| 摘要 |
There are disclosed storable, flowable, liquid polyurethane compositions comprising an equivalent of a prepolymer formed by reacting a liquid material having 2 to 3 hydroxyls with sufficient organic polyisocyanate to give an excess of 3 to 15 percent free NCS in said prepolymer and from 0.85 to 1.15 equivalents of a complex of alkali metal salt with 4,4'-diphenylmethane diamine, said polyurethane compositions being useful as gel coats and adhesives.
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