| abstract |
【Task】 Provided is a flame retardant urethane resin exhibiting good flame retardancy. [Solution] Using tetramethylene glycol (PTG) or 3,3-dimethylol heptane (DMH) used as a chain extender in the main chain of the urethane resin, 2- (9,10-dihydro-, which is a phosphorus-containing dicarboxylic acid, is used. 9-Oxa-10-oxide-10-phosphaphenanthrene-10-yl) methylsuccinic acid (compound X) is esterified, and this is used as a phosphorus-containing chain extender, using a polyol, an isocyanate, and the phosphorus-containing chain extender. To make urethane resin. [Selection figure] None |