| 摘要 |
<p>This invention relates to the reaction products of butyrolactone and an aliphatic amine utilizable as a chain extender and curing agent for castable polyurethanes and to the process employing said products in preparing castable polyurethane elastomers and to the process for preparing the butyrolactone amine adducts. The aliphatic amine reactants employed in preparing the butyrolactoneamine adducts are defined by the formula: <IMAGE> wherein X is amino (-NH2) or hydroxy (-OH); R is hydrogen (-H) or methyl (-CH3) and n has a value of 1 to 2, which amines are reacted with butyrolactone in a mole ratio of between about 1:1 and about 1:3 to provide a curing agent having superior mechanical properties and having the formula: <IMAGE> wherein R is hydrogen or methyl, R' is a hydroxy group or <IMAGE> and n has a value of 1 or 2.</p> |
