PROCESS FOR OBTAINING HYDROPHILIC POLYMERS AT A HIGH RATE OF DISSOLUTION OR SWELLING IN WATER

摘要

the invention relates to a process for the polymerization ofthe hydrophilic monomers in the presence of an inverse suspensionsurfactant which hydrolipophile balance between8 and 12, comprising a first step of polymerization withreverse phase and a second phase polymerisationreverse phase and a second phase in whicha second charge is introduced into the reactor, the monomerthe temperature of polymerization of the monomer. this processcan make come with volumetric ratiosthe aqueous phase to organic phase (raso), much higher than thebest classic "raso" processes (~ 0.6), practice0.6 to 1.2. the productivity is greatly improved withoutthe quality of the hydrophilic powder is to be altered.surprisingly, the morphology ".he final powder obtained is not at all affected by thespecific surface area is not reduced, and its distributionparticle size distribution is between 100 and 800 mm.