Coated paper suitable for stylus inscription and method of making the same

Claim 1

RECORDING MATERIAL SUITABLE FOR RECEIVING INSCRIPTIONS FROM A STYLUS COMPRISING A BACKING AN ADHERENT OBSCURING FILM COVERING ITS SURFACE WHICH FILM CONSISTS OF THERMOSPLASTIC RESINOUS MATERIAL AND HAS A THREE-DIMENSIONAL CELLULAR STRUCTURE INCLUDING A MULTIPLICITY OF DISCRETE MICROSCOPIC OR SUB-MICROSCOPIC ENCLOSED VOIDS BENEATH THE OUTER SURFACE THEREOF AND DISTRIBUTED THROUGHOUT THE VOLUME OF THE FILM IN A MAJOR PROPORTION OF ITS THICKNESS, THE RESINOUS FILM APART FROM SAID VOIDS THEREIN BEING SUBSTANTIALLY CONTINUOUS AND HOMOGENEOUS, THE FILM BEING NORMALLY OPAQUE THROUGHOUT ITS AREA BECAUSE OF ITS HETEROGENEOUS PHYSICAL STRUCTURE DUE TO THE INCLUSION OF SUCH VOIDS, BUT ADAPTED FOR LOCAL COALESCENCE UNDER THE STYLUS TO PERMIT RELEASE OF AIR FROM SAID VOIDS AND COLLAPSE THEREOF WITH RESULTANT PRODUCTION OF A HOMOGENEOUS, RELATIVELY TRANSPARENT AREA DISCLOSING THE UNDERLYING SURFACE.