Process for the preparation of polyol polymer dispersions
AssigneeBayer Antwerp N.V.
InventorsDonald W. Simroth, Xinhua Zhou, Charles V. Rose
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Abstract
Polymer polyols and polymer-modified polyols having substantially no transition metal content in the polyol continuous phase may be prepared from encapsulative double metal cyanide complex-catalyzed polyoxyalkylene polyether base polyols without substantial removal of double metal cyanide complex catalyst residues from the base polyol and subsequent in situ polymerization of one or more polymerizable monomers.
Claims8
A polyurethane foam prepared by reaction of one or more di- or polyisocyanates with a polyol component comprising a polyol polymer dispersion, in the presence of an effective amount of a blowing agent, said polyol polymer dispersion comprising a polyoxyalkylene polyol continuous phase and dispersed polymer phase prepared by in situ polymerization in said polyoxyalkylene polyol continuous phase, said polyoxyalkylene polyol continuous phase prior to said in situ polymerization comprising one or more oxypropylene moiety-containing polyoxyalkylene polyols prepared in the presence of an encapsulative double metal cyanide complex oxyalkylation catalyst and having transition metals from said encapsulative double metal cyanide contained therein, whereby the polyoxyalkylene continuous phase of said polyol polymer dispersion following in situ polymerization contains less than 40% of the content of transition metals which said continuous phase had prior to in situ polymerization, and the dispersed phase contains polymer particles associated with said transition metals.
A method for reducing the amount of catalyst required to prepare a polyurethane foam by the reaction of an isocyanate component with a polyol component in the presence of an effective amount of a blowing agent and one or more urethane reaction promoting catalysts, said method comprising employing as a said polyol component a polyol component comprising a polymer-modified polyol prepared by the in situ polymerization of one or more di- or polyisocyanates with one or more isocyanate-reactive monomers in a base polyol comprising an encapsulative double metal cyanide complex-catalyzed oxypropylene moiety-containing polyoxyalkylene polyether polyol, said polymer-modified polyol having a continuous phase containing said encapsulative double metal cyanide complex-catalyzed polyether polyol and a dispersed phase containing particles comprising an addition polymerization product of said one or more di- or polyisocyanates and said one or more isocyanate reactive monomers, said polymer-modified polyol containing about 4 ppm or more of transition metals derived from said encapsulative double metal cyanide complex, about 60% or more of said transition metals associated with said dispersed phase particles.
Dependencies are inferred from the claim text.