Polyurethane elastomers having improved sag resistance
AssigneeJefferson Chemical Company, Inc.
InventorRichard Lee Rowton
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Abstract
The use of small amounts of an amine-terminated polyether in the B-component of a two-component polyurethane composition results in the immediate thickening of the A and B-components upon mixing to provide an elastomer precursor with improved sag resistance without substantially affecting the workability of the mixed components or the properties of the cured elastomer. These elastomers are useful as sealants, caulks and surface coatings.
Claims13
In a polyurethane elastomer composition prepared by admixing and reacting an organic polyisocyanate compound having free isocyanate moieties, a polyether polyol compound and a selected urethane catalyst, the improvement which comprises:
- adding to said admixture from about 1 to about 50 equivalents per 100 equivalents of said polyether polyol of a polyoxyalkylene polyamine of the formula:
- ##EQU1## wherein R is the nucleus of an oxyalkylation-susceptible saturated polyhydric alcohol containing 2 to 12 carbon atoms and 2 to 8 hydroxyl groups and R consists of hydrogen and carbon, Z is an alkyl group containing 1 to 18 carbon atoms, X and Y independently are hydrogen or Z, A is cyano-loweralkyl of 1 to 2 carbon atoms or hydrogen, n has an average value of 0 to 50 and m is an integer of 2 to 8 corresponding to the number of hydroxyl groups originally present in the polyhydric alcohol.
Dependencies are inferred from the claim text.