# US 8,784,954 B2 · Recording medium

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- Number: US 8,784,954 B2
- Document ID: US8784954B2
- Status: Granted
- Kind: B2
- Application number: 14/050,981
- Filed: 2013-10-10
- Published: 2014-04-17
- Granted: 2014-07-22
- Earliest claimed: 2012-10-11
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Yasuhiro Nito; Hisao Kamo; Naoya Hatta
- Web page: https://patentgrep.com/patent/US8784954B2

## CPC

- B41M 5/502: {characterised by structural details, e.g. multilayer materials (supports, backcoats or intermediate layers for thermal dye transfer donor and receiver sheets B41M5/41, B41M5/42)}
- B41M 5/506: {Intermediate layers}
- B41M 5/508: {Supports}
- B41M 5/52: Macromolecular coatings
- B41M 5/5218: {characterised by inorganic additives, e.g. pigments, clays}
- B41M 5/5254: {characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers}
- B41M 2205/42: Multiple imaging layers
- 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

A recording medium includes, in sequence, a support; a first ink-receiving layer including an inorganic particle, a water-soluble polymer having a hydroxyl group, a water-soluble polymer not having a hydroxyl group, and a boric acid compound; and a second ink-receiving layer including an inorganic particle, a water-soluble polymer having a hydroxyl group, and a boric acid compound. The second ink-receiving layer does not include the water-soluble polymer not having the hydroxyl group, or the second ink-receiving layer includes the water-soluble polymer not having the hydroxyl group but the content of the water-soluble polymer not having the hydroxyl group relative to that of the inorganic particle in the second ink-receiving layer is smaller than the content of the water-soluble polymer not having the hydroxyl group relative to that of the inorganic particle in the first ink-receiving layer.

## Claims

### Claim 1

A recording medium comprising:
a support;
a first ink-receiving layer; and
a second ink-receiving layer in that order,
wherein the first ink-receiving layer includes an inorganic particle, a water-soluble polymer having a hydroxyl group, a water-soluble polymer not having a hydroxyl group, and a boric acid compound, and
the second ink-receiving layer includes an inorganic particle, a water-soluble polymer having a hydroxyl group, and a boric acid compound, and satisfies a condition (1) or (2) below:
Condition (1): The second ink-receiving layer does not include the water-soluble polymer not having the hydroxyl group.
Condition (2): The second ink-receiving layer includes the water-soluble polymer not having the hydroxyl group, but the content of the water-soluble polymer not having the hydroxyl group relative to the content of the inorganic particle in the second ink-receiving layer is smaller than the content of the water-soluble polymer not having the hydroxyl group relative to the content of the inorganic particle in the first ink-receiving layer.

### Claim 2 (depends on 1)

The recording medium according to claim 1, wherein, in the first ink-receiving layer, a mass ratio of the content of the water-soluble polymer having the hydroxyl group to the content of the inorganic particle is 5.0% by mass or more and 17.0% by mass or less.

### Claim 3 (depends on 1)

The recording medium according to claim 1, wherein, in the first ink-receiving layer, a mass ratio of the content of the water-soluble polymer not having the hydroxyl group to the content of the inorganic particle is 1.0% by mass or more and 15.0% by mass or less.

### Claim 4 (depends on 1)

The recording medium according to claim 1, wherein, in the first ink-receiving layer, the content (% by mass) of the water-soluble polymer not having the hydroxyl group is 0.1 times or more and 3.0 times or less the content (% by mass) of the water-soluble polymer having the hydroxyl group in terms of mass ratio.

### Claim 5 (depends on 1)

The recording medium according to claim 1, wherein the water-soluble polymer having the hydroxyl group is at least one selected from polyvinyl alcohol and polyvinyl alcohol derivatives.

### Claim 6 (depends on 1)

The recording medium according to claim 1, wherein the water-soluble polymer not having the hydroxyl group is at least one selected from polyvinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyethylene oxide, and polyacrylamide.

### Claim 7 (depends on 1)

The recording medium according to claim 1, wherein the water-soluble polymer having the hydroxyl group has a hydroxyl value of 500 mgKOH/g or more, and the water-soluble polymer not having the hydroxyl group has a hydroxyl value of 50 mgKOH/g or less.

### Claim 8 (depends on 1)

The recording medium according to claim 1, wherein the inorganic particle includes at least one selected from hydrated alumina, alumina, and silica.