| abstract |
Polymeric substance (I)n n n 1) (a) 80 to almost 100 mole% C 1 -C 25 alkyl esters of α, β-unsaturated carboxylic acids,n n n (b) 0 to 20 mole% of other monomers,n n n (c) if necessary, tetrahydrofuran hydroperoxide as a polymerization initiator,n n n (d) polymer (II) comprising a polymerization initiator or regulator which terminates most of the polymer chain of polymer (II) at one end by a hydroxyl groupn n n 2) to provide reaction product (IV), the isocyanate group is reacted with polyfunctional isocyanate (II) having 1.2 to 3.0 moles per mole of hydroxyl group of polymer (II),n n n 3) Prepared by reacting product (IV) with compound (V) or ammonia having amino functional groups reactive to isocyanates.n n n The polymeric material can be used as a dispersion resin for the production of pigment-containing coatings, in particular magnetic recording materials. |