# US 2008/0187691 A1 · Rapid Ink Drying Papers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0187691 A1 - Document ID: US20080187691A1 - Status: Published application - Kind: A1 - Application number: 11/672,156 - Filed: 2007-02-07 - Published: 2008-08-07 - Earliest claimed: 2007-02-07 - Assignees: S.D. Warren Company - Inventors: Alonzo K. Osgood; Steven L. Masia; Daniel R. Coughlin; Phillip S. Coleman - Web page: https://patentgrep.com/patent/US20080187691A1 ## CPC - D21H 19/82: superposed {(D21H19/84 takes precedence)} - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR ## Abstract Papers are provided which exhibit rapid ink setting and ink drying. These papers include a topcoat layer, and a penultimate coating layer that draws ink through the topcoat layer. In some implementations, the penultimate coating layer includes a high internal pore volume filler, and/or has a fine external pigment pore structure. ## Claims ### Claim 1 A paper comprising: a basesheet; a penultimate coating layer; and a porous topcoat disposed directly adjacent the penultimate coating layer and having a surface exposed to receive a printed image; wherein the penultimate coating layer is configured to draw ink vehicle through the topcoat. ### Claim 2 (depends on 1) The paper of claim 1 wherein the penultimate coating includes a filler having a high internal pore volume. ### Claim 3 (depends on 1) The paper of claim 1 wherein the penultimate coating layer has an external pigment pore structure with a peak mean pore diameter finer than 0.20 μm. ### Claim 4 (depends on 3) The paper of claim 3 wherein the penultimate coating layer has an external pigment pore structure with a peak mean pore diameter finer than 0.10 μm. ### Claim 5 (depends on 2) The paper of claim 2 wherein the penultimate coating layer includes up to 30% of said filler. ### Claim 6 (depends on 2) The paper of claim 2 wherein the filler is selected from the group consisting of synthetic amorphous silica gels, synthetic calcium silicate, synthetic silicon dioxide, calcined clay, porous calcium carbonate, and mixtures thereof. ### Claim 7 (depends on 2) The paper of claim 2 wherein the filler comprises a particulate material that creates micro-spores in the coating by interaction of the particulate material with itself or other materials in the coating. ### Claim 8 (depends on 2) The paper of claim 2 wherein the filler has an internal pore volume of at least 0.8 ml/gram. ### Claim 9 (depends on 1) The paper of claim 1 wherein the penultimate coating layer comprises a pigment or pigment blend having an overall particle size distribution such that about 25% of the particles are finer than 0.2 μm, about 50% of the particles are finer than 0.5 μm, and about 70% of the particles are finer than 2 μm. ### Claim 10 (depends on 9) The paper of claim 9 wherein the penultimate coating layer comprises a blend of pigments having different particle size distributions, the pigments being selected and provided in relative proportions so as to provide the overall particle size distribution. ### Claim 11 (depends on 1) The paper of claim 1 wherein the penultimate coating layer includes a component having high ink vehicle interactivity. ### Claim 12 (depends on 1) The paper of claim 1 wherein the topcoat comprises a pigment or pigment blend having an overall particle size distribution such that about 20% of the particles are finer than 0.2 μm, about 60% of the particles are finer than 0.5 μm, and 95% of the particles are finer than 2 μm. ### Claim 13 (depends on 12) The paper of claim 12 wherein the topcoat comprises a blend of pigments having different particle size distributions, the pigments being selected and provided in relative proportions so as to provide the overall particle size distribution. ### Claim 14 (depends on 1) The paper of claim 1 wherein the topcoat has an external pigment pore structure with a peak mean pore diameter finer than about 0.12 μm. ### Claim 15 (depends on 14) The paper of claim 14 wherein the topcoat has an external pigment pore structure with a peak mean pore diameter finer than about 0.10 μm. ### Claim 16 (depends on 1) The paper of claim 1 wherein the topcoat is substantially free of absorbent materials. ### Claim 17 A paper comprising: a basesheet; a penultimate coating layer comprising (a) a filler having a high internal pore volume; and (b) a pigment or pigment blend having an overall particle size distribution such that about 25% of the particles are finer than 0.2 μm, about 50% of the particles are finer than 0.5 μm, and about 70% of the particles are finer than 2 μm; and a porous topcoat, disposed directly adjacent the penultimate coating layer and having a surface exposed to receive a printed image. ### Claim 18 (depends on 17) The paper of claim 17 wherein the penultimate coating further comprises a component having high ink vehicle interactivity. ### Claim 19 (depends on 17) The paper of claim 17 wherein the penultimate coating layer has an external pigment pore structure with a peak mean pore diameter finer than 0.20 μm. ### Claim 20 (depends on 17) The paper of claim 17 wherein the topcoat has an external pigment pore structure with a peak mean pore diameter finer than about 0.12 μm. ### Claim 21 (depends on 20) The paper of claim 20 wherein the topcoat has an external pigment pore structure with a peak mean pore diameter finer than about 0.10 μm. ### Claim 22 (depends on 17) The paper of claim 17 wherein the topcoat is substantially free of absorbent materials.