| 摘要 |
<p>Provided is an elastic strength improver used in polyurethane resin for synthetic leather, and represented by formula (1). [In the formula, X1 is a residual obtained by removing c active hydrogens from an m-valent active hydrogen-containing compound, c is an integer that satisfies 1 ? c ? m (where m is an integer from 1 to 20), X2 is a residual obtained by removing 1 active hydrogen from an active hydrogen-containing compound, Y is a residual obtained by removing all carboxyl groups from an aromatic carboxylic acid having a valency of 3 or more (the aromatic ring of Y is made up of carbon atoms, and these carbon atoms may have a substituent other than a carboxyl group and or a halogen atom bonded thereto, but at least one carbon atom does not have a substituent bonded thereto), a is an integer of 1 or more, b is an integer of 0 or more, and 2 ? a + b ?d-2 is satisfied (d is the number of hydrogen atoms that have bonded to carbon atoms that make up the aromatic ring, that is to say, the number of substitutable sites on the aromatic ring, in the event that all of the substituents including the carboxyl groups of the aromatic polycarboxylic acid are substituted with hydrogen atoms).]</p> |
