Procedure for preparing a block copolymer lioxialquilenglicol po. This Patent has been deposited in the following countries: Canada, Japan, and European Patent.

摘要

Procedure for obtaining a polioxialquilenglicol block copolymer of formula (i), where q is the organic waste of an aliphatic or Aromatic diisocyanate, R1 and R2 may be Hydrogen, Methyl, Ethyl, or mixtures thereof, R3 and R4 can be alquileno, arylene, alcarileno, aralqu So, cicloalquileno, heterocicloalquileno or mixtures thereof, X is an integer between 1 and 10,Y and Z are integers such that their sum is 1.5 to 2 vexes VALUE X and N, M, R and s are integers such that the N + M and R + S was between 8 and 250. Is based on making a Stoichiometric excess of a polioxialquilendiol of formula (ii) where r can be the same as R3 and R4 and N is an integer between 4 and 125, with an organic diisocyanate Molecular Weight 1.Approximately 500. The reaction is carried out with a strong agitation and temperature between 40 and 175 C.