet ink formulation of claim 1, wherein the formulation comprises from about 3.5 to about 10 wt % solids. ### Claim 13 (depends on 12) The ink jet ink formulation of claim 12, wherein the water immiscible organic compound is comprised of dibutyl phthalate, and with the dibutyl phthalate comprising from 5 to 20 wt % of the formulation based upon the weight of solids. ### Claim 14 (depends on 1) A process for preparing the ink jet ink formulation of claim 1, wherein a dispersion of the components of the formulation is subjected to comminution followed by a separation step. ### Claim 15 (depends on 14) The process of claim 14, wherein additional water miscible compound is added subsequent to the separation step. ### Claim 16 (depends on 14) The process of claim 14, wherein the separation step comprises centrifugation. ### Claim 17 (depends on 14) The process of claim 14, wherein the comminution is such as to create a bimodal dispersion of the pigment particles, and the separation comprises separating out one of the modes. ### Claim 18 (depends on 14) The process of claim 14, wherein the comminution comprises passing the dispersion of component through a microfluidizer. ### Claim 19 (depends on 15) The process of claim 15, wherein the comminution results in a pigment in water microemulsion. ### Claim 20 (depends on 1) A process for printing which comprises using the ink jet ink formulation of claim 1 in an ink jet printer, and applying the ink to a printing medium with the ink jet printer. ### Claim 21 (depends on 20) The process of claim 20, wherein the medium to which the ink is applied is coated ink jet paper. ### Claim 22 (depends on 20) The process of claim 20, wherein the medium to which the ink is applied is plain paper. ### Claim 23 (depends on 20) The process of claim 20, wherein the medium to which the ink is applied is paper suitable for outdoor use. ### Claim 24 (depends on 20) The process of claim 20, wherein the ink jet printer is a deskjet printer. ### Claim 25 (depends on 20) The process of claim 20, wherein the ink jet printer is a wide format printer.