ADDITION OF ORGANIC INITIATING AGENTS TO VINYL CHLORIDE MONOMER POLYMERIZATION REACTIONS DURING PROCESS OF PRESSURE DROP Russian patent published in 2006 - IPC C08F14/06 C08F114/06 C08F4/32 C08F4/38 

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to a method for polymerization of one or some monomers one of that is vinyl chloride monomer. Method involves addition of the standard system of organic peroxides to polymerization mixture in the first step of polymerization, and one or some of additional organic peroxides and, optionally, surfactant are added to the polymerization mixture at the reaction temperature value when pressure in the polymerization reactor falls due to depletion of vinyl chloride monomer amount. Indicated additional organic peroxides have half-time value less 1 h at the polymerization temperature under condition that formed polymer is not subjected for radio-frequency dielectric heating in the presence of additional organic peroxide. The proposed method provides decreasing the polymerization time owing to higher rate value of the pressure drop in the end the polymerization reaction. Also, invention provides the enhanced effectiveness of cooling capacity of polymerization solution.

EFFECT: improved effectiveness of polymerization process.

5 cl, 1 tbl, 1 ex