Patent ID: 8741274

Claim:
A process for the preparation of acrylic polymers beads comprising: (a) providing a monomer composition consisting of a mixture of 10-30 wt. % methacrylic acid (MAA), 35-65 wt. % n-butyl methacrylate (BMA), 5-15 wt. % ethylacrylate (EA) and 10-35 wt. % ethyl methacrylate (EMA), wherein the EMA and EA are present in amounts to achieve a coefficient of EMA to EA (w/w) in a range of 4 to 1, and (b) subjecting the monomer composition to suspension polymerization to obtain acrylic polymer beads having an average diameter of between 50 and 1500 μm and a residual monomer content of less than 250 ppm.