Method of making paper having a high resin fill

Claim 1

In the method of making a resin-filled paper on a paper machine from an aqueous fiber slurry having a resin filler dispersed therein, said resin-filled paper having a resin content of from 20 to 100 percent, based on the weight of the fibers therein, the improvement which comprises employing, as the aqueous resin-filled fiber slurry, a slurry comprising A. 100 parts by weight of fibers comprising at least 30 percent by weight of natural cellulosic fibers; B. an aqueous dispersion of a non-ionic synthetic thermoplastic resin free of groups capable of thermal cross-linking and completely comprising neutral vinyl or vinylidene monomers which form salts neither in aqueous alkaline media nor in aqueous acid media, said dispersion comprising from 0.5 to 2.5 percent, by weight of the aqueous phase of said dispersion, of a cationic dispersing agent, and from 1 to 4 percent, by weight of the aqueous phase of said dispersion, of a non-ionic dispersing agent, the dry weight of resin in said dispersion being from 30 to 100 parts; and C. an amount of water such that the fiber content of the fiber slurry is between 0.5 and 1 percent.