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Summary:PURPOSE:To produce titled molding having excellent spinnability, physical properties and elastic properties, by reacting specified polyurethane-forming materials and then melt-extruding the product into chips. CONSTITUTION:Into a reaction vessel equipped with an agitating means and a heating means are introduced (A) an organic diisocyanate such as 4,4'-diphenylmethane diisocyanate, (B) a polyol, MW700-3,000, such as polyethylene adipate and (C) a chain extender having at least two hydroxyl groups in the molecule, MW<=500, such as bis-beta-hydroxyethoxybenzene, so that the eq. ratio of isocyanato groups to hydroxyl groups is 1.00-1.10. The reaction mixture is then reacted at 60-150 deg.C for 10-100min, and removed from the system at the point when the reaction product is in a solid state and the isocyanato group content reaches 0.05- 0.20eq/kg. Then, this reaction product is melt-extruded at 230 deg.C or below into chips.
Bibliography:Application Number: JP19800014042