# US 7,745,525 B2 · Waterfast dye fixative compositions for ink jet recording sheets > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,745,525 B2 - Document ID: US7745525B2 - Status: Granted - Kind: B2 - Application number: 12/228,885 - Filed: 2008-08-15 - Published: 2009-02-26 - Granted: 2010-06-29 - Earliest claimed: 2002-06-10 - Assignees: International Paper Company - Inventors: Michael F Koenig - Web page: https://patentgrep.com/patent/US7745525B2 ## CPC - B41M 5/0011: {Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating (after-treatment of prints B41M7/00; printers for treating or overcoating copy materials before, during or after printing B41J11/0015)} - B41M 5/52: Macromolecular coatings - B41M 5/5245: {characterised by the use of polymers containing cationic or anionic groups, e.g. mordants} - B41M 5/508: {Supports} - B41M 5/5218: {characterised by inorganic additives, e.g. pigments, clays} - B41M 5/5227: {characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants} - B41M 5/5236: {characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose} - B41M 5/5254: {characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers} - B41M 5/5281: {Polyurethanes or polyureas} - Y10T 428/31681: Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.] - Y10T 428/31692: Next to addition polymer from unsaturated monomers - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A coating composition comprising a blend of at least two dye fixatives, at least one of which is a cationic polymer, and at least one of the other dye fixatives is a polyvalent metal salt, to form a water-insoluble complex. The ink recording sheets comprise a composition that is absorbed into the surface of the substrate as a sizing material, or alternatively, forms a continuous layer on the substrate. The present invention also encompasses methods for making the ink jet recording sheets. ## Claims ### Claim 1 A method for making an ink jet recording sheet, comprising: preparing, under acidic conditions, a composition comprising a water-soluble blend of at least two dye fixatives, wherein at least one of said dye fixatives is a cationic polymer and the other of said dye fixatives is a polyvalent metal salt; contacting said composition with a base to raise the pH of said composition and form a water-insoluble complex from said blend; contacting said water-insoluble complex with a starch, to form a sizing composition; and coating at least one surface of a substrate with the sizing composition. ### Claim 2 (depends on 1) The method according to claim 1, wherein said coating comprises forming a continuous film of said sizing composition on said substrate surface. ### Claim 3 (depends on 1) The method according to claim 1, wherein, upon said coating, said composition is absorbed into the surface of said substrate as a sizing material. ### Claim 4 (depends on 1) The method according to claim 1, further comprising, prior to contacting with said base, contacting said composition with a material selected from the group consisting of binders, pore volume regulators, pigments, defoamers, surfactants, thickeners, and a combination of at least two of the materials. ### Claim 5 (depends on 1) The method of claim 1, further comprising, after contacting with said base, and prior to said coating, contacting said composition with a material selected from the group consisting of binder, pore volume regulator, pigment, defoamer, surfactant, thickener, and a combination of at least two of the materials. ### Claim 6 (depends on 1) The method according to claim 1, wherein the cationic polymer is selected from the group consisting of dicyandiamide-formaldehyde resin, polyethylenimine-epichlorohydrin, polydiallyldimethylammonium chloride, and cationic polymer which contains primary, secondary, tertiary or quaternary amine functionalities. ### Claim 7 (depends on 6) The method according to claim 6, wherein said cationic polymer which contains amine functionalities is selected from the group consisting of cationic starches, cationic polyvinyl alcohols, cationic vinyl polymers, cationic styrene-containing polymers, cationic polyurethanes, and quaternary amine salts. ### Claim 8 (depends on 1) The method according to claim 1, wherein the polyvalent metal salt is a water-soluble salt comprising an element selected from the group consisting of aluminum, magnesium, zinc, manganese, copper, cobalt, tin, nickel, chromium, zirconium, and iron. ### Claim 9 (depends on 1) The method according to claim 1, wherein the polyvalent metal salt is a polyaluminum chloride. ### Claim 10 (depends on 9) The method according to claim 9, wherein the polyaluminum chloride is aluminum chlorohydrate. ### Claim 11 (depends on 1) The method according to claim 1, wherein the cationic polymer is dicyandiamide-formaldehyde resin and the polyvalent metal salt is aluminum chlorohydrate. ### Claim 12 (depends on 11) The method according to claim 11, wherein the weight ratio of aluminum chlorohydrate to dicyandiamide-formaldehyde resin is in the range of 1:20 to 1:1. ### Claim 13 (depends on 12) The method according to claim 12, wherein the weight ratio of aluminum chlorohydrate to dicyandiamide-formaldehyde resin is 1:2. ### Claim 14 (depends on 1) The method according to claim 1, wherein said substrate is selected from the group consisting of paper, textile and plastic film. ### Claim 15 (depends on 1) The method according to claim 1, wherein said composition further comprises a material selected from the group consisting of binders, pigments, pore volume regulators, defoamers, surfactants, thickeners, and a combination of at least two of the materials. ### Claim 16 (depends on 15) The method according to claim 15, wherein said binders are selected from the group consisting of starch, derivatives of starch, cross linked polyvinyl alcohol, cross-linked derivatives of polyvinyl alcohol, modified polyvinyl alcohol, modified cellulosics, proteins, vinyl polymers, styrene-containing polymers, and polyurethanes. ### Claim 17 (depends on 15) The method according to claim 15, wherein said pigment is selected from the group consisting of silica, alumina, clay, and calcium carbonate. ### Claim 18 (depends on 1) The method according to claim 1, further comprising raising the pH to between 6 and 8. ### Claim 19 (depends on 1) The method according to claim 1, further comprising forming a coated paper, matte type paper, or glossy type paper. ### Claim 20 (depends on 1) The method according to claim 1, further comprising printing an image onto the recording sheet.