Polymer polyols (PMPOs), processes for their production, and the use of such PMPOs, particularly in the production of flexible polyurethane foams. The PMPOs are produced using an ethylenically unsaturated composition that includes tertiary amino group-containing ethylenically unsaturated compound.

Polymer polyols (PMPOs), processes for their production, and the use of such PMPOs, particularly in the production of flexible polyurethane foams. The PMPOs are produced using an ethylenically unsaturated composition that includes an ethylenically unsaturated compound comprising a reaction product of: (i) an amino alkyl urea having a tertiary amino group and a primary amino group; and (ii) an ethylenically unsaturated compound comprising a primary amine-reactive group.