Catalyst compositions for making polyurethane based on imidazoles and boron compounds
AssigneeAir Products and Chemicals, Inc.
InventorsMark L. Listemann, Lisa A. Mercando, Ann C. L. Savoca
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Abstract
A method for catalyzing the blowing reaction and making polyurethane foams employing a catalyst composition consisting essentially of a hydroxy-functional imidazole of the following formula I ##STR1## where R.sup.1 is a C.sub.1 -C.sub.10 alkyl; R.sup.2 is hydrogen, methyl or ethyl and R.sup.3 is hydrogen or a C.sub.1 -C.sub.20 organic group optionally having an ether functionality, provided that when R.sup.1 is methyl, R.sup.2 and R.sup.3 are not both hydrogen or a hydrogen and a methyl, in combination with a boron compound of the formula R.sub.n B(OH).sub.3-n where n=0 or 1, and R=C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.8 cycloalkyl, or C.sub.6 -C.sub.10 aryl.
Claims13
In a method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of a blowing agent comprising water, a cell stabilizer and a catalyst composition, the improvement which comprises employing a catalyst composition consisting essentially of a hydroxy-functional imidazole of the following formula I ##STR4## where R.sup.1 is a C.sub.1 -C.sub.10 alkyl;
- R.sup.2 is hydrogen, methyl or ethyl and R.sup.3 is hydrogen or a C.sub.1 -C.sub.20 organic group optionally containing an ether group provided that when R.sup.1 is methyl, R.sup.2 and R.sup.3 are not both hydrogen or a hydrogen and a methyl, in combination with a boron compound of the formula
- R.sub.n B(OH).sub.3-n
- where n=0 or 1, and R=C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.8 cycloalkyl, or C.sub.6 -C.sub.10 aryl.
In a method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of a blowing agent comprising water, a cell stabilizer and a catalyst composition, the improvement which comprises employing a catalyst composition consisting essentially of a hydroxy-functional imidazole of the following formula I ##STR5## where R.sup.1 is methyl or ethyl;
- R.sup.2 is methyl and R.sup.3 is hydrogen or methyl, provided that when R.sup.1 is methyl, R.sup.3 is not hydrogen, in combination with boric acid.
Dependencies are inferred from the claim text.