Preparation of polyurethane foams
AssigneeBASF SE
InventorsPeter Horn, Werner Hinz, Ludwig Jung
Life of this patent
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Abstract
A process for the preparation of polyurethane foams, preferably semirigid polyurethane foams, having an improved foam structure involves reacting a) organic and/or modified organic polyisocyanates with b) polyhydroxyl compounds containing at least 2 reactive hydrogen atoms and c) crosslinking agents which comprise at least one polyoxyalkylene-polyol having a mean functionality of from 3 to 8 and a hydroxyl number of from 200 to 1300 ppm and a content of alkali metal ions of from 150 to 1200 ppm, in the presence of d) blowing agents, e) if desired catalysts, f) inorganic and/or organic acids as additives and g) if desired auxiliaries.
Claims43
A process for the preparation of polyurethane foams by reacting
- a) organic polyisocyanates with
- b) polyhydroxyl compounds containing at least 2 reactive hydrogen atoms and
- c) crosslinking agents, in the presence of
- d) blowing agents,
- e) optionally catalysts,
- f) additives and
- g) optionally auxiliaries,
- wherein the crosslinking agents (c) comprise at least one polyoxyalkylene-polyol having a functionality of from 3 to 8, a hydroxyl number of from 200 to 1300 and a content of alkali metal ions of from 150 to 1200 ppm, and the additive (f) comprises an inorganic and/or organic acid.
A polyurethane foam obtained by reacting
- a) organic polyisocyanates with
- b) polyhydroxyl compounds containing at least 2 reactive hydrogen atoms and
- c) crosslinking agents,
- in the presence of
- d) blowing agents,
- e) optionally catalysts,
- f) additives and,
- g) optionally auxiliaries,
- wherein the crosslinking agents (c) comprise at least one polyoxyalkylene-polyol having a functionality of from 3 to 8, a hydroxyl number of from 200 to 1300 and a content of alkali metal ions of from 150 to 1200 ppm, and the additive (f) comprises an inorganic and/or organic acid.
The polyurethane foam of 36, wherein the crosslinking agent (c) comprises at least one glycerol- and/or trimethylolpropane-initiated polyoxypropylene-, polyoxyethylene- or polyoxypropylene-polyoxyethylene-polyol having a hydroxyl number in the range from 210 to 970 and an alkali metal ion content of from 150 to 800 ppm.
Dependencies are inferred from the claim text.