WET-STRENGTHENED CARBOXYLATED CELLULOSIC MATERIALS CONTAINING MELAMINE FORMALDEHYDE RESIN AND A PROCESS FOR PREPARING THE SAME

摘要

A method of preparing fibrous cellulosic materials containing resins such as trimethylolmelamine so as to improve bonding between fibers and the wet state and conditioned state resistances, said method being one in which cellulose fibers are oxidized with an alkali metal periodate to form aldehyde groups in the 2 and 3 positions, and the aldehyde containing cellulose fibers are then further oxidized with an alkali metal chlorite to form carboxyl groups in the 2 and 3 positions, and the resin precursor is reacted in acidic medium and is mainly retained by an ion exchange mechanism on cellulose fibers, those fibers then being used on paper or cardboard machines; and the new products so obtained.