PROCESS FOR PRODUCING POLYURETHANE ELASTOMER AND ELASTIC FILAMENT

摘要

A process for producing a polyurethane elastomer or elastic filament, wherein a first polymer diol of a molecular weight of at least 600, a second polymer diol of a molecular weight of at least 600, a first low-molecular weight diol having a molecular weight of not higher than 500, a second low-molecular weight diol, a first diisocyanate and a second diisocyanate are used as the main starting materials, and the molar ratio of the total of the first diisocyanate and the second diisocyanate in the starting materials to the total of the first polymer diol, the second polymer diol, the first low-molecular weight diol and the second low-molecular diol is 0.95/1 to 1.25/1, characterized in that a fluid polyurethane (obtained by continuously reacting a prepolymer having a terminal hydroxyl group and obtained by reacting the first polymer diol, the first low-molecular weight diol and the first diisocyanate with a prepolymer having a terminal isocyanate group and obtained by reacting the second polymer diol, the second low-molecular weight diol and the second diisocyanate) is continuously extruded through a nozzle.