| 摘要 |
PURPOSE: Polyurethane composition is provided which has an excellent chlorine resistant property. CONSTITUTION: Polyurethane resin composition comprises 0.5- 10.0 weight % of a compound of formula 1, 2, 3. Thus, 518 g diphenylmethane-4,4'-diisocyanate and 2,300g polytetramethylene ether glycol are mixed at 45°C, reacted at 95°C for 90 minutes in a pipe reactor, followed by mixing with N,N'-dimethylacetamide. Obtained product is completely dissolved in 4,227 g DMF, followed by addition of chain extending agent and chain terminating agent. 4.5 Weight % of para-cresol and divinylbenzene, 3.5 weight % of polymer of bis(4-isocyanate cyclohexyl)methane and t-butylethanolamine, 3.5 weight % of oxidation preventing agent and 3 weight % of formula 4. Obtained polyurethane composition is spun at 250°C to give an elastic yarn. |
