METHOD OF OBTAINING HARD FOAM POLYURETHANES Russian patent published in 2014 - IPC C08G18/36 C08G18/48 C08G18/50 C08G18/66 C08J9/04 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining hard foam polyurethanes. Method of obtaining hard foam polyurethanes is realised by interaction of: a) organic polyisocyanates b) with compounds, which contain at least two reactionable with respect to isocyantate groups hydrogen atoms, in presence of c) pore-formers, d) catalysts, as well as if necessary e) additional substances and additives, and as component b) applied is mixture, which contains: b1) from 20 to 70 wt.p. of one or several highly functional ethers of polyatomic alcohols with functionality from 3.7 to 5.2 and hydroxyl number from 370 to 500 mg KOH/g, b2) from 5 to 30 wt.p. of one or several ethers of polyatomic alcohols based on aromatic amines with functionality from 3 to 4 and hydroxyl number from 150 to 500 mg KOH/g, b3) from 5 to 20 wt.p. of one or several low molecular agents of chain elongation and/or linking agents with functionality from 2 to 3 and weight average molecular weight M_w less than 400 g/mole, average hydroxyl number of which constitutes from 400 to 500 mg KOH/g.

EFFECT: obtained hard foam polyurethanes are characterised by favourable surface properties.

6 cl, 1 tbl, 2 ex