| abstract |
To provide a highly hard coating film formed on a substrate, as adhered to the surface of the substrate and having a refractive index of from 1.28 to 1.41 and a contact angle with water of from 90° to 115°. n A coating film having a refractive index of from 1.28 to 1.41 and a contact angle with water of from 90° to 115°, which is formed as adhered to a substrate surface by forming a reaction mixture comprising a silicon compound (A) of the formula Si(OR) 4 , a silicon compound (B) of the formula CF 3 (CF 2 ) n CH 2 CH 2 Si(OR 1 ) 3 , a silicon compound (C) of the formula H 2 NCOH(CH) m Si(OR 2 ) 3 , an alcohol (D) of the formula R 3 CH 2 OH and oxalic acid (E), in a specific ratio, heating this reaction mixture at a temperature of from 40 to 180° C. in the absence of water to form a solution of a polysiloxane, then applying a coating fluid comprising the polysiloxane solution on a substrate surface to form a coating, and heat-curing the coating at a temperature of from 40 to 450° C.; a process for forming such a coating film, and a process for producing such a coating fluid. |