Removal of unreacted tolylene diisocyanate from urethane prepolymers
AssigneeW. R. Grace & Co.
InventorsNelson Samuel Marans, Alfred Gluecksmann
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Abstract
A process is described which is effective in removing unreacted tolylene diisocyanate (TDI) from a polyisocyanate by bringing said polyisocyanate into contact with molecular sieves.
Claims16
A method of reducing the residual unreacted tolylene diisocyanate content in the prepolymer reaction product of toluene diisocyanate with a polyoxyalkylene polyol comprising allowing said prepolymer to flow through a column packed with absorbent type X zeolite molecular sieves.
A method of reducing the residual unreacted tolylene diisocyanate content in the prepolymer reaction product of toluene diisocyanate with a polyoxyalkylene polyol comprising allowing said prepolymer to be mixed with absorbent type X zeolite molecular sieves.
A method of reducing the amount of unreacted monomeric isocyanate in a urethane prepolymer formed by reacting the hydroxyl groups of a polyoxyalkylene polyol with said monomeric isocyanate, said method comprising admixing said prepolymer with absorbent type X zeolite molecular sieves.
Dependencies are inferred from the claim text.