Abstract: A process is, herein, disclosed for preparing a membrane used for prevention of short-circuiting between the anode and the cathode of a battery comprising contacting a polyethylene film with an aqueous solution of acrylic acid, water, ethylene dichloride and ferrous salt or cupric salt and irradiating with ionizing radiation to obtain a polyethylene film with acrylic acid molecules grafted uniformly thereon.

Abstract: This invention relates to a method for preparing paper board having excellent wet tensile strength and compression strength, which comprises (a) having paper board impregnated or coated with a mixture of an unsaturated vinyl ester prepolymer having a molecular weight of 300 to 3000 and having at least one hydroxyl group at the .beta.-position with respect to an ester bond in the molecule with at least one monomer selected from the group of methylacrylate, ethylacrylate and butylacrylate in a mixing weight ratio of 10:90-40:60, and (b) irradiating the paper board having the resinous mixture with electrons to cure the resinous mixture.

Abstract: Novel antiflaming fibers having excellent dyeability and heat resistance are prepared from a matrix-polymerized resin which comprises polymerizing acrylonitrile in the matrix of a vinyl chloride resin. A vinyl chloride resin and/or an acrylonitrile resin can be added in a specific amount to the matrix-polymerized resin when dissolved in a spinning solvent. Substantially the same fibers are also prepared from blended polymers which comprise blending a specific vinyl chloride resin and a specific acrylonitrile resin in the specific proportion, by employing the coagulation bath of an aqueous solution of calcium chloride.