PLEX POLYESTERPOLYOLS FOR OBTAINING HARD POLYURETHANES Russian patent published in 2018 - IPC C08G63/181 C08G63/66 C08G18/40 C08G18/42 C08L67/08 C08J9/06 

FIELD: chemistry.

SUBSTANCE: polyesterpolyol is described, obtained by reacting: b1) from 10 to 70 mol % of at least one compound selected from the group consisting of terephthalic acid, dimethyl terephthalate, polyethylene terephthalate, phthalic anhydride, phthalic acid, and isophthalic acid, b2) from 0.8 to 3.2 mol % of triglyceride fatty acid, b3) from 10 to 70 mol % of diol selected from the group consisting of ethylene glycol, diethylene glycol, and polyethylene glycol, and b4) from 5 to 50 mol % of polyetherpolyols with the functionality of more than 2 and a hydroxyl number of 150 to 1250 mg KOH/g obtained by the alkoxylation of ethylene oxide. At least 200 mmoles of the component b4) per kilogram of polyester polyol are used, and the sum of the components b1) to b4) is 100 mol %. A method is described for obtaining rigid foam polyurethane or rigid foam polyisocyanurates including the interaction of: A) at least one polyisocyanate, B) at least one of the above polyesterpolyols, C) optionally one or more other polyesterpolyols, different from the component C), D) optionally one or more polyetherpolyols, E) optionally one or more flame retardants, F) one or more blowing agents, G) one or more catalysts, and H) optionally other auxiliary components or additives. A rigid foam polyurethane obtained by the above method is described. The use of the above rigid foam polyurethanes for the manufacture of "sandwich" type elements with rigid or flexible coating layers is described. A polyol component is described for the preparation of rigid foam polyurethanes or rigid foam polyisocyanurates containing from 10 to 90 wt % of the above polyester polyol.

EFFECT: obtaining polyester polyol allowing to obtain rigid foam polyurethanes or foam polyisocyanurates with a reduced smoke formation and good surface quality.

18 cl, 2 tbl, 7 ex