PREPOLYMER OF DIISOCYANATES AND FORMAMIDE-TERMINATED OLIGOMERS, METHOD FOR PRODUCTION THEREOF AND USE THEREOF

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to novel prepolymers which are obtained from diisocyanates and formamide-terminated oligomers, as well as to use of said prepolymers. The prepolymers have the following general formula X-[-N(CHO)-CO-NH-R¹-NCO]_n (I), in which R¹ denotes an arylalkyl residue having 6-13 carbon atoms, or an alkylene residue having 4-13 carbon atoms, n equals an integer from 2 to 4, X denotes an n-valent organic residue, preferably a residue of formula Y-[-(CH₂-CHR³-(CH₂)_p-O)_m-CH₂-CHR⁴-(CH₂)_o-]_n- (II), in which Y denotes an n-functional, saturated residue having 2-6 carbon atoms, n assumes the value given above, R³ denotes hydrogen or methyl, R⁴ denotes hydrogen or methyl, m equals an integer from 2 to 30, o equals 0 or 1, p equals 0, 1 or 2. The obtained prepolymers are used to produce adhesives, lacquer, polyurethane moulded articles, polyurethane foam and sealants.;EFFECT: obtaining low-viscosity prepolymers.;3 cl, 1 tbl, 2 ex