| abstract |
An optically functional film provided at its outermost surface with an antifouling layer that simultaneously attains imperviousness to fingerprint, imperviousness to marking ink, slipperiness and water repellency. The optically functional film is one comprising a substratum, an optically functional layer superimposed on the substratum and an antifouling layer superimposed on the optically functional layer, wherein the antifouling layer exhibits element proportions of 0.25 to 1.0 Si/C, meaning a ratio of silicon element (Si) to carbon element (C), and 0.10 to 1.0 F/C, meaning a ratio of fluorine element (F) to carbon element (C), and the antifouling layer has the following properties: (a) liquid paraffin contact angle of 65° or greater and liquid paraffin fall angle of 15° or below, (b) black marking ink contact angle of 35° or greater and black marking ink fall angle of 15° or below, and (c) dynamic friction coefficient of below 0.15. |