PROCESS FOR PRODUCING RIGID POLYURETHANE FOAMS Russian patent published in 2016 - IPC C08J9/14 C08L75/08 C08G18/00 

FIELD: chemistry.

SUBSTANCE: invention is related to a method of producing rigid foamed polyurethanes by reacting a) organic polyisocyanates with b) compounds with at least two hydrogen atoms, reactive with respect to isocyanate groups, in the presence of with c) blowing, d) catalysts and if necessary, e) auxiliary ingredients and additives. As a component b) uses a mixture of b1) from 20 to 60 mass parts of one or more high-functional polyester polyols with functionality from 3.5 to 5.5 and hydroxyl number from 400 to 550 mg KOH/g, b2) from 5 to 15 mass parts of one or more polyester polyols based on aliphatic amines with functionality 4 and hydroxyl number from 470 to 800 mg KOH/g, b3) from 10 to 30 mass parts one or more polyester polyols and/or aromatic polyester polyols with functionality from 2 to 3 and hydroxyl number from 220 to 430 mg KOH/g, and b4) if necessary, from 1 to 5 mass parts of water.

EFFECT: polyol component b) used according to the invention has high stability during storage and the obtained rigid foamed polyurethanes are characterized by optimum surface properties, curing and adhesion.

6 cl, 1 tbl, 2 ex