Preparation of thermosetting resins and of pigmented compositions thereof for coating on paper

摘要

A thermosetting resin is prepared by mixing or reacting (a) an alkylene diamine or polyalkylenepolyamine with (b) an epihalohydrin (preferabiy chiorohydrin), and (Y) a watersoluble resin obtained by reacting(i) urea,(ii) a polyalkylenepolyamine, and(iii) a dibasic carboxylic acid (e.g. adipic)and reacting the resultant polyamidopolyurea (PAPU) formaldehyde.;The PAPU can be made by reacting (i) + (ii) and the product with (iii), or (ii) + (iii) and the product with (i), at specified reaction conditions.;(Y), (a) and (b) may all be reacted or mixed together, or first (Y) and (b) and then (a), or (a) and (b) then (Y).;The thermosetting resin is mixed into a paper coating composition including a conventional pigment, binder and water, and the composition is coated onto paper and dried to make a coated paper which has good waterresistance (due to the resin (Y)) whilst being receptive to rotary offset printing ink. ,