Production of flameproofed, rigid, isocyanate-based foams
AssigneeBASF SE
InventorsUwe Keppeler, Werner Hinz, Michael Reichelt
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Abstract
The flameproofed, rigid, isocyanate-based foams, in particular rigid polyurethane and polyisocyanurate foams, are produced by reacting a) organic and/or modified organic polyisocyanates with b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired, c) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of d) blowing agents, e) catalysts, f) flameproofing agents, and, if desired, g) further auxiliaries and/or additives, wherein the flameproofing agent is a combination of at least one liquid flameproofing agent which is reactive toward isocyanates and at least one solid flameproofing agent.
Claims16
A process for the production of flameproofed, rigid, isocyanate-based foams, comprising reacting:
- a) organic and/or modified organic polyisocyanates with
- b) a compound containing at least two reactive hydrogen atoms, having a number average molecular weight of from 400 to 8000 and, optionally,
- c) chain extenders and/or crosslinking agents having a number average molecular weight of less than 400, in the presence of
- d) blowing agents,
- e) catalysts,
- f) flameproofing agents, and, optionally,
- g) further auxiliaries and/or additives,
- wherein the flameproofing agent comprises a liquid flameproofing agent which is reactive toward isocyanates and a solid flameproofing agent selected from the group consisting of ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogenphosphate and mixtures thereof, and wherein said liquid flameproofing agent is exclusive of components b) and c).
Dependencies are inferred from the claim text.