Method For Suspension Polymerization Of Polyvinyl Chloride With The Creation Of A Catalyst Directly In The Reactor And Stabilizing-Suspending Agent Added Thereto For Said Reaction

A in situ process for production of polyvinyl chloride in a pressurized agitated reactor by means of polymerization of vinyl monomers in aqueous suspension comprising the steps of:

• adding at lest one vinyl monomer in aqueous solution into a pressurized agitated reactor;
• adding a stabilizing-suspending agent in hydroalcoholic suspension of an inorganic mineral powder having magnesium and hydroxylic groups to said reactor;
• adding,
• b1) a base;
• b2) a peroxide compound represented by A2O2 where A=H or Na;
• b3) a chloroformate represented by ClCOOR1;
• and
• b4) an organic acid anhydride represented by the general formula:
• (RCO)2O where R is an alkyl radical comprised between C=1 and C=20, to said reactor;
• adding aluminium with hydroxylic groups to said reactor;
• wherein in order to carry out the formation of the reaction catalyst in situ the separate addition of b1), b2), b3), b4), is performed only and exclusively within said reactor so that said catalyst is created gradually and under the control of the addition of said stabilising-suspending agent;
• and
• wherein said magnesium and hydroxylic groups of said stabilizing-suspending agent have a weight percentage between 4-12%, and
• said aluminium and hydroxylic groups have a weight percentage between 2-8%.