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It is the united form of alcohol with (-OH) and isocyante with isocyanate group(-NCO0 by the addition polymerization reaction.
 
Isocyanate type (OCN-R-NCO)
TDI, MDI, H12MDI, IPDI, HDI, MXDI, NBDI etc.

Polyoltype (HO-R'-OH)
Polyether: PPG, PEG, TMP, Glycerine, PTMG etc.
Polyester: PG, EG, DEG etc.
 
 
It is high molecular composite with urea combination in molecular structure.
It creates urea combination by doing addition polymerization reaction between (-NH2) with amine and isocyanate group(-NCO).
 
Isocyanatetype (OCN-R-NCO)
TDI, MDI, H12MDI, IPDI, HDI, MXDI, NBDI etc.

Aminetype (H2N-R'-NH2)
Jeffamine D-230, D-2000, T-5000
DETDA, Unilink 4200 etc.