| 摘要 |
<p>PURPOSE:To obtain a titled sheet material which is inexpensive, has excellent durability, light shieldability to UV light for sensitization, etc. and is adequately used for sensitization of a PS plate by impregnating a paper base formed of pulp with a soln. contg. a specific material for preventing stretching and further latex. CONSTITUTION:A soln. of a material for preventing stretching consistinf of an acrylic resin, vinyl acetate/acryl vinyl acetate copolymer, etc. in a emulsion state or a soln. mixture composed of said soln. of the material for preventing stretching and a latex soln. of NBR, SBR, etc. is prepd. The resulted soln. is impregnated to a paper base consistig of pulp and having 70-180mum thickness so as to be incorporated at 95-70:5-30 by volume of the paper base. The paper base is then heated to dry or cure the resin by which the intended sheet material for a photosensitive mask is obtd. The resulted sheet material permits transmission of a part of visible rays and therefore positioning by using a light table is possible with said material.</p> |
