US 11,987,675 B2
Sheet
Koh Sakai, Chiba (JP); and Hayato Fushimi, Chiba (JP)
Assigned to OJI HOLDINGS CORPORATION, Tokyo (JP)
Appl. No. 16/955,534
Filed by OJI HOLDINGS CORPORATION, Tokyo (JP)
PCT Filed Dec. 18, 2018, PCT No. PCT/JP2018/046538
§ 371(c)(1), (2) Date Jun. 18, 2020,
PCT Pub. No. WO2019/124364, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. 2017-242941 (JP), filed on Dec. 19, 2017.
Prior Publication US 2021/0009771 A1, Jan. 14, 2021
Int. Cl. D21H 11/20 (2006.01); C08J 5/06 (2006.01); C08J 5/18 (2006.01); C08K 3/24 (2006.01); C08K 5/092 (2006.01); D21H 17/65 (2006.01); D21H 21/18 (2006.01)
CPC C08J 5/18 (2013.01) [C08J 5/06 (2013.01); C08K 3/24 (2013.01); C08K 5/092 (2013.01); D21H 11/20 (2013.01); D21H 17/65 (2013.01); D21H 21/18 (2013.01); C08J 2329/04 (2013.01); C08J 2371/02 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A sheet comprising cellulose fibers having a fiber width of 1000 nm or less, wherein
the cellulose fibers have anionic functional groups, and
the YI increase percentage calculated according to the following equation is 1500% or less:
YI increase percentage (%)=(yellowness of the sheet after heating−yellowness of the sheet before heating)/yellowness of the sheet before heating×100, wherein
the yellowness of the sheet after heating is a yellowness measured in accordance with JIS K 7373, after the sheet is subjected to hot pressing at 180° C. at 0.5 MPa for 1 minute, whereas the yellowness of the sheet before heating is a yellowness measured in accordance with JIS K 7373, before the sheet is subjected to the hot pressing.