METHOD FOR PREPARING STABLE POLYURETHANE SOLUTIONS

摘要

Method for producing a polyurethane solution which comprises mixing reactants of a prepolymer having terminal isocyanate groups a bifunctional chain-connecting agent having 2 hydrogen atoms capable of reacting with the isocyanate group and 0.5 - 10 mol percent of N,N-dialkylalkylene diamine per mol of the bifunctional chain connecting agent at room temperature and then subjecting the reaction mixture to heat-aging at a temperature of at least 70 DEG C for at least 5 hours.