US 11,945,250 B2
Thermal transfer sheet and printed article
Yuuki Iwasaki, Tokyo (JP)
Assigned to Dai Nippon Printing Co., Ltd., Tokyo (JP)
Appl. No. 17/905,430
Filed by Dai Nippon Printing Co., Ltd., Tokyo (JP)
PCT Filed Mar. 5, 2021, PCT No. PCT/JP2021/008725
§ 371(c)(1), (2) Date Sep. 1, 2022,
PCT Pub. No. WO2021/182333, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2020-043313 (JP), filed on Mar. 12, 2020; and application No. 2020-043315 (JP), filed on Mar. 12, 2020.
Prior Publication US 2023/0110518 A1, Apr. 13, 2023
Int. Cl. B41M 5/30 (2006.01); B41M 5/382 (2006.01); B41M 5/385 (2006.01); B41M 5/395 (2006.01); B41M 5/42 (2006.01)
CPC B41M 5/3858 (2013.01) [B41M 5/38235 (2013.01); B41M 5/385 (2013.01); B41M 5/395 (2013.01); B41M 5/42 (2013.01); B41M 2205/02 (2013.01); B41M 2205/40 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A thermal transfer sheet comprising a dye layer disposed on a first surface of a substrate film, wherein
the dye layer includes a decolorizable dye and a light-fast dye that is more light-fast than the decolorizable dye,
the decolorizable dye has a color difference ΔE*ab between a color A and a color B of 10 or less, where the color A is a color of a transfer-receiving body before the decolorizable dye is transferred to the transfer-receiving body, the color B is a color of a portion of the transfer-receiving body with the decolorizable dye having been transferred thereto, and the color of the portion is a color after the portion is irradiated by a xenon lamp at an irradiation intensity of 1.2 (W/m2) for 50 hours, the portion having a reflection density of 0.5 or greater before being irradiated by the xenon lamp, and
the decolorizable dye is at least one of a compound represented by structural formula (1) below, a compound represented by structural formula (2) below, a compound represented by structural formula (3) below, and a compound represented by structural formula (4) below:

OG Complex Work Unit Chemistry