of the paper prepared with these novel sizing agents may be obtained by curing the resulting webs sheets or molded products this curing process involves heating the paper at temperatures in the range of from 80 u00b0 to 150 u00b0 c for periods of from 1 to 60 minutes however it should again be noted that post curing is not essential to the successful operation of this invention the sizing agents of this invention may of course be successfully utilized for the sizing of paper prepared from all types of both cellulosic and combinations of cellulosic with non cellulosic fibers the cellulosic fibers which may be used include bleached and unbleached sulfate kraft bleached and unbleached sulfite bleached and unbleached soda neutral sulfite semi chemical chemiground wood ground wood and any combination of these fibers these designations refer to wood pulp fibers which have been prepared by means of a variety of processes which are used in the pulp and paper industry in addition synthetic fibers of the viscose rayon or regenerated cellulose type can also be used all types of pigments and fillers may be added to the paper which is to be sized with the novel sizing agents of.