FINE PARTICLE, HIGH CONCENTRATION, POLYISOCYANATE POLYADDITION/POLYURETHANE-UREA POLYOLS

摘要

Embodiments of the invention include a method of producing polymer polyol dispersions is. The method includes providing at least one reaction system, and the reaction system includes:
a) at least one polyol,b) at least one seed population,c) at least one catalyst,
at least one co-reactant having an equivalent weight of up to 400 and at least one active hydrogen attached to a nitrogen or oxygen atom, ande) at least one polyisocyanate.

The at least one seed population includes less than about 5% by weight of the total weight of the at least one reaction system and includes seed particles having diameters of less than 5 μm. The at least one reaction mixture reacts to form at least one of a polyurea and polyurethane-urea particle population in the at least one polyol without the addition of any catalysts comprising tin. The polymer polyol dispersion has a solids content of at least 15% of the weight of the polymer polyol dispersion.