Sulfur containing polyisocyanate polyaddition (PIPA) polyol with improved flame retardant properties and foams containing them

Abstract

The present invention provides a sulfur containing polyisocyanate polyaddition (PIPA) polyether polyol dispersion at a readily processible viscosity for use in making flexible polyurethane foams having inherent flame retardant properties that comprises a polyether polyol carrier and from 10 to 25 wt. %, based on the total weight of the dispersion, of particles of a sulfur containing polyisocyanate polyaddition (PIPA) polyether polyol having a particle size diameter (PSD), as determined by laser light scattering, of 90%, by volume, of the particles in the dispersion having a maximum PSD of from 0.2 to 4.5 μm and that, further, contain two or more aromatic carbamate groups. The dispersion may further comprise water or a blowing agent, g) one or more catalysts; and f) one or more polyisocyanates in a foam forming mixture. In addition, the present invention provides methods for making the sulfur containing PIPA polyether polyol dispersion comprising mixing polyol reactants under shear and delaying the addition of the sulfur containing polyol or extender reactant.

Dependencies are inferred from the claim text.