US 11,752,793 B2
Heat-sensitive recording material
Nadia El-Karzazi, Bielefeld (DE); and Claas Boxhammer, Herford (DE)
Assigned to MITSUBISHI HITEC PAPER EUROPE GMBH, Bielefeld (DE)
Appl. No. 16/966,323
Filed by Mitsubishi HiTec Paper Europe GmbH, Bielefeld (DE)
PCT Filed Jan. 31, 2019, PCT No. PCT/EP2019/052349
§ 371(c)(1), (2) Date Jul. 30, 2020,
PCT Pub. No. WO2019/149806, PCT Pub. Date Aug. 8, 2019.
Claims priority of application No. 10 2018 102 180.0 (DE), filed on Jan. 31, 2018.
Prior Publication US 2020/0369062 A1, Nov. 26, 2020
Int. Cl. B41M 5/333 (2006.01); B41M 5/42 (2006.01); B41M 5/327 (2006.01); B41M 5/44 (2006.01)
CPC B41M 5/3333 (2013.01) [B41M 5/3275 (2013.01); B41M 5/426 (2013.01); B41M 5/443 (2013.01); B41M 2205/04 (2013.01); B41M 2205/38 (2013.01); B41M 2205/40 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A heat-sensitive recording material comprising:
a substrate, which is a web-form substrate, having a front side and a reverse side opposite the front side;
a heat-sensitive recording layer disposed on the front side of the web-form substrate, the heat-sensitive recording layer comprising:
at least one dye precursor; and
at least one color developer that is reactive with the at least one dye precursor and is
a) a compound of a formula (I):

OG Complex Work Unit Chemistry

OG Complex Work Unit Chemistry
an interlayer disposed between the substrate and the heat-sensitive recording layer and comprising calcined aluminum silicate; and
a mass fraction of the calcined aluminum silicate in the interlayer being 50 to 90%, based on a total mass of solids in the interlayer,
wherein the compound of the formula (I) is in a crystalline form in which an IR spectrum has an absorption band at 3401±20 cm−1.