Patent ID: 11878935
Assignee: CANON KABUSHIKI KAISHA
Field: Semiconductors (Electrical engineering)
Classification: CPC C  B  H | IPC B  C

Claim 0:
1. A method of coating a superstrate, comprising:
attaching a superstrate on a vacuum chuck, wherein the superstrate comprises a first surface and a second surface, the first surface and the second surface being opposite to each other, and the first surface directly facing the vacuum chuck;
applying on the second surface of the superstrate a liquid layer of a coating composition, the coating composition comprising a coating agent and a non-fluorinated solvent, wherein the non-fluorinated solvent has a boiling point of at least 165° C.; and
solidifying the coating composition to form a solid coating layer, wherein
a material of the superstrate has a thermal conductivity of not greater than 10 W/mK;
the vacuum chuck comprises ridges for applying a vacuum to the superstrate during coating; and
the solid coating layer obtained after solidifying comprises a smoothness value (SM) of not greater than 1%, the smoothness value being defined as SM=(CRD/CT)×100%, with CRD being a maximum roughness depth of the coating layer and CT being an average thickness of the coating layer over a length of 10 mm of the solid coating layer,

wherein the coating comprises at least one polymerizable polymer, at least one cross-linking agent, and a thermal acid generator.