Patent ID: 6624271
Filing Date: 2003-09-23
Classification: C08F

Abstract:
A process for making a solution of an uncrosslinked copolymer of maleic anhydride (MA) and methyl vinyl ether (MVE) monomers having a specific viscosity (SV) of about 2.5-6 and a solids content of about 20-45%, in isopropyl acetate (IPAc) solvent, which comprises:(a) precharging part of MVE in IPAc into a reactor heated to about 50-90Â° C., (b) feeding (i) a solution of MA in IPAc, (ii) the rest of MVE, at a mole ratio of MA: MVE of 1:&gE;1.5 to 1:<3, and (iii) a free radical initiator dissolved in IPAc, in an amount of 0.02-0.3%, based on total monomers, into the reactor over time.