PREPOLYMER FROM DIISOCYANATES AND TERMINATED BY FORMAMIDE OLIGOMERS, THE METHOD OF ITS OBTAINING AND ITS APPLICATION

摘要

1. The prepolymer of diisocyanates and oligomers terminated with formamide. ! 2. A prepolymer according to claim 1 having the general formula I! ! wherein ! X is n-valent organic residue, preferably a residue of formula II! ! wherein ! Y is n-functional, saturated residue having from 2 to 6 carbon atoms! R1 is a residue arylalkyl having from 6 to 13 carbon atoms or an alkylene residue having from 4 to 13 carbon atoms! R3 is hydrogen or methyl,! R4 is hydrogen or methyl,! m is an integer from 2 to 30! n is an integer from 2 to 4! o is 0 or 1! p is 0, 1 or 2! 3. The prepolymer of the general formula 1 of claim 2! wherein ! R4 is methyl! o and p, respectively, is 0! 4. A process for preparing prepolymers according to claim 1, characterized in that the diisocyanates are reacted with the oligomers, terminated with formamide, and optionally present excess diisocyanate was separated by distillation. ! 5. The method claim 2 or 3, the prepolymer of formula (I), characterized in that the n- (n × 10) moles of diisocyanate of formula (III)! ,! wherein R1 and n are as defined in claim 1,! is reacted with one mole of the oligomers, terminated with formamide of the formula (IV)! ,! wherein X and n have the meaning as defined in claim 1,! and, if necessary, an excess of diisocyanate is present is separated by distillation. ! 6. Application of the prepolymers according to one of claims 1-3 for the preparation of adhesives, coatings, or molded articles of polyurethane foams poliuratanovyh or sealants. ! 7. The adhesive or sealant or varnish containing the prepolymer according to one of Claims 1-3.