# US 8,771,811 B2 · Ink-jet recording material

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- Number: US 8,771,811 B2
- Document ID: US8771811B2
- Status: Granted
- Kind: B2
- Application number: 13/471,729
- Filed: 2012-05-15
- Published: 2012-09-06
- Granted: 2014-07-08
- Earliest claimed: 2005-01-28
- Assignees: Oji Holdings Corporation
- Applicants: Tomomi Takahashi; Ryu Kitamura; Takehiko Kishimoto; Hideo Mitsui; Shigeru Suzuki
- Inventors: Tomomi Takahashi; Ryu Kitamura; Takehiko Kishimoto; Hideo Mitsui; Shigeru Suzuki
- Web page: https://patentgrep.com/patent/US8771811B2

## CPC

- B41M 5/506: {Intermediate layers}
- B41M 5/5218: {characterised by inorganic additives, e.g. pigments, clays}
- 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)

## Abstract

The present invention provides an ink-jet recording material containing: a support; and at least two ink-receiving layers of an ink-receiving underlayer and an ink-receiving top layer, the ink-receiving layers containing a pigment and a binder and being disposed on the support; characterized in that the ink-receiving top layer contains: a finely agglomerated pigment with an average particle diameter of 0.008 to 0.7 μm, selected from the group consisting of a silica, an alumina, and an alumina hydrate; and a coarse-grained pigment with an average particle diameter of 1 to 30 μm, the coarse-grained pigment being contained in an amount of 1 to 15 parts by mass with respect to 100 parts by mass of the finely agglomerated pigment.

## Claims

### Claim 1

An ink-jet recording material comprising:
a support; and
at least two ink-receiving layers of an ink-receiving underlayer and an ink-receiving top layer, wherein the ink-receiving underlayer and the ink-receiving top layer are disposed on the support and each comprises a pigment and a binder, wherein
the ink-receiving top layer comprises a finely agglomerated pigment with an average particle diameter of 0.01 to 0.7 μm; and a coarse-grained pigment with an average particle diameter of 1.5 to 15 μm, in the amount of 1 to 15 parts by mass with respect to 100 parts by mass of the finely agglomerated pigment,
wherein the finely agglomerated pigment in the ink-receiving top layer is agglomerated fine particles comprising a silica and a cationic compound prepared by mixing a fumed silica with a cationic compound to obtain agglomerated particles comprising the silica and the cationic compound, followed by pulverizing and dispersing the agglomerated particles comprising the silica and the cationic compound to a particle size within the range of 0.01 to 0.7 μm,
wherein the main component of the binder contained in the ink-receiving top layer is a polyvinyl alcohol;
the ink-receiving top layer further comprises a compound that is cross-linkable with a polyvinyl alcohol;
the pigment in the ink-receiving underlayer is a wet process silica and the binder in the ink-receiving underlayer is a latex binder; and
the main component of the binder contained in the ink-receiving underlayer is an emulsion latex.

### Claim 2 (depends on 1)

The ink-jet recording material according to claim 1, wherein the ink-receiving top layer is a layer formed by applying and drying a coating liquid comprising an aqueous dispersion of a mixture of the coarse-grained pigment and a cationic compound; and an aqueous dispersion of the finely agglomerated pigment.

### Claim 3 (depends on 1)

The ink-jet recording material according claim 1, wherein a surface of the ink-jet recording material has a whiteness degree of 80 to 90% as measured in accordance with JIS P8148; a sensory chromaticity index a* of −1 to 2; and a sensory chromaticity index b* of −2.5 to 1.5 as measured in accordance with JIS P8722.

### Claim 4 (depends on 1)

The ink-jet recording material according to claim 1, wherein at least one layer is selected from the group consisting of the ink-receiving underlayer, the ink-receiving top layer, an undercoat layer optionally formed between the support and the ink-receiving underlayer, and an intermediate layer optionally formed between the ink-receiving underlayer and the ink-receiving top layer comprises a coloring agent selected from the group consisting of colored pigments and colored dyes.