A PROCESS FOR THE PREPARTION OF A PH RESPONSIVE POLYMER FOR COATING MICRO/MACRO CAPSULES

摘要

"A process for the preparation of a pH responsive polymer which can be used as a coating material for micro/macro capsules, particles intended for delivering drugs preferentially to the colon". This invention relates to a process for the preparation of a pH responsive polymer which can be used as a coating material for micro/macro capsules, particles intended for delivering drugs preferentially to the colon comprising dissolving monomers in a solvent system, as herein described to obtain a clear solution, flushing an inert gas through the said solution, adding an aqueous solution of an initiator, subjecting the solution to polymerization in presence of an inert gas till the polymerization is complete, purifying the said copolymer from the toxic monomers and other unreacted material by dialysis.