Process for preparing polyurethane resins colored with Anthraquinone colorants and products produced thereby.

摘要

A process for coloring polyurethane resins made by a polyaddition reaction of a polyol and an isocyanate is provided, which comprises adding to the reaction mixture before or during the polyaddition reaction a reactive coloring agent suitable for incorporation in the resin with the formation of covalent bonds, said coloring agent having the formula: in which R1 and R2 are independently selected from an alkyl group having from 1 to about 12 carbon atoms, X is --CH2--, a and a min are integers from 1 to about 6, and Y and Y min are independently selected from polymeric units of hydroxy alkylenes or alkylene oxide monomers selected from ethylene oxide, propylene oxide, butylene oxide, cyclohexene oxide, or glycidol, b and b min are independently either 0 or 1, and Z and Z min are reactive groups independently selected from -OH, -NH2, or -SH.