Unreacted monomer recover in production of vinyl ester copolymer with ethylene or ethylenically unsaturated monomer for aqueous dispersion or powder for e.g. coating or adhesive involves multistage fractional low temperature condensation

摘要

In the production of copolymers (I) containing vinyl ester and ethylene or ethylenically unsaturated monomers by aqueous, free-radical emulsion or suspension polymerization at 5-100 bar absolute, the pressure on the reaction mixture is reduced to 0.1-5 bar absolute after polymerization and the unreacted monomers are recovered from the residual gas by multistage fractional low temperature condensation.