Fine particle dispersion, coating solution for accepting layer for coloring agent for ink-jet recording sheet, ink-jet recording sheet using the dispersion, and method for producing fine particle dispersion

• US 7,495,041 B2
• Filed: 06/01/2005
• Issued: 02/24/2009
• Est. Priority Date: 04/01/2002
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Kobayashi, Takashi, Higashi, Shunsaku, Nakano, Ryoichi
• Primary Examiner(s): Cain; Edward J
• Application Number:
  US11/141,315
• Publication Number:
  US 20070003714A1
• Time in Patent Office: 1,364 Days
• Field of Search: 523/160, 523/161
• US Class Current: 523/160
• CPC Class Codes: B41M 5/52 Macromolecular coatings
• CPC Class Codes: B41M 5/5218 characterised by inorganic additives, e.g. pigments, clays
• CPC Class Codes: B41M 5/5236 characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
• CPC Class Codes: B41M 5/5245 characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
• CPC Class Codes: C08J 3/205 in the presence of a continuous liquid phase

Abstract

The present invention provides an ink-jet recording sheet having a coloring agent accepting layer which contains a dispersion containing a cationic polymer with an average molecular weight of 60,000 or lower and having a sulfate ion concentration of 1.5% by mass or lower to the cationic polymer together with a water-soluble resin; an particle dispersion obtained by further granulating a pre-dispersion obtained by pre-dispersing a solution containing at least fine particles and a cationic polymer and the pre-dispersion and/or the particle dispersion is heated at room temperature for 5 hours or longer after pre-dispersion and/or after granulating; and a coating solution for coloring agent accepting layer obtained by adding a water-soluble resin to the particle dispersion.

Claims

1. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet, wherein the coating solution is obtained by mixing a water-soluble resin with a particle dispersion, which is obtained by further granulating a pre-dispersion obtained by pre-dispersing a solution containing at least fine particles and a cationic polymer, and the pre-dispersion is left at room temperature for 5 hours or more after pre-dispersion and granulating.

3. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet according to claim 1, wherein the coating solution further contains a cross-linking agent capable of cross-linking the water-soluble resin.

5. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet according to claim 3, wherein the cross-linking agent is boric acid or a boron compound.

7. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet according to claim 1, wherein the cationic polymer is polydiallyldialkyl cationic polymer.

2. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet, wherein the coating solution is obtained by mixing a water-soluble resin with the particle dispersion which is obtained by further granulating a pre-dispersion obtained by pre-dispersing a solution containing at least fine particles and a cationic polymer, and the pre-dispersion is heated at a temperature higher than room temperature after pre-dispersion and before granulating.

4. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet according to claim 2, wherein the coating solution further contains a cross-linking agent capable of cross-linking the water-soluble resin.

6. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet according to claim 4, wherein the cross-linking agent is boric acid or a boron compound.

8. A coating solution for a coloring agent accepting layer of an ink-jet recording sheet according to claim 2, wherein the cationic polymer is polydiallyldialkyl cationic polymer.