Reaktivsystemer og deres anvendelse til fremstilling af overtræk, klæbestoffer, tætningsmasser, stöbemasser eller formdele

摘要

A reactive system contains an organic polyamine and a polyisocyanate reversibly blocked with a hydrocarbon resin having phenolic OH groups. A reactive system (I) comprises (A) a polyisocyanate component consisting of at least an organic polyisocyanate with reversible blocked isocyanate groups; (B) an organic polyamine having at least two primary amine groups; and optionally (C) oxirane group containing compounds. (A) has a molecular weight of 168-25000 (excluding blocking agent) and its isocyanate groups are reversibly blocked with a hydrocarbon resin having phenolic OH groups.