| 摘要 |
PURPOSE:To make possible the formation of moldings which are improved in mold release characteristics, elasticity immediately after the mold release and suppressing voids and excellent in strength and heat resistance, by the reaction-injection molding of a mixture containing a liquid aromatic polyisocyanate, a long-chain molecule polyol, a specified aromatic polyamine as a chain-lengthening agent, a catalyst and other auxiliaries. CONSTITUTION:The title product is an elastic polyurethaneurea molding which is obtained by submitting a mixture containing the following ingredients a-e to a reaction-injection molding in a closed mold. (a) is an aromatic polyisocyanate which is liquid at room temperature, (b) is a long-chain molecule polyol having at least 50% of primary hydroxyl groups, (c) is an aromatic polyamine of formula 1 (where R is a methyl, ethyl, propyl or isopropyl group; X is an R or OR group; n is O or an integer of 1-3; and the molar ratio of R to OR is 5:95-60:40), (d) is a catalyst, and (e) includes a foaming agent, an internal mold release, a filler and other auxiliaries if necessary.
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