	US 12,435,472 B2
	Surface size composition and its use
Anneli Lepo, Espoo (FI); and Paula Hirsilä, Espoo (FI)
Assigned to KEMIRA OYJ, Helsinki (FI)
Appl. No. 18/024,622
Filed by KEMIRA OYJ, Helsinki (FI)
PCT Filed Sep. 16, 2021, PCT No. PCT/FI2021/050613 § 371(c)(1), (2) Date Mar. 3, 2023, PCT Pub. No. WO2022/058656, PCT Pub. Date Mar. 24, 2022.
Claims priority of application No. 20205903 (FI), filed on Sep. 18, 2020.
Prior Publication US 2023/0366153 A1, Nov. 16, 2023
Int. Cl. D21H 21/16 (2006.01); D21H 17/23 (2006.01); D21H 17/28 (2006.01); D21H 17/66 (2006.01)

CPC D21H 21/16 (2013.01) [D21H 17/23 (2013.01); D21H 17/28 (2013.01); D21H 17/66 (2013.01)]

20 Claims

1. A surface size composition for surface sizing of paper or board, wherein the composition comprises at least an aluminium compound and an anionic lignin-carbohydrate complex, where lignin and carbohydrate are covalently bound with each other, and wherein the lignin-carbohydrate complex has a weight average molecular weight MW>12 000 g/mol.