Catalyst-solvent system for polyester-based polyurethane foams comprising N-butylmorpholine and N,N'-dimethylpiperazine and the solvent
AssigneeTexaco Inc.
InventorsGeorge P. Speranza, Robert L. Zimmerman
Life of this patent
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Abstract
N-butylmorpholine and N,N'-dimethylpiperazine may be used together as a catalyst system in an activator solution to give finer, more uniform cells to polyester-based polyurethane foams if a solvent is employed. It was surprisingly discovered that the components must be used together as a catalyst-solvent system to avoid the disadvantages observed when one of the components is changed or left out. For example, if the solvent were not present in the activator solution in proportions of at least 1 wt. %, the activator solution would not be homogeneous.
Claims20
A catalyst-solvent system for use in reacting an organic polyisocyanate with an organic polyester polyol to produce a polyurethane, the catalyst-solvent system comprising catalytic amounts N-butylmorpholine and N,N'-dimethylpiperazine and a solvent of the formula ##STR2## where n is zero or greater, m is 1 or greater, X and Y are hydrogen or lower alkyl axcept that X and Y cannot both be lower alkyl.
An activator solution for use in reacting with an organic polyisocyanate and an organic polyester polyol to produce a polyurethane, the activator solution comprising one or more surfactants, water, a solvent of the formula ##STR3## where n is zero or greater, m is 1 or greater, X and Y are hydrogen or lower alkyl except that X and Y cannot both be lower alkyl, and catalytic amounts of N-butylmorpholine and N,N'-dimethylpiperazine.
A method for producing a polyurethane which comprises reacting an organic polyisocyanate with an organic polyester polyol in the presence of a catalyst-solvent system comprising a catalytic amount of N-butylmorpholine, N,N'-dimethylpiperazine and a solvent of the formula ##STR4## where n is zero or greater, m is 1 or greater, X and Y are hydrogen or lower alkyl except that X and Y cannot both be lower alkyl.
A method for producing a polyurethane which comprises reacting an organic polyisocyanate with an organic polyester polyol in the presence of an activator solution comprising one or more surfactants, water, and a solvent of the formula ##STR5## where n is zero or greater, m is 1 or greater, X and Y are hydrogen or lower alkyl except that X and Y cannot both be lower alkyl and catalytic amounts of N-butylmorpholine and N,N'-dimethylpiperazine.
Dependencies are inferred from the claim text.