METHOD OF OBTAINING POLYESTER POLYOLS WITH SMALL AMOUNT OF DIOXANE WASTES Russian patent published in 2014 - IPC C08G63/12 C08G63/127 C08G63/16 C08G18/42 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to obtaining and application of polyester polyols. described is method of obtaining polyester polyols, in which : at stage a) mixed are at least, one anhydride of carboxylic acid (A), selected from group, consisting of phthalic anhydride, trimellitic acid anhydride and pyrromellitic acid anhydride, and diethyleneglycol (B), and subjected to interaction, with molar ratio of components (B) to (A) being within the range from 1.5:1.0 to 0.7:1.0; total content of components (A) and (B) counted per the weight of all mixture components is within the range from 66 to 90 wt %, and at stage b) diethyleneglycol (B) is added to polyester polyol from stage a), with polyester polyol from stage a) has higher molecular weight than polyester polyol from stage b), polyester polyol from stage a) has molecular weight in the range 1400 and 430 g/mol and hydroxyl number in the range between 80 and 260 mg KOH/kg, polyester polyol from stage b) has molecular weight in the range 750 and 350 g/mol and hydroxyl number in the range between 150 and 320 mg KOH/kg, and at stage a) added is, at least, one other glycol (C) with 2-4 carbon atoms except diethyleneglycol and, at least, one aliphatic dicarboxylic acid (D) with 5-12 carbon atoms, and number of components (C) and (D) at stage a) is selected such that quantity of components (A), (B), (C) and (D) in mixture constitutes 100 wt %. Also described is method of obtaining foam polyurethane (PUR) or foam polyisocyanurate (PIR) styrofoams, including stages: a) interaction of polyester polyol, obtained by claimed method, with b) polyisocyanate-containing component, c) foaming agent, d) one or several catalysts, e) if necessary, with fire retardant and/or other auxiliary substances and additives. Described is application of foam polyurethanes (PUR) or foam polyisocyanurates (PIR), obtained by said method for obtaining metal-containing laminated composite materials. Described is metal-containing laminated composite element, including metal layer and layer, containing PUR- or PIR-styrofoam, obtained by method described above.

EFFECT: reduction of quantity of formed dioxane relative to quantity of used diethyleneglycol, in the process of obtaining polyester polyols.

9 cl, 5 tbl, 18 ex