Patent ID: 7388056

Claim:
An improved process for the preparation of crosslinked polyallylamine polymer having particle size of 60 to 100 mesh which comprises partly neutralizing polyallylamine hydrochloride in the range of 58 to 90% with an alkali in an aqueous solution, chilling the above said solution to a temperature in the range of 4 to 10° C., adding a crosslinking agent to the above said chilled solution and dispersing the resultant mixture in an organic solvent containing a surfactant, under agitation, at a speed of 800 to 1200 rpm, allowing the reaction to occur initially at a temperature in the range of 25-30° C., for a period of about 10 minutes and further increasing the reaction temperature to a maximum of about 80° C. and allowing the reaction to continue for at least three hours, cooling the above said reaction mixture to a temperature in the range of 25-30° C., filtering the above said reaction mixture to separate the gel particles, washing the above said gel particles with water and finally with a water miscible organic solvent and removing the excess solvent followed by drying under vacuum to obtain the desired crosslinked polyallylamine polymer.