The ornamental design for a syntheticresinpaper, as shown and described.
FIG. 1 is a front view of a synthetic resin paper.
FIG. 2 is a duplicate view of FIG. 1 showing the detail area of FIG. 3 within dot dash dot lines; and,
FIG. 3 is an enlarged detail of the synthetic resin paper shown within FIG. 2.
The dot dash dot lines represent the boundaries of the detail and form no part of the claim. The thickness and the bottom of the synthetic resin paper are not claimed.