# US 10,870,301 B2 · Combination of thermal transfer sheet and seal-type printing sheet, and thermal transfer sheet

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- Number: US 10,870,301 B2
- Document ID: US10870301B2
- Status: Granted
- Kind: B2
- Application number: 16/486,918
- Filed: 2018-03-01
- Published: 2020-07-23
- Granted: 2020-12-22
- Earliest claimed: 2017-03-01
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Tadahiro Ishida
- Web page: https://patentgrep.com/patent/US10870301B2

## CPC

- B41M 5/38228: {characterised by the use of two or more ink layers}
- B41M 5/392: Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
- B41J 31/00: Ink ribbons; Renovating or testing ink ribbons
- G09F 3/02: Forms or constructions (layered products B32B)
- G09F 3/10: by an adhesive layer
- B41M 5/382: Contact thermal transfer or sublimation processes (sublistatic printing using a pre-formed image B41M5/035; ink-, dye- or pigment-receptive coatings B41M5/52)
- B41M 5/395: Macromolecular additives, e.g. binders
- B41M 5/41: Base layers {supports or substrates}
- B41M 5/42: Intermediate, {backcoat}, or covering layers {(B41M5/405 takes precedence; multilayer thermal transfer systems in general B41M5/38214)}
- B41M 2205/02: Dye diffusion thermal transfer printing (D2T2)
- B41M 2205/06: relating to melt (thermal) mass transfer
- 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)
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS

## Abstract

Provided is a combination of a thermal transfer sheet and a seal-type printing sheet, the combination being capable of preventing occurrence of wrinkles in a print. In a combination of a thermal transfer sheet including a substrate and a colorant layer provided on one surface of the substrate and a seal-type printing sheet including a releasing substrate and a printing paper sheet with a pressure-sensitive adhesive layer provided on a portion of one surface of the releasing substrate, the difference between the dynamic friction coefficient between the colorant layer in the thermal transfer sheet and the printing paper sheet with a pressure-sensitive adhesive layer in the seal-type printing sheet and the dynamic friction coefficient between the colorant layer in the thermal transfer sheet and the releasing substrate in the seal-type printing sheet is 1.0 or less.

## Claims

### Claim 1

A combination of:
a thermal transfer sheet comprising a substrate and a colorant layer provided on one surface of the substrate; and
a seal-type printing sheet comprising a releasing substrate and a printing paper sheet with a pressure-sensitive adhesive layer provided on a portion of one surface of the releasing substrate;
wherein a difference between a dynamic friction coefficient between the colorant layer in the thermal transfer sheet and the printing paper sheet with a pressure-sensitive adhesive layer in the seal-type printing sheet and a dynamic friction coefficient between the colorant layer in the thermal transfer sheet and the releasing substrate in the seal-type printing sheet is 1.0 or less.

### Claim 2 (depends on 1)

The combination of a thermal transfer sheet and a seal-type printing sheet according to claim 1, wherein an organic filler is contained in the colorant layer in the thermal transfer sheet at a content of 2% by mass or more and 6% by mass or less based on the total mass of the colorant layer.

### Claim 3 (depends on 2)

The combination of a thermal transfer sheet and a seal-type printing sheet according to claim 2, wherein the organic filler has an average particle size of 1.0 μm or more and 2.5 μm or less.