METHOD OF PRODUCING LOW-HEAT CONDUCTIVITY RIGID POLYURETHANE FOAMS AND RIGID POLYURETHANE FOAMS OBTAINED BY THIS METHOD Russian patent published in 2003 - IPC

FIELD: polymer production. SUBSTANCE: rigid polyurethane foams are obtained by using (A) polyol component containing (i) at least one polyesterpolyol with molecular weight 100 to 30000 and containing at least two hydrogen atoms reactive toward isocyanates; (ii) aminoplyethers with molecular weight 250 to 12500 containing at least two hydrogen atoms reactive toward isocyanates and at least one tertiary nitrogen atom; (iii) polyethers with molecular weight 250 to 12500 containing at least two hydrogen atoms reactive toward isocyanates; and (iv) pore former (alkane or alkane mixture); and (B) organic and/or modified organic polyisocyanate with NCO group content 20 to 48 wt %. EFFECT: lowered heat conductivity and enabled use as interlayer between constituents of a hollow-filling material. 13 cl, 3 tbl, 11 ex _