FIELD: polymer production. SUBSTANCE: ε-caprolactam and a higher fatty acid are used as blocking agent for di- or polyisocyanate to give product, whose melt can be used to increase adhesion of rubbers to synthetic fibers. Reaction is conducted at 70-85 C for 30-60 min at weight ratio di- and polyisocyanate/caprolactam/fatty acid equal to (15-40):(12-80):(5-73). EFFECT: improved adhesion characteristics and lowered (by 20-70 C) dropping point. 1 tbl, 8 ex
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