Patent ID: 9534145
Date: 2017-01-03
CPC Classifications: B05D,C01B,C08J,C09D,C23C

Claim:
1. A method for producing silicic dense film comprising: (1) a composition preparing step, in which a composition for a coating film comprising a polymer having a silazane bond and a solvent is prepared; (2) a coating step, in which a coated film is formed by coating said composition for a coating film on a substrate; (3) the first irradiating step, in which said coated film is irradiated with light having a maximal peak in the range of 160-179 nm wavelength; and (4) the second irradiating step, in which the coated film after the first irradiating step is irradiated with light having 10-70 nm wavelength longer maximal peak wavelength than the light used in the first irradiating step, and further wherein each irradiating step is carried out in an inert gas atmosphere where the oxygen concentration in said inert gas atmosphere is equal to or less than 100 ppm.