PROCESS FOR MAKING A SOLUTION OF COPOLYMERS OF MALEIC ANHYDRIDE AND ALKYL VINYL ETHER IN ISOPROPYL ACETATE OF HIGH SPECIFIC VISCOSITY AND AT A HIGH SOLIDS LEVEL

摘要

A process for making a solution of a copolymer of maleic anhydride (MA) and methyl vinyl ether (MVE) monomers the specific viscosity (SV) of the product being about 2.5-6 preferably 3-5, indicating a weight average molecular weight of substantially above one million, preferably above 1.5 million and a solids content of about 20-45% preferably 30-40, in isopropyl acetate (IPAc), solvent includes the steps of (a) precharging part of MVE in IPAc into a reactor heated to about 50-90°C, and then (b) feeding (i) a solution of MA in IPAc, (ii) the rest of MVE, at a mole ratio of MA:MVE of 1:≥1.5 to 1:3, preferably 1:2,4 and (iii) a free radical initiator dissolved in IPAc, in an amount of 0.02-0.3% preferably 0.05-0.2%, based on total monomers, into the reactor over time. Powders of such MA/MVE copolymers are made by removing the solvent from the solution.