# US 7,744,959 B2 · Ink-jet recording medium for dye- or pigment-based ink-jet inks

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- Number: US 7,744,959 B2
- Document ID: US7744959B2
- Status: Granted
- Kind: B2
- Application number: 12/122,971
- Filed: 2008-05-19
- Published: 2008-09-11
- Granted: 2010-06-29
- Earliest claimed: 2004-05-26
- Assignees: Hewlett-Packard Development Company, L.P.
- Inventors: Yubai Bi; Tienteh Chen; Eric Lee Burch; Sandeep Bangaru; Kimberly Zargarian
- Web page: https://patentgrep.com/patent/US7744959B2

## CPC

- B41M 5/52: Macromolecular coatings
- B41M 5/506: {Intermediate layers}
- 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 5/5254: {characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers}
- B41M 5/529: {characterised by the use of fluorine- or silicon-containing organic compounds}
- B41M 2205/12: Preparation of material for subsequent imaging, e.g. corona treatment, simultaneous coating, pre-treatments
- B41M 2205/38: Intermediate layers; Layers between substrate and imaging layer
- Y10T 428/249953: Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T 428/254: Polymeric or resinous material
- Y10T 428/259: Silicic material
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T 428/2955: Silicic material in coating
- Y10T 428/2967: Synthetic resin or polymer
- Y10T 428/2969: Polyamide, polyimide or polyester
- Y10T 428/2993: Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
- 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

The present invention is drawn to a method of preparing a porous media substrate, comprising combining metal or semi-metal oxide particulates with a polymeric binder, wherein the metal or semi-metal oxide particulates are associated with at least one water soluble coating formulation additive. At least a portion of the water soluble coating formulation additive i) is in the form of unreacted additive, or ii) generates undesired electrolytes. Additional steps include removing at least a portion of the unreacted additive or undesired electrolytes, either before or after combining the metal or semi-metal oxide particulates with the polymeric binder, thereby forming a refined coating composition; and applying the refined coating composition to a media substrate to form an ink-receiving layer having a porous surface.

## Claims

### Claim 1

A method of preparing a porous media substrate, comprising:
forming an aqueous dispersion comprising at least one water soluble coating formulation additive comprising aluminum chlorohydrate;
adding 30-100 nm silica or alumina particulates to said additive dispersion, to form a dispersion comprising unflocculated silica or alumina particulates associated with said additive, and comprising unreacted additive or undesired electrolytes;
combining a polymeric binder with said additive-associated silica or alumina particulates;
removing at least 25-75% of the unreacted additive or undesired electrolytes; and
applying a refined coating composition comprising said additive-associated metal or semi-metal oxide particulates and said binder to a media substrate to form an ink-receiving layer having a glossy porous surface and enhanced compatibility with inkjet ink components.

### Claim 2 (depends on 1)

The method of claim 1, wherein the binder includes a member selected from the group consisting of polyvinyl alcohol, modified polyvinyl alcohol, and combinations thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein the water soluble coating formulation additive includes an ionic organosilane reagent, said ionic organosilane reagent including an amine moiety.

### Claim 4 (depends on 1)

The method of claim 1, wherein the water soluble coating formulation additive includes an acidic component comprising an acidic crosslinking agent.

### Claim 5 (depends on 4)

The method of claim 4, wherein the acidic crosslinking agent is boric acid.

### Claim 6 (depends on 1)

The method of claim 1, further comprising adding to said refined coating composition an air fade additive configured to improve air fade resistance of an image printed on the porous surface.

### Claim 7 (depends on 6)

The method of claim 6, wherein the air fade additive is selected from the group consisting of hindered amines, thio compounds, and combinations thereof.

### Claim 8 (depends on 1)

The method of claim 1, wherein the step of removing comprises a process selected from the group consisting of ultrafiltration, dialysis, ion exchange, reverse osmosis, and combination of process thereof.

### Claim 9 (depends on 8)

The method of claim 8, wherein the step of removing comprises ultrafiltration.

### Claim 10 (depends on 9)

The method of claim 9, wherein the ultrafiltration is carried out using a porous filter having an average pore size from 20 nm to 100 nm.

### Claim 11 (depends on 1)

The method of claim 1, wherein the porous surface has a pH from about 4 to about 7.5.

### Claim 12 (depends on 11)

The method of claim 11, wherein the porous surface has a pH from about 5 to about 6.

### Claim 13 (depends on 1)

The method of claim 1, wherein the step of removing occurs prior to combining the silica or alumina particulates with the polymeric binder.

### Claim 14 (depends on 1)

The method of claim 1, wherein, after the applying step, the porous surface is subsequently coated with a second coating that is substantially devoid of water soluble coating formulation additive.

### Claim 15 (depends on 1)

The method of claim 1, wherein the media substrate includes an inorganic porous media precoat, and wherein the step of applying the refined coating composition to the media substrate comprises overcoating the precoat.

### Claim 16 (depends on 1)

The method of claim 1, further comprising the step of washing the ink-receiving layer.

### Claim 17 (depends on 16)

The method of claim 16, wherein the washing step removes additional unreacted or excess additive or undesired electrolytes.

### Claim 18 (depends on 1)

The method of claim 1 wherein said removing comprises removing at least a portion of the unreacted additive or undesired electrolytes after combining the silica or alumina particulates with the polymeric binder.