Ink-jet recording sheet

• US 6,037,050 A
• Filed: 10/17/1997
• Issued: 03/14/2000
• Est. Priority Date: 10/25/1996
• Status: Expired due to Term

• Current Assignee: Konica Corporation (Konica Minolta Inc.)
• Original Assignee: Konica Corporation (Konica Minolta Inc.)
• Inventors: Mochizuki, Yoshihiro, Saito, Yoichi, Tsuchiya, Masaru
• Primary Examiner(s): Schwartz, Pamela R.
• Application Number:
  US08/953,620
• Time in Patent Office: 879 Days
• Field of Search: 428/195, 428/520, 428/331, 428/304.4, 428/341, 428/342, 428/323, 428/522
• US Class Current: 428/32.26
• CPC Class Codes: B41M 5/504 Backcoats
• CPC Class Codes: B41M 5/506 Intermediate layers
• CPC Class Codes: B41M 5/508 Supports
• 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 5/5227 characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants
• CPC Class Codes: B41M 5/5245 characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
• CPC Class Codes: B41M 5/5254 characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/273 of coating
• CPC Class Codes: Y10T 428/277 Cellulosic substrate
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

An ink-jet recording sheet comprises a support, and provided thereon, a void layer containing fine inorganic particles and a hydrophilic binder, the hydrophilic binder having being cross-linked by a hardener.

Claims

1. An ink-jet recording sheet comprising a hydrophobic support, and provided thereon, a void layer containing fine inorganic particles in secondary order particle form in an amount of 1 to 30 g/m² and a hydrophilic binder in an amount of 0.2 to 10 g/m², the fine inorganic particles having an average secondary order particle size of 0.02 to 0.2 μ

m and the hydrophilic binder having been cross-linked by a hardener, wherein the dry thickness of the void layer is 15 to 50 μ

m and the content ratio by weight of the hydrophilic binder to the fine inorganic particles is 1;

15 to 1;

1.

2. The ink-jet recording sheet of claim 1, wherein the void layer contains the fine inorganic particles in an amount of 5 to 20 g/m² and the hydrophilic binder in an amount of 0.5 to 5 g/m².

3. The ink-jet recording sheet of claim 1, wherein the hydrophilic binder is a polyvinyl alcohol or a cation-modified polyvinyl alcohol.

4. The ink-jet recording sheet of claim 3, wherein the polyvinyl alcohol or cation-modified polyvinyl alcohol has an average polymerization degree of 1,000 to 4,000.

5. The ink-jet recording sheet of claim 3, wherein the saponification degree of the polyvinyl alcohol is 80 to 100 mol %, and the saponification degree of the cation-modified polyvinyl alcohol is 70 to 99 mol %.

6. The ink-jet recording sheet of claim 1, wherein the fine inorganic particles have an average primary order particle size of 0.003 to 0.05 μ

m.

7. The ink-jet recording sheet of claim 1, wherein the fine inorganic particles are silica particles having an average primary order particle size of 0.006 to 0.015 μ

m.

8. The ink-jet recording sheet of claim 1, wherein the hardener is boric acid or its salt or a polyepoxy compound.

9. The ink-jet recording sheet of claim 8, wherein the hardener is boric acid or its salt.

10. The ink-jet recording sheet of claim 1, wherein the void layer further contains a polyol with a molecular weight of not more than 300 having at least two hydroxy groups in the molecules.

11. The ink-jet recording sheet of claim 10, wherein the polyol content of the void layer is 0.01 to 2 g based on 1 g of the hydrophilic binder used.

12. The ink-jet recording sheet of claim 1, wherein the dry thickness of the void layer is 20 to 50 μ

m.

13. The ink-jet recording sheet of claim 1, wherein the void volume of the void layer is 13 to 30 ml/m².

14. The ink-jet recording sheet of claim 1, wherein the fine inorganic particles are flocculated.

15. The ink-jet recording sheet of claim 1, wherein the content ratio by weight of the hydrophilic binder to the fine inorganic particles is 1:

10 to 1;

2.

16. The ink-jet recording sheet of claim 15, wherein

the void volume of the void layer is 13 to 30 ml/m² ;

the void layer contains the fine inorganic particles in an amount of 5 to 20 g/m² and the hydrophilic binder in an amount of 0.5 to 5 g/m² ; and

the fine inorganic particles have an average primary order particle size of 0.003 to 0.05 μ

m.

17. The ink-jet recording sheet of claim 16, wherein the hydrophobic support is selected from a resin film or plate of a polyester resin, a diacetate resin, a triacetate resin, an acyl resin, a polycarbonate resin, a polyvinyl chloride resin, a polyimide resin, cellophane, celluloid or a glass plate.

18. The ink-jet recording sheet of claim 16, wherein the hydrophobic support is i) a paper having located on at least one surface, a polyolefin resin containing white pigment or ii) a polyethylene or a polyethylene terephthalate sheet containing white pigment.

19. The ink-jet recording sheet of claim 1, wherein the hydrophobic support is selected from a resin film or plate of a polyester resin, a diacetate resin, a triacetate resin, an acyl resin, a polycarbonate resin, a polyvinyl chloride resin, a polyimide resin, cellophane, celluloid or a glass plate.

20. The ink-jet recording sheet of claim 1, wherein the hydrophobic support is i) a paper having located on at least one surface, a polyolefin resin containing white pigment or ii) a polyethylene or a polyethylene terephthalate sheet containing white pigment.