US 12,325,809 B2
Composition for surface treating of steel sheet, steel sheet using same, and manufacturing method of same
Chang-Hoon Choi, Gwangyang-si (KR); Won-Ho Son, Pohang-si (KR); Chan-Seok Bang, Pohang-si (KR); and Jae-Duck Ko, Anyang-si (KR)
Assigned to POSCO, Pohang-si (KR); and NOROO COIL COATINGS CO., LTD., Pohang-si (KR)
Appl. No. 17/781,919
Filed by POSCO, Pohang-si (KR); and NOROO COIL COATINGS CO., LTD., Pohang-si (KR)
PCT Filed Dec. 3, 2020, PCT No. PCT/KR2020/017535
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/112583, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 10-2019-0158976 (KR), filed on Dec. 3, 2019.
Prior Publication US 2023/0019863 A1, Jan. 19, 2023
Int. Cl. C09D 7/61 (2018.01); B05D 7/14 (2006.01); C08K 3/36 (2006.01); C09D 4/00 (2006.01); C09D 5/08 (2006.01); C09D 7/20 (2018.01); C09D 7/40 (2018.01); C09D 7/63 (2018.01); C09D 183/06 (2006.01)
CPC C09D 7/61 (2018.01) [B05D 7/14 (2013.01); C09D 4/00 (2013.01); C09D 5/08 (2013.01); C09D 7/20 (2018.01); C09D 7/63 (2018.01); C09D 7/67 (2018.01); C09D 183/06 (2013.01); B05D 2202/10 (2013.01); C08K 3/36 (2013.01); C08K 2201/005 (2013.01)] 12 Claims
 
1. A solution composition for treating a surface of a steel sheet comprising:
15 to 50 wt % of colloidal silica;
20 to 60 wt % of alkoxy silane;
1 to 40 wt % of a solvent;
0.01 to 1.00 wt % of an acidity regulator;
5 to 15 wt % of an acrylate-based monomer;
0.1 to 3.0 wt % of a metal chelate curing agent; and
5 to 50 wt % of an adhesion improver including a backbone formed of siloxane bonds,
wherein the adhesion improver is a silicone resin,
wherein a ratio of silicon dioxide in the adhesion improver is 20 to 80 mol %, and
wherein a weight average molecular weight of the adhesion improver is 300 g/mol to 30,000 g/mol.