# US 10,500,883 B2 · Combination of intermediate transfer sheet and thermal transfer medium, and print forming method

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- Number: US 10,500,883 B2
- Document ID: US10500883B2
- Status: Granted
- Kind: B2
- Application number: 16/077,816
- Filed: 2017-02-23
- Published: 2019-05-30
- Granted: 2019-12-10
- Earliest claimed: 2016-02-25
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Shinya Yoda; Emi Matsuba
- Web page: https://patentgrep.com/patent/US10500883B2

## CPC

- B41M 5/38214: {Structural details, e.g. multilayer systems (composition of individual layers B41M5/42)}
- B32B 7/06: permitting easy separation
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/40: comprising polyurethanes
- B41J 2/0057: {where an intermediate transfer member receives the ink before transferring it on the printing material}
- B41J 2/325: by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
- B41M 5/42: Intermediate, {backcoat}, or covering layers {(B41M5/405 takes precedence; multilayer thermal transfer systems in general B41M5/38214)}
- B41M 5/44: characterised by the macromolecular compounds
- B41M 5/46: characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
- B41M 5/52: Macromolecular coatings
- B41M 5/392: Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
- B41M 5/41: Base layers {supports or substrates}
- B41M 5/426: {characterised by inorganic compounds, e.g. metals, metal salts, metal complexes}
- B41M 5/5236: {characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose}
- B41M 5/5254: {characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers}
- B41M 5/5272: {Polyesters; Polycarbonates}
- B41M 2205/30: Thermal donors, e.g. thermal ribbons
- B41M 2205/32: Thermal receivers
- B41M 2205/38: Intermediate layers; Layers between substrate and imaging layer
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A thermal transfer sheet and intermediate transfer medium, and a print forming method, capable of forming a thermal transfer image having good transferability when transferring a transfer layer including a receiving layer onto a transfer receiving article, and capable of improving the durability of a print obtained by transferring the transfer layer including the receiving layer, on which the thermal transfer image has been formed, onto a transfer receiving article. The thermal transfer sheet includes a substrate, primer layer and colorant layer, wherein the primer layer contains one or more selected from the group consisting of particles derived from colloidal inorganic particles, polyvinyl alcohol resins, polyvinyl pyrrolidone resins, and polyurethane resins. The intermediate transfer medium includes another substrate, a protective layer, and a receiving layer, wherein the protective layer and the receiving layer are layered in this order on one surface of the another substrate.

## Claims

### Claim 1

A combination of a thermal transfer sheet and an intermediate transfer medium,
the thermal transfer sheet comprising a substrate, a primer layer, and a colorant layer, wherein the primer layer and the colorant layer are layered in this order on one surface of the substrate, and wherein the primer layer contains one or more selected from the group consisting of particles derived from colloidal inorganic particles, polyvinyl alcohol resins, polyvinyl pyrrolidone resins, and polyurethane resins, and
the intermediate transfer medium comprising another substrate, a protective layer, and a receiving layer, wherein the protective layer and the receiving layer are layered in this order on one surface of the another substrate.

### Claim 2 (depends on 1)

The combination of a thermal transfer sheet and an intermediate transfer medium according to claim 1, wherein the receiving layer of the intermediate transfer medium contains a resin having a number average molecular weight (Mn) of not less than 6000 and not more than 35000.

### Claim 3 (depends on 1)

The combination of a thermal transfer sheet and an intermediate transfer medium according to claim 1, wherein the receiving layer of the intermediate transfer medium contains a resin having a glass transition temperature (Tg) of not less than 60° C. and not more than 100° C.

### Claim 4 (depends on 1)

The combination of a thermal transfer sheet and an intermediate transfer medium according to claim 1, wherein the receiving layer of the intermediate transfer medium contains a release agent in an amount of not more than 15% by mass on a basis of a total mass of the receiving layer.

### Claim 5

A print forming method comprising:
providing: a thermal transfer sheet comprising a substrate, a primer layer, and a colorant layer, wherein the primer layer and the colorant layer are layered in this order on one surface of the substrate; an intermediate transfer medium comprising another substrate, a protective layer, and a receiving layer, wherein the protective layer and the receiving layer are layered in this order on one surface of the another substrate; and a transfer receiving article;
forming a thermal transfer image: transferring a colorant contained in the colorant layer of the thermal transfer sheet onto the receiving layer of the intermediate transfer medium to form a thermal transfer image on the receiving layer; and
forming a print: transferring the receiving layer, on which the thermal transfer image has been formed, onto the transfer receiving article together with the protective layer,
wherein the primer layer of the thermal transfer sheet used to form the thermal transfer image contains one or more selected from the group consisting of particles derived from colloidal inorganic particles, polyvinyl alcohol resins, polyvinyl pyrrolidone resins, and polyurethane resins.

### Claim 6 (depends on 5)

The print forming method according to claim 5, wherein the receiving layer of the intermediate transfer medium contains a resin having a number average molecular weight (Mn) of not less than 6000 and not more than 35000.

### Claim 7 (depends on 5)

The print forming method according to claim 5, wherein the receiving layer of the intermediate transfer medium contains a resin having a glass transition temperature (Tg) of not less than 60° C. and not more than 100° C.

### Claim 8 (depends on 5)

The print forming method according to claim 5, wherein the receiving layer of the intermediate transfer medium contains a release agent in an amount of not more than 15% by mass on a basis of a total mass of the receiving layer.