Functionalized multistage polymer

PURPOSE: To prepare a polymer tack-free and improved in solvent resistance, water resistance, stain resistance, direct impact resistance and hot print resistance by containing a first stage polymer and a second stage polymer having α,β-unsaturated carbonyl functional groups. CONSTITUTION: A multistage latex polymer containing 20-70 wt.% of a first stage polymer containing 10 wt.% or above of a comonomer for an alternating bond and 80-30 wt.% of a second stage polymer having an acid functionality is produced. The acid functionality of the second stage polymer of this polymer is neutralized partially with a base, and then, at need, added with a quaternary ammonium phase transition catalyst, and reacted with a monoethylenically unsaturated epoxide compound to produce a radiation-curable latex polymer composition containing 20-70 wt.% of the first stage polymer and 80-30 wt.% of the second stage polymer having α,β-unsaturated carbonyl functional groups. COPYRIGHT: (C)1994,JPO