| 摘要 |
PURPOSE:To obtain the titled molded article having high rigidity, excellent toughness and high burr strength in demolding, facilitating the cleaning of the mold, by using a crosslinking agent consisting of an aromatic polyamine alkylene oxide adduct having a specific structural formula and a low-molecular weight polyamine, etc. CONSTITUTION:The objective molded article can be produced by using a composition composed of (A) a compound of formula I (Z is aromatic polyamine residue; A is 2-4C alkylene; R is H or 1-4C alkyl; m is 0-4; n is 1-4; p is 2-4), (B) a low-molecular weight polyamine and, if necessary, (C) a low- molecular weight polyol as at least a part of crosslinking agent and reacting a polyisocyanate with a polymeric polyol in a mold in the presence of a catalyst, a foaming agent, etc., at need. The composition of the crosslinking agent is preferably 10-45% component A, 8-20% component B and <=25% component C based on the sum of the weight of the polymeric polyol and the crosslinking agent. The component A is preferably a compound of formula II (m', m'', n' and n'' are 1-4), etc.
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