METHOD OF PREPARATION OF POLYETHERURETHANE MODIFIER FOR NITROCELLULOSE PAINT MATERIALS Russian patent published in 1997 - IPC

FIELD: organic synthesis, more particularly synthesis of polyetherurethanes in organic solvents with controllable viscosity. SUBSTANCE: the modifier is 30-45 % solution of product of reaction of polyfurite with toluylene diisocyanate in butyl acetate. Reaction of reactive components is carried out at 110-125 C in butyl acetate containing at least 99% main agent. Total amount of polyfurite and diisocyanate is 70-85% by weight of the solution, and polymer chain growth is restricted by diluting the reaction mixture with butyl acetate containing 1 to 10 % monofunctional impurities formed during synthesis. EFFECT: more efficient preparation method. 1 tbl