| 摘要 |
<p>Polyurethane-forming composition useful for backing textiles which comprises: (A) a first polyol which comprises a relatively high equivalent weight polyol containing an average of from 1.4 to 1.95 hydroxyl groups per molecule, of which at least 30 percent of the hydroxyl groups are primary hydroxyls or a mixture thereof with at least one additional relatively high equivalent weight polyol containing at least 2.05 hydroxyl groups per molecule, of which at least 30 percent of the hydroxyl groups are primary hydroxyls; (B) a relatively low equivalent weight compound having about 2 active hydrogen containing moieties per molecule; (C) a polyisocyanate and (D) a catalytic amount of a catalyst for the reaction of a polyol and a polyisocyanate, wherein the functionalities and proportions of components (A), (B), and (C) are such that the average functionality of the components together is from 1.97 to 2.03, and the composition has an isocyanate index of from 85 to 125. This invention is also a process for preparing a polyurethane-backed textile by coating the textile on one side with the above-described polyurethane-forming composition at a coating weight of from 1 to 300 ounces per square yard (0.03 to 10.2 kg/m2) and then heating the coated textile to a temperature of from 50 to 150oC until the polyurethane-forming composition is cured to a tack-free state.</p> |
