US 11,912,052 B2
Thermosensitive recording medium
Kentaro Kawasaki, Tokyo (JP); Yuka Murata, Tokyo (JP); Kenji Hirai, Tokyo (JP); and Yoshimi Midorikawa, Tokyo (JP)
Assigned to Nippon Paper Industries Co., Ltd.
Appl. No. 17/776,334
Filed by Nippon Paper Industries Co., Ltd., Tokyo (JP)
PCT Filed Nov. 11, 2020, PCT No. PCT/JP2020/042003
§ 371(c)(1), (2) Date May 12, 2022,
PCT Pub. No. WO2021/095751, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-204581 (JP), filed on Nov. 12, 2019; and application No. 2020-037464 (JP), filed on Mar. 5, 2020.
Prior Publication US 2022/0410610 A1, Dec. 29, 2022
Int. Cl. B41M 5/40 (2006.01); B41M 5/42 (2006.01); B41M 5/323 (2006.01); B41M 5/333 (2006.01); C09B 7/00 (2006.01); C09B 67/20 (2006.01); B41M 5/327 (2006.01); B41M 5/48 (2006.01)
CPC B41M 5/42 (2013.01) [B41M 5/323 (2013.01); B41M 5/333 (2013.01); B41M 5/3331 (2013.01); C09B 7/00 (2013.01); C09B 67/0065 (2013.01); B41M 5/327 (2013.01); B41M 5/3275 (2013.01); B41M 5/3333 (2013.01); B41M 5/48 (2013.01); B41M 2205/32 (2013.01)] 17 Claims
 
1. A thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer contains N-[2-(3-phenylureido)phenyl] benzenesulfonamide and an urea-based compound represented by the general formula 1 as the electron accepting color developing agents,

OG Complex Work Unit Chemistry
wherein R1 represents a substituted or unsubstituted alkyl group, aralkyl group or aryl group, and R2 represents a hydrogen atom or an alkyl group, and
wherein the content of N-[2-(3-phenylureido)phenyl] benzenesulfonamide is from 0.1 to 15.0 parts by weight per 1.0 part by weight of the urea-based compound represented by the general formula 1.