Nope, not useable for PCBs. Find yourself DTP studio nearby, they will happily make you laser exposed Ag film in resolution over 4800DPI for peanuts (I pay one nice "Thank You" or 1$ per A4 sheet of exposed and developed film). Only thing that differs from proffesional PCB manufacturing film matrices is the base used - don't rely on its longterm dimensional stability, otherwise it is just about the same.