FIELD: chemistry.
SUBSTANCE: prepolymer is obtained by reacting at least one isocyanate with at least one first compound and at least one second compound. The said first and second compounds each independently represents a monohydric alcohol, wherein the weight average molecular weight of the second compound is lower than that of the first. Isocyanate comprises methylene diphenyl diisocyanate.
EFFECT: isocyanate prepolymer has a reduced free monomer content while maintaining good processability due to low viscosity, and retained good mechanical properties of the prepolymer.
13 cl, 1 dwg, 6 tbl, 4 ex
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