US 12,246,985 B2
Scratch-resistant coating for glass ceramic cooktop
Margherita Basso, Scorzè (IT); Luigi De Nardo, Milan (IT); and Agnese D'Agostino, Gioia Sannitica (IT)
Assigned to WHIRLPOOL CORPORATION, Benton Harbor, MI (US)
Filed by Whirlpool EMEA S.p.A., Parma (IT)
Filed on Nov. 5, 2021, as Appl. No. 17/519,899.
Claims priority of application No. 102020000026557 (IT), filed on Nov. 6, 2020.
Prior Publication US 2022/0144696 A1, May 12, 2022
Int. Cl. C03C 17/00 (2006.01); C03C 10/00 (2006.01); C03C 17/22 (2006.01); C04B 35/58 (2006.01); C04B 35/581 (2006.01); C04B 35/622 (2006.01); C04B 35/624 (2006.01); C04B 35/626 (2006.01); C04B 35/632 (2006.01); C04B 35/64 (2006.01)
CPC C03C 17/225 (2013.01) [C03C 10/00 (2013.01); C04B 35/58035 (2013.01); C04B 35/581 (2013.01); C04B 35/62222 (2013.01); C04B 35/624 (2013.01); C04B 35/6264 (2013.01); C04B 35/632 (2013.01); C04B 35/64 (2013.01); C03C 2217/281 (2013.01); C03C 2217/29 (2013.01); C03C 2217/78 (2013.01); C03C 2218/113 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A sol coating for a cooking appliance comprising:
one or more metal precursors solubilized in a solvent with an overall concentration of 0.05 to 0.5 M, the one or more metal precursors comprises at least aluminum chloride; and
a nitrogen carrier,
wherein the one or more metal precursors and nitrogen carrier are taken under a continuous nitrogen flux at room temperature and wherein a molar ratio between the nitrogen carrier and the one or more metal precursors is between 0.5 to 5, and upon deposition of a layer of the sol coating having a thickness of 1-8 micrometers via screen-printing, or 100 to 200 nm via dip-coating or spray-coating, onto a cooking surface and curing, the sol coating has a scratch resistance of 10 to 16 N as based on pencil hardness.