Polyurethane foams prepared from alkyl dialkanol amine-containing polyols
AssigneeThe Dow Chemical Company
InventorJerram B. Nichols
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Abstract
Polyurethane foams are prepared by reacting a polyisocyanate and a polyahl in the presence of water and a dialkanol tertiary amine. The foams are rigid, useful for thermal insulation in roofs, walls, refrigerators, etc., and are capable of filling mold space completely on foaming (good flowability) without shrinking excessively.
Claims17
An active hydrogen containing composition comprising
- (a) at least one polyahl, which is not a dialkanol tertiary amine, having at least three active hydrogens per molecule
- (b) a minor amount of water, and
- (c) a dialkanol tertiary amine in an amount sufficient to improve the flowability of a foaming reaction mixture prepared from the active hydogen containing composition and a polyisocyanate from about 2 to about 40% compared to a like reaction mixture prepared in the absence of the dialkanol tertiary amine, wherein the isocyanate reactive materials in said active hydrogen containing composition have an average functionality of at least about 3.0.
In a process for preparing a polyurethane foam comprising reacting a polyahl and a polyisocyanate in the presence of water whereby a polyurethane foam is obtained, the improvement comprising conducting said reaction in the presence of a dialkanol tertiary amine in an amount sufficient to improve the flowability of the foaming reacting polyahl and polyisocyanat from about 2 to about 40% compared to a like reaction mixture prepared in the absence of the dialkanol tertiary amine, and wherein the average functionality of all isocyanate-reactive materials employed in said reaction is at least about 3.0.
Dependencies are inferred from the claim text.