Process for the preparation of polyurethane foams employing polyol dispersions containing polyisocyanate polyaddition solids
AssigneeBASF SE
InventorsSteven E. Wujcik, Donald L. Christman, Oscar M. Grace
Life of this patent
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Abstract
Addition of minor quantities of mono- or dicarboxylic acids to polyurethane foam formulations which employ polyisocyanate polyaddition polymer polyol dispersions prevents shrinkage and tightness in polyurethane foams prepared therefrom. If acid addition is made directly after dispersion preparation, reduction of polyol viscosity and more rapid stabilization against viscosity change is observed.
Claims24
A process for the preparation of polyurethane foams from polyisocyanate polyaddition polymer polyol dispersions containing as the dispersed phase polyisocyanate polyaddition polymers formed by the reaction of an organic polyisocyanate with itself or the reaction of an organic polyisocyanate with an active hydrogen compound, wherein the improvement comprises adding to the foam formulation ingredients from 0.01 to about 3 parts by weight based on the weight of the polyisocyanate polyaddition polyol polymer dispersion, of a mono- or dicarboxylic acid having the formula
- R--[COOH].sub.n
- where n is 1 or 2 and where R is a C.sub.1 -C.sub.18 alkyl group when n is 1 and R is a C.sub.1 -C.sub.18 alkylene group when n is 2.
A polyisocyanate polyaddition polymer polyol dispersion composition having enhanced processing latitude comprising:
- (a) a polyisocyanate polyaddition polymer dispersion in a polyol, wherein said polyisocyanate addition polymer is formed by the reaction of an organic polyisocyanate with itself or the reaction of an organic polyisocyanate with a reactive hydrogen compound;
- (b) from 0.01 to about 3 weight percent based on the weight or a) of a mono- or dicarboxylic acid having the formula:
- R--[COOH].sub.n
- wherein n is 1 or 2 and R is C.sub.1 -C.sub.18 alkyl when n is 1 and C.sub.1 -C.sub.18 alkylene when n is 2.
A process for reducing/stabilizing viscosity changes in polyisocyanate polyaddition polymer polyol dispersions wherein said polyisocyanate addition polymer is formed by the reaction of an organic polyisocyanate with itself or the reaction of an organic polyisocyanate with a reactive hydrogen compound, which dispersions are subject to post-preparation changes in viscosity, comprising adding thereto a viscosity reducing/stabilizing amount of from 0.01 to 3 weight percent based on the weight of the dispersion, of a mono- or dicarboxylic acid having the formula
- R--[COOH].sub.2
- where n is 1 or 2 and where R is C.sub.1 -C.sub.18 alkyl when n is 1 and C.sub.1 -C.sub.18 alkylene when n is 2.
Dependencies are inferred from the claim text.