Abstract
Cationic copolymers for fixing perfluoroalkyl phosphate (Rf phosphoric ester) on pulp fiber are used to prepare water and oil resistant paper using internal sizing. Quaternary ammonium salts of vinyl monomers were synthesized by the Menschutkin reaction, 2-(diethylamino) ethyl methacrylate (DE) and 2-(dimethylamino) ethyl methacrylate (DM) as vinyl monomers reacted with quaternizing compounds (dimethyl sulfate, diethyl sulfate) to provide the corresponding quaternary ammonium salts of vinyl monomer. Quaternary ammonium salts and acrylamide (AAm) were copolymerized. The copolymer of diethyl(2-methacryloxyethyl)methyl ammonium methylsulphate(DE-DMS) [I] and acrylamide(AAm) at a molar ratio of 1.0/ 1.5 has been found to improve the oil and water resistance of paper using Rf phosphoric ester. Water and oil resistant paper using internal sizing may thus be obtained through use of cationic copolymer.
