Abstract: A transparent material having an antireflective coating comprising at least two layers, an inner layer containing a compound of Ti, Al or Zi, and an outer layer containing an organic silicon compound. The thickness and refractive index of the layer (layer I) contiguous to the substrate and the thickness and refractive index of the outermost layer (layer O) satisfy the following requirements: ##EQU1## wherein n.sub.I is the refractive index of layer I, n.sub.O is the refractive index of layer O, d.sub.I is the film thickness (nm) of layer I, d.sub.O is the film thickness (nm) of layer O, l is a positive integer, m is an off positive integer and .lambda. is an optional standard wavelength (nm) selected within the visible ray wavelength region or in the vicinity thereof.

Abstract: An anti-fogging film derived from the curing of polyvinyl alcohol, finely divided silica and an organic silicon compound and a hydrolysate thereof which is capable of forming silanol by hydrolysis and having such a carbon/silicon element ratio that said ratio of the surface layer of the film is larger than that of the entire film, the production process thereof, and an article covered with said film are described. The above-mentioned film has an excellent anti-fogging property, surface hardness and good service durability.

Abstract: A coated plastic article having a good appearance, uniform dyeing and excellent surface properties comprises a shaped plastic substrate and a coating, said shaped plastic substrate comprising a polymer of diethylene glycol bisallyl carbonate, said shaped plastic substrate having at least one unsmooth portion on the surface thereof, said shaped plastic substrate being treated with activated gas, ionized radiation and/or active ray, and said coating on at least one surface of the shaped plastic substrate being dyeable or having permeability to dyes.

Abstract: A transparent shaped article having an enhanced anti-reflective effect is produced by treating with an activated gas the surface of a transparent shaped article having a surface layer containing a finely divided particulate inorganic substance having an average particle size of from about 1 to about 300 milli-microns. If desired, the transparent shaped article treated with the activated gas is coated with a protective coating material.