Paper enhancement treatment with decreased calcium chloride

• US 9,056,515 B2
• Filed: 10/29/2010
• Issued: 06/16/2015
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Wingkono, Gracy A., Stoffel, John L., Zhou, Xiaogi
• Primary Examiner(s): Godenschwager, Peter F
• Application Number:
  US13/876,834
• Publication Number:
  US 20130224450A1
• Time in Patent Office: 1,691 Days
• Field of Search: 106/286.6, 811/9
• US Class Current: 1/1
• CPC Class Codes: B41M 5/0017 Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying
• CPC Class Codes: B41M 5/0035 Uncoated paper paper making D21
• CPC Class Codes: B41M 5/5218 characterised by inorganic additives, e.g. pigments, clays
• CPC Class Codes: C09D 1/00 Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• CPC Class Codes: D21H 17/66 Salts, e.g. alums
• CPC Class Codes: D21H 19/44 characterised by the other ingredients, e.g. the binder or dispersing agent
• CPC Class Codes: D21H 19/64 Inorganic compounds
• CPC Class Codes: D21H 21/16 Sizing or water-repelling agents
• CPC Class Codes: D21H 21/28 Colorants ; Pigments or opacifying agents
• CPC Class Codes: Y10T 428/24893 including particulate material

Abstract

An inkjet printable media comprises a paper base containing a surface coating comprising calcium chloride and a synergistic amount of a sulfate salt. When the printable media is printed with an inkjet ink containing a black pigment, a KOD value of the printed media is equal to or greater than that of a comparative inkjet printed media comprising up to 12 kg calcium chloride/T media and lacking the sulfate salt.

Claims

1. A composition for surface treating a raw paper base, comprising:

an aqueous liquid; and

a colorant fixative dissolved in said liquid, said colorant fixative comprising;

a chloride component comprising 2800 ppm to 5000 ppm by weight of a divalent chloride salt; and

a synergistic amount of a sulfate component comprising a salt having a sulfate anion, wherein said amount of said sulfate component synergistically enhances at least one print quality parameter of a paper base surface-treated with said composition, compared to a paper base surface-treated with said composition lacking said sulfate component;

wherein the salt having a sulfate anion is calcium sulfate; and

wherein the composition comprises 2800 ppm to 5000 ppm calcium chloride and about 70 ppm to about 150 ppm calcium sulfate.

2. The composition of claim 1, comprising at least one oxygen-containing compound dissolved in said liquid, wherein said dissolved oxygen-containing compound is present in an amount sufficient to enhance dissolution of said sulfate component in said liquid.

4. The composition of claim 1, comprising a sizing agent dissolved or dispersed in said aqueous liquid.

5. A method of making an inkjet printable media comprising:

applying the surface treatment composition of any one of claims 1,2,3 and 4 to the surface of a paper base, and

drying the surface-treated paper base, to provide an inkjet printable media containing about 1 Kg/T to about 8 Kg/T said chloride component and about 0.01 Kg/T to about 0.5 Kg/T said sulfate component per ton of printable media.

6. The method of claim 5, wherein said chloride-containing component is calcium chloride in an amount of about 2 Kg/T to about 4 Kg/T and said sulfate component is calcium sulfate in an amount of about 2 g/T to about 150 g/T per ton of printable media.

3. The composition of dam 2, wherein said at least one oxygen-containing compound is selected from the group consisting of polyvinyl alcohol and glycerol.