METHOD OF MANUFACTURING POLYURETHANE RESIN FOR BINDER OF MAGNETIC RECORDING MEDIA

摘要

The polyurethane resin binder is prepared by reacting organic diisocyanate(D) with diol mixture that contains 10-90wt% polycarbonate diol(A-1) of MW 500-3,000 synthesized from glycol and carbonate, 90-10wt% polyester diol of MW 500-5,000 synthesized from cyclic glycol and aliphatic secondary basic acid, diol(B) with COOX group(X is H2 or alkali metal atom), and short chain diol(C) with carbon no. of 2-10.