| abstract |
The invention relates to a method of preparation for polymers,nparticularly binders for powder coatings and powder coatings which are preparednas a solution in a supercritical fluid phase. Binders for powder coatings arenprepared from at least two ethylenically unsaturated monomers capable of free-radicalnor ionic copolymerisation, and conventional initiators and regulators innsupercritical fluids, whereby polymerisation is carried out in the homogeneousnphase, and, after the reaction has ended, either the composition or the phasenparameters of the mixture are altered so that at least two phases with supercriticalnfluid are obtained, and the phase containing predominantly polymer is separatednand the polymer is separated as a powder from the sc fluid by depressurisation ornthe polymer phase is further processed under supercritical phase conditions to thenpowder coating. |