As the aldehyde, acid catalyst and terminator to be used for acetalization in the practice of the second aspect of the invention, there may be mentioned the same ones as those to be used in the practice of the first aspect of the invention. In the acetalization reaction, an antioxidant, ...
Thus, it is critical in the practice of the present invention that little or no water be present during the freeze-drying operation since this tends to vitiate the efficiency of the water removal treatment which must be effected solely or at least substantially by sublimation in order to ...
Also, in electrophotographic photosensitive elements having the aforesaid photosensitive layer, generally it is the practice to form a surface protective layer containing a resin as a film-forming or binding material on the photosensitive layer for improving the abrasion resistance of the photosensitive la...
In accordance with particularly preferred practice, the carrier is added to the aqueous medium in amounts sufficient to form a supersaturated solution, this being achieved by the addition of about 25-45% by weight of carrier to the aqueous medium. The use of supersaturating quantities of ...