Erasable dense paper and improved method of manufacturing

A process for manufacturing dense paper comprising the steps, performed in the following sequence, of:

• advancing a web of paper having a dry uncalendered density in a range of between about 7 to about 14 lbs./mil.;
• applying to the advancing web an aqueous dispersion containing a blend of a rigid polymeric material and an inorganic filler, said blend consisting essentially of from about 35 to about 90% of said polymeric material, from about 10 to about 65% of said inorganic filler, and an organic compound of tin in a range of about 0.10% to about 2.0%, said percentages being by weight based on the non-tin portion of the weight of the blend, said rigid polymeric material having a glass transition temperature in a range of between about 15 to about 60.degree. C.;
• removing the excess dispersion from said web;
• and
• heating said web after the excess dispersion has been removed to fuse said blend to said web so that the resulting paper comprises in a range of between about 8.5% to about 50%, by weight of the blend, said weight being based on the dry weight of the web.