NOVEL METHODS FOR SYNTHESIZING POLYVINYL AMINE (PVA) TYPE FLOCCULATING AND COAGULATING AGENTS, NOVEL AGENTS THUS OBTAINED, USES THEREOF AND IMPROVED PAPER TYPES THUS OBTAINED

摘要

The invention relates to a method for synthesizing polyvinylamine (PVA)- type polymers from a vinylformamide monomer at a low temperature. According to the invention, polymerization starts at 0 DEG C, is initiated by an original redox and azoic catalyst combination and is carried out at a substantially normal pressure.The polymerisation is conducted in water and is followed by direct hydrolysis. A cationic PVA is obtained directly in the form of a powder with a high molecular weight. It is also possible to operate with an emulsion at an initiation temperature of approximately 15 %. The PVA can be used as flocculating and coagulating agents in the paper industry, water treatment industry, oil industry, parapetrolic industry and the like.