abstract |
One embodiment of the present invention is a method for producing a polyurethane foam, comprising 20 to 50% by weight of an N-substituted maleimide monomer, 20 to 50% by weight of a first aromatic vinyl monomer, 20 to 50% by weight of a second aromatic vinyl monomer, By weight, and an oligomer content of 2% by weight or less, and a process for producing the same. |